Details of the Researcher

PHOTO

Koichi Chida
Section
International Research Institute of Disaster Science
Job title
Professor
Degree
  • 博士(障害科学) (Tohoku University)

  • 修士(障害科学) (Tohoku University)

Committee Memberships 8

  • 日本放射線技術学会 編集委員

    2007/04 - Present

  • 日本放射線技術学会 編集委員

    2007/04 - Present

  • 日本放射線技術学会 評議員

    2006/04 - Present

  • 日本放射線技術学会 評議員

    2006/04 - Present

  • American Journal of Roentgenology (American Roentgen Ray Society) 査読委員

    2005/03 - Present

  • American Journal of Roentgenology (American Roentgen Ray Society) 査読委員

    2005/03 - Present

  • 日本放射線技術学会 査読委員

    1995/04 - Present

  • 日本放射線技術学会 査読委員

    1995/04 - Present

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Professional Memberships 5

  • 日本放射線技術学会(2007/04- 編集委員)

  • American Journal of Roentgenology (American Roentgen Ray Society)(2005/03- 査読委員)

  • 日本放射線技術学会(1995/04- 査読委員)

  • 日本放射線技術学会(2006/04- 評議員)

  • 日本放射線技術学会(2003/04- 日本放射線技術学会計測分科会委員)

Research Interests 7

  • Radiation Disaster Medicine

  • QC

  • MRS

  • Digital Imaging

  • Exposure

  • Radiation

  • Radiography

Research Areas 4

  • Life sciences / Radiology / Radiological Technology

  • Life sciences / Internal medicine - General / Internal Medicine and Disability Prevention

  • Life sciences / Biomaterials / Magnetic Resonance Spectroscopy

  • Life sciences / Biomedical engineering / Magnetic Resonance Spectroscopy

Awards 13

  1. 研究会奨励賞

    2026/03 「環境放射能」研究会 航空機モニタリングデータを取り入れた野生ニホンザルの外部被ばく線量評価(ポスター)

  2. 研究会奨励賞

    2026/03 「環境放射能」研究会 環境レベルに近づけた低濃度トリチウム水の持続曝露による細胞影響解析(口頭)

  3. Radiographer EPOS (Poster) Awards: Cum Laude

    2026/03 European Congress of Radiology (ECR) 2026 Analysis of Peak Skin Dose in Neuroendovascular Therapy of Unruptured Aneurysms

  4. 研究奨励賞

    2025/12 日本放射線安全管理学会 X線透視下での気管支鏡検査における医師の水晶体被ばくの評価

  5. 優秀演題発表賞

    2025/10 日本放射線影響学会 Dynamics of co-localized foci of phosphorylated H2AX and 53BP1 induced by ionizing radiation

  6. RSNA2012 Exhibit Award "CERTIFICATE of MERIT"

    2012/11 Radiological Society of North America (RSNA)

  7. RSNA2011 Exhibit Award "CERTIFICATE of MERIT"

    2011/12 Radiological Society of North America (RSNA)

  8. 平成22年度放射線影響研究奨励賞

    2011/03/16 (財)放射線影響協会 「IVR放射線被曝評価とその防護に関する研究」について活発な研究活動を行い、この分野の発展に寄与した。

  9. RSNA2008 Exhibit Award "CERTIFICATE of MERIT"

    2008/12 Radiological Society of North America (RSNA)

  10. 平成18年度日本放射線技術学会研究奨励賞

    2007/01/20 (社)日本放射線技術学会

  11. RSNA2005 Exhibit Award CERTIFICATE of MERIT

    2005/12 Radiological Society of North America

  12. RSNA2003 Exhibit Award CERTIFICATE of MERIT

    2003/12/03 Radiological Society of North America

  13. Kurokawa cancer research foundation

    2003/06/24 (財)宮城県対がん協会

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Papers 386

  1. Performance evaluation of personal dosimeter D-Shuttle for use by residents in the event of a nuclear accident Peer-reviewed

    Ayano Akisawa, Eishin Sasaki, Hirotaka Yonenaga, Kanata Izumi, Yuki Okabe, Yohei Inaba, Koichi Chida

    Radiation Physics and Chemistry 239 113323-113323 2026/02

    Publisher: Elsevier BV

    DOI: 10.1016/j.radphyschem.2025.113323  

    ISSN: 0969-806X

  2. Pediatric dental cone-beam computed tomography using half-acquisition and low-noise reconstruction: visual evaluation of clinical images. International-journal Peer-reviewed

    Misaki Ito, Ikuho Kojima, Masahiro Iikubo, Shu Onodera, Masahiro Sai, Masaki Fujisawa, Toshiki Kato, Masaaki Nakamura, Masayuki Zuguchi, Koichi Chida

    Physical and engineering sciences in medicine 2026/01/08

    DOI: 10.1007/s13246-025-01691-2  

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    This study evaluated whether half-acquisition (180° scan) pediatric cone-beam computed tomography (CBCT; 3D Accuitomo F17, J. Morita, Kyoto, Japan) reduces radiation exposure while maintaining sufficient diagnostic image quality for identifying ectopic eruptions and impacted teeth. Additionally, it was investigated whether a low-noise reconstruction filter (G_101) mitigates image quality degradation in 180° scans. Three board-certified oral and maxillofacial radiologists certified by the Japanese Society for Oral and Maxillofacial Radiology visually evaluated clinical images from 12 pediatric patients (aged 6-10 years). The image quality was objectively assessed using phantom-based analyses of the modulation transfer function (MTF), noise power spectrum (NPS), and comprehensive objective image quality calculated from MTF and NPS values. Although 180° images showed increased noise and slightly lower visual assessment scores compared with 360° images, they remained diagnostically acceptable. In 180° reconstructions, the median visual scores with the G_101 filter were slightly higher than those with the standard G_001 filter, with small differences (within approximately 0-3 points on a 100-point scale), although the differences were not statistically significant. Interestingly, in approximately 28% of 180 evaluations, 180° images scored higher than 360° images, likely due to reduced motion artefacts from shorter acquisition. In a previous phantom experiment, the dose area product (DAP) for 360° and 180° scans was 490 mGy cm2 and 249 mGy cm2, respectively, indicating that 180° scan reduces radiation exposure while maintaining clinically acceptable image quality. These findings suggest that half-acquisition, when combined with an appropriate reconstruction filter, may offer a practical, low-dose alternative for pediatric dental imaging.

  3. Development and Performance Evaluation of a Novel Mobile X-ray System for Use in Disaster Situations. Peer-reviewed

    Masaki Fujisawa, Yohei Inaba, Toshiki Kato, Masatoshi Suzuki, Koichi Chida

    The Tohoku journal of experimental medicine 267 (3) 345-355 2025/12/05

    DOI: 10.1620/tjem.2025.J054  

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    Mobile radiography is useful for triaging patients during disasters. However, in the face of large-scale disasters, medical equipment, including X-ray systems, may be restricted because of power outages. Therefore, a novel mobile radiography system that can be used in any disaster was developed, and its basic performance was evaluated. This system is designed for use during power outages and can be recharged using both household and solar power sources. The reproducibility of the X-ray output of the system (irradiation dose, tube voltage, radiation quality and irradiation time) was excellent, confirming that radiography could be performed consistently. The entrance surface dose and scattered radiation during chest radiography were measured using a chest phantom. Both results were acceptable, verifying that the system is sufficiently safe from the viewpoint of radiation protection. This novel mobile radiology system is easy to carry and can generate solar power, making it useful during a power outage in the case of a large-scale disaster or when examinations need to be performed outside a hospital, such as at a first-aid station.

  4. 低濃度持続処理によるヒト細胞内へのトリチウムの取り込み・局在とDNA二重鎖切断誘発との関連性 Peer-reviewed

    和泉哉汰, 磯部理央, 佐藤拓, 山下琢磨, 木野康志, 福本学, 鈴木正敏, 千田浩一

    Proceedings of the 26th Workshop on Environmental Radioactivity 89-94 2025/12

  5. Shortened Acquisition Duration for Brain Tumor 11C-Methionine Positron Emission Tomography on Silicon Photomultiplier Positron Emission Tomography/Computed Tomography Peer-reviewed

    Takato Inomata, Kaoru Sato, Masanobu Ibaraki, Mamoru Kominami, Yuki Shinohara, Fumiko Kinoshita, Hiroyuki Yamamoto, Mamoru Kato, Toshibumi Kinoshita, Koichi Chida

    Applied Sciences 15 (22) 12292-12292 2025/11/19

    Publisher: MDPI AG

    DOI: 10.3390/app152212292  

    eISSN: 2076-3417

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    Positron emission tomography/computed tomography (PET/CT) scanners equipped with silicon photomultiplier detectors offer superior sensitivity and count-rate performance. The aim of this study was to evaluate the feasibility and impact of shortening the acquisition duration in brain tumor 11C-methionine PET using a silicon photomultiplier PET/CT system, and to assess how point spread function (PSF) correction influences quantitative values. In the phantom study, a brain tumor phantom was scanned using the Biograph Vision silicon photomultiplier-based PET/CT system. Data were acquired for 10, 5, 3, and 1 min, and the images were reconstructed with and without PSF correction. In the clinical study, 20 patients who underwent 11C-methionine PET were retrospectively analyzed. PET data were acquired over 10 min and subsequently reconstructed for 10, 5, and 3 min. We evaluated quantitative parameters including the maximum standardized uptake value (SUVmax), and their relative errors under shortened acquisition durations were analyzed. In the phantom study, the SUVmax increased with shorter acquisition durations; however, this increase was less pronounced with PSF correction. In the clinical study, relative errors of SUVmax for the 5 and 3 min acquisitions with PSF correction were 2.9 ± 3.8% and 5.2 ± 5.4%, respectively. They were smaller than those without PSF correction (5.5 ± 5.1% and 12.7 ± 8.5%), indicating superior quantitative stability with shortened acquisition duration. The combination of the Biograph Vision system and PSF correction enabled the acquisition of high-quality PET images with shortened scan times.

  6. Impact of Physician Height and Experience on Eye Lens Dose in Interventional Cardiology: An Initial Study Peer-reviewed

    Kodai Sagehashi, Yoshihiro Haga, Toshiki Kato, Saki Takahira, Masahiro Sota, Yuji Kaga, Mitsuya Abe, Norio Tada, Koichi Chida

    Applied Sciences 15 (22) 12137-12137 2025/11/15

    Publisher: MDPI AG

    DOI: 10.3390/app152212137  

    eISSN: 2076-3417

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    In 2011, the International Commission on Radiological Protection (ICRP) recommended reducing the annual equivalent dose limit to the eye lens. This study investigated the effects of physician height and years of experience on lens radiation exposure in a clinical setting. The lens dose was measured using the DOSIRIS dosimeter, which quantified Hp(3) while accounting for the shielding effect of lead glasses, and a neck dosimeter for Hp(0.07). A significant negative correlation was found between physician height and both Hp(0.07) (R = −0.642) and Hp(3) (R = −0.728), suggesting that taller physicians received lower lens doses because of their greater distance from the scatter source. A positive correlation was observed between years of experience and Hp(0.07) (R = 0.650). Two-group comparisons showed that physicians shorter than 170 cm had a 2.77-fold higher median Hp(3) than those ≥170 cm (p < 0.05). As experienced physicians may be exposed to higher radiation levels, regular review of protective practices and continued radiation safety education are essential, regardless of clinical experience. This is the first clinical study to simultaneously evaluate the effects of physician height and experience on lens dose in interventional cardiology. Regular review of protective practices remains essential regardless of operator height or experience.

  7. Breast Organ Dose and Radiation Exposure Reduction in Full-Spine Radiography: A Phantom Model Using PCXMC Peer-reviewed

    Manami Nemoto, Koichi Chida

    Diagnostics 15 (21) 2787-2787 2025/11/03

    Publisher: MDPI AG

    DOI: 10.3390/diagnostics15212787  

    eISSN: 2075-4418

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    Background/Objectives: Full-spine radiography is frequently performed from childhood to adulthood, raising concerns about radiation-induced breast cancer risk. To assess such probabilistic risks as cancer, accurate estimation of equivalent and effective organ doses is essential. The purpose of this study is to investigate X-ray imaging conditions for radiation reduction based on breast organ dose and to evaluate the accuracy of simulation software for dose calculation. Methods: Breast organ doses from full-spine radiography were calculated using the Monte Carlo-based dose calculation software PCXMC. Breast organ doses were estimated under various technical conditions of full-spine radiography (tube voltage, distance, grid presence, and beam projection). Dose reduction methods were explored, and variations in dose and error due to phantom characteristics and photon history number were evaluated. Results: Among the X-ray conditions, the greatest radiation reduction effect was achieved by changing the imaging direction. Changing from the anteroposterior to posteroanterior direction reduced doses by approximately 76.7% to 89.1% (127.8–326.7 μGy) in children and 80.4% to 91.1% (411.3–911.1 μGy) in adults. In addition, the study highlighted how phantom characteristics and the number of photon histories influence estimated doses and calculation error, with approximately 2 × 106 photon histories recommended to achieve a standard error ≤ 2%. Conclusions: Modifying radiographic conditions is effective for reducing breast radiation exposure in patients with scoliosis. Furthermore, to ensure the accuracy of dose calculation software, the number of photon histories must be adjusted under certain conditions and used while verifying the standard error. This study demonstrates how technical modifications, projection selection, and phantom characteristics influence breast radiation exposure, thereby supporting the need for patient-tailored imaging strategies that minimize radiation risk while maintaining diagnostic validity. The findings may be useful in informing radiographic protocols and the development of safer imaging guidelines for both pediatric and adult patients undergoing spinal examinations.

  8. Estimation of Physicians’ Radiation Eye Dose during Interventional Hepatology Procedures Peer-reviewed

    Hirotaka Yonenaga, Yoshihiro Haga, Eishin Sasaki, Ayano Akisawa, Masaki Fujisawa, Masahiro Sota, Toshiki Kato, Mitsuya Abe, Yuji Kaga, Yohei Inaba, Koichi Chida

    Japanese Journal of Radiological Technology 81 (11) n/a-n/a 2025/11

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.25-1610  

    ISSN: 0369-4305

    eISSN: 1881-4883

  9. Real-Time Monitoring of Occupational Radiation Exposure in Nuclear Medicine Technologists: An Initial Study Peer-reviewed

    Masaki Fujisawa, Masahiro Sota, Yoshihiro Haga, Shigehisa Tanaka, Nozomi Kataoka, Toshiki Kato, Yuji Kaga, Mitsuya Abe, Masatoshi Suzuki, Yohei Inaba, Koichi Chida

    Applied Sciences 15 (20) 11008-11008 2025/10/14

    Publisher: MDPI AG

    DOI: 10.3390/app152011008  

    eISSN: 2076-3417

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    Occupational radiation exposure in nuclear medicine presents complex spatial and temporal patterns due to the use of unsealed radiopharmaceuticals and prolonged proximity to patients. Traditional passive dosimetry provides only cumulative dose values, limiting its usefulness in identifying task-specific exposures or capturing momentary fluctuations. This study applied a real-time dosimetry system capable of second-by-second measurements, combined with time-series analysis, to evaluate staff exposure during myocardial perfusion imaging using technetium-99m. Dosimeters were placed on the left and right sides of the neck and head of two radiological technologists. Dose rates were continuously recorded throughout the injection and imaging phases. The right side of the neck received the highest cumulative and peak dose rates among all sites. Although no significant difference in total dose was observed between the injection and imaging phases, specific high-exposure events were detected. Notably, ECG lead placement and post-injection handling produced dose spikes. A positive correlation was found between administered activity and dose rate at neck-level sites but not at head-level sites. These findings demonstrate the value of real-time dosimetry in identifying procedural actions associated with elevated exposure. Time-series analysis further contextualized these peaks, supporting improved task-specific protective strategies beyond the capabilities of conventional dosimetry.

  10. Reducing Radiation Dose in Computed Tomography Imaging of Adolescent Idiopathic Scoliosis Using Spectral Shaping Technique with Tin Filter Peer-reviewed

    Yoshiyuki Noto, Tatsuya Kuramoto, Kei Watanabe, Koichi Chida

    Tomography 11 (10) 110-110 2025/09/29

    Publisher: MDPI AG

    DOI: 10.3390/tomography11100110  

    eISSN: 2379-139X

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    Background/Objectives: Children with adolescent idiopathic scoliosis (AIS) require repeated imaging, primarily standing spine radiography, while CT may be required for surgical planning, resulting in higher radiation exposure. Spectral shaping using a tin filter can reduce radiation dose in non-contrast chest CT. This study evaluated the efficacy of spectral shaping using a tin filter for reducing radiation dose in CT imaging in AIS and its impact on image quality. Methods: We retrospectively analyzed 51 AIS patients who underwent spine CT between February 2017 and March 2022, and divided them into two groups: normal-dose CT (NDCT) and low-dose CT with spectral shaping with a tin filter (LDCT). Radiation doses and image quality were compared between the groups. Radiation dose was recorded as the volume CT dose index (CTDIvol) and the dose length product emitted from the device, and effective and equivalent doses obtained from simulations. Results: The use of spectral shaping with a tin filter resulted in a 75% reduction in radiation dose compared to conventional CT without any reduction in image quality. Conclusions: Spectral shaping CT with a tin filter can substantially reduce radiation dose while maintaining image quality. It may be considered a safer alternative to conventional CT when clinically indicated in AIS patients.

  11. Evaluation of radiation protection by lead glasses for interventional radiology physicians wearing prescription glasses: considering dose reduction by prescription glasses excluding lead. International-journal Peer-reviewed

    Ryota Shindo, Keisuke Yamamoto, Saya Ohno, Satoe Konta, Yohei Inaba, Masatoshi Suzuki, Masayuki Zuguchi, Koichi Chida

    Journal of radiation research 66 (5) 486-495 2025/09/23

    DOI: 10.1093/jrr/rraf047  

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    The International Commission on Radiological Protection has reduced the occupational eye lens dose limit to 20 mSv/year. Interventional radiology (IR) physicians are frequently exposed to high levels of scattered X-rays, and radiation protection tools, including lead glasses, are used for minimizing exposure. However, the effectiveness of lead eyewear for radiation workers who wear prescription glasses (e.g. over-glasses-type eyewear) has not been comprehensively investigated. This study evaluated the shielding effectiveness of over-glasses-type eyewear worn over plastic prescription glasses through phantom experiments. Furthermore, the dose reduction provided by the plastic lenses and front frame of the prescription glasses (excluding lead) was assessed. The over-glasses-type eyewear demonstrated high shielding effectiveness, with average shielding rates of 0.72-0.74 and 0.74-0.80 for the left and right eyes, respectively, against radiation incident from the lower left oblique, as typically encountered in clinical settings. In contrast, the plastic lenses of prescription glasses provided <9% dose reduction when it irradiated with 80- and 120-kV X-rays, indicating minimal contribution to eye protection. The plastic front frame offered a 14% reduction at 80 kV and 11% at 120 kV. These findings suggest that the front frame of the prescription glasses contributes to photon attenuation and improves overall shielding. However, the improper fit of over-glasses-type eyewear may lead to gaps, compromising its shielding effectiveness. To minimize gaps and optimize protection, IR physicians should select over-glasses-type eyewear that fits securely over prescription glasses. Additionally, combining protective tools is essential for effective eye protection.

  12. Fundamental study of digital subtraction angiography using dose characteristic analysis of different protocols in lower limb arterial disease Peer-reviewed

    Kazuya Kakuta, Koichi Chida, Masamichi Naruse, Shumpei Nemoto, Masamitsu Ikeda, Arifumi Hasegawa

    FUKUSHIMA JOURNAL OF MEDICAL SCIENCE 2025/09

    Publisher: The Fukushima Society of Medical Science

    DOI: 10.5387/fms.25-00015  

    ISSN: 0016-2590

    eISSN: 2185-4610

  13. 【被ばく線量管理と防護の今!2025】新型鉛フリー放射線防護眼鏡の開発

    進藤 僚太, 藤沢 昌輝, 下橋 航大, 稲葉 洋平, 千田 浩一

    Rad Fan 23 (10) 36-39 2025/09

    Publisher: (株)メディカルアイ

    ISSN: 1348-3498

  14. Analysis of CT Hounsfield units for fetal imaging: Basic data for creating dosimetry phantoms of pregnant women Peer-reviewed

    Yuta Matsunaga, Masanao Kobayashi, Shoichi Suzuki, Yasuki Asada, Koichi Chida

    Physica Medica 135 105021-105021 2025/07

    Publisher: Elsevier BV

    DOI: 10.1016/j.ejmp.2025.105021  

    ISSN: 1120-1797

  15. Assessment of lens absorbed dose by radiological technologists during mobile X-ray radiography: a comparison between computed radiography and flat panel detector systems Peer-reviewed

    Satoe Konta, Saya Ohno, Ryota Shindo, Keisuke Yamamoto, Yoshihiro Haga, Toshiki Kato, Masahiro Sota, Yuji Kaga, Mitsuya Abe, Koichi Chida

    Radiological Physics and Technology 18 (3) 766-774 2025/06/24

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1007/s12194-025-00930-1  

    ISSN: 1865-0333

    eISSN: 1865-0341

  16. Development of a headgear-based eye protection device for physicians performing fluoroscopy-guided bronchoscopy. International-journal Peer-reviewed

    Masaki Fujisawa, Yoshihiro Haga, Saki Takahira, Masahiro Sota, Toshiki Kato, Mitsuya Abe, Yuji Kaga, Yohei Inaba, Masatoshi Suzuki, Koichi Chida

    Journal of radiation research 66 (4) 372-384 2025/06/18

    DOI: 10.1093/jrr/rraf031  

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    Fluoroscopy-guided bronchoscopy is an essential tool for diagnosing and treating lung diseases, particularly lung cancer. However, prolonged fluoroscopic exposure raises concerns regarding radiation-induced lens injuries in physicians, such as radiation cataracts. In response to the International Commission on Radiological Protection lowering the occupational lens dose limit to an average of 20 mSv/year over 5 years, there is an increasing need for effective lens protection during such procedures. This study has aimed to develop a novel lens protection device specifically designed for bronchoscopy physicians and evaluate its protective performance through a phantom study. The device consisted of a 0.175 mm lead (Pb) sheet positioned on the left side of the physician's head, secured with headgear to improve stability and comfort during prolonged use. A phantom study was conducted using a trunk phantom to simulate a patient and a head phantom to simulate a physician. The scattered radiation doses were measured at 15 locations on the phantom head using a radiophotoluminescence glass dosimeter, both with and without a protective device. The device demonstrated a protective effect of more than 80% for the left eye across all tested angles, whereas the right eye showed protection ranging from approximately 40% to 75% depending on the angle. This novel lens protection device has the potential to significantly reduce scattered radiation to the left eye while minimizing vision obstruction and discomfort. This offers a practical solution for radiation protection during bronchoscopy and may be applicable to other interventional procedures requiring fluoroscopic guidance.

  17. 避難退域時検査時に指定箇所の体表面汚染検査を行う装置の基礎検討 Peer-reviewed

    中村 美緒, 田辺 真子, 佐藤 拓, 下橋 航大, 高平 咲希, 阿部 喜弘, 越智 隆浩, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 24 (1) 2-9 2025/06

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

    eISSN: 1884-9512

  18. 福島第一原発事故に被災した野生ニホンザルの外部被ばく評価と血漿における酸化ス トレス状態解析 Peer-reviewed

    佐藤拓, 石川諒椰, 和泉哉汰, 尾田晃平, 林哲平, 長原辰弥, 山下琢磨, 木野康志, 遠藤暁, 鈴木敏彦, 篠田壽, 福本学, 鈴木正敏, 千田浩一

    KEK-proceedings 2025 (2) 95-100 2025/02

  19. 診断領域のエネルギーのX線に対する視力矯正眼鏡による遮蔽効果 Peer-reviewed

    進藤 僚太, 山本 啓介, 大野 紗耶, 今田 聡恵, 稲葉 洋平, 洞口 正之, 千田 浩一

    日本放射線安全管理学会誌 25 (1) 2025/01

  20. Establishment of acquired radioresistant cells to fractionated radiation from hTERT-immortalized normal human epithelial cell

    Masatoshi Suzuki, Rio Isobe, Taku Sato, Ryoya Ishikawa, Keiji Suzuki, Yasushi Kino, Tomisato Miura, Yohei Inaba, Koichi Chida, Manabu Fukumoto

    Radiation Protection Dosimetry 200 (16-18) 1636-1640 2024/11/01

    DOI: 10.1093/rpd/ncae118  

    ISSN: 0144-8420

    eISSN: 1742-3406

  21. Analysis of cellular effects by continuous exposure AT low concentration of tritium

    Rio Isobe, Masatoshi Suzuki, Satoru Endo, Yasushi Kino, Ryoya Ishikawa, Yohei Inaba, Manabu Fukumoto, Koichi Chida

    Radiation Protection Dosimetry 200 (16-18) 1631-1635 2024/11/01

    DOI: 10.1093/rpd/ncae112  

    ISSN: 0144-8420

    eISSN: 1742-3406

  22. Radiation Exposure to the Brains of Interventional Radiology Staff: A Phantom Study

    Saya Ohno, Ryota Shindo, Satoe Konta, Keisuke Yamamoto, Yohei Inaba, Koichi Chida

    Bioengineering 11 (11) 2024/11

    DOI: 10.3390/bioengineering11111083  

    eISSN: 2306-5354

  23. Effects of Different Fields of View and Rotation Angles on Radiation Doses to Highly Radiosensitive Organs in Children Using Dental Cone Beam Computed Tomography

    Misaki Ito, Ikuho Kojima, Masahiro Iikubo, Shu Onodera, Masahiro Sai, Masaki Fujisawa, Toshiki Kato, Masaaki Nakamura, Masayuki Zuguchi, Koichi Chida

    Applied Sciences 2024/10/09

    DOI: 10.3390/app14199154  

  24. Radiation dose to the eye of physicians during radio frequency catheter ablation: a small-scale study. International-journal

    Yoshiaki Morishima, Koichi Chida, Hiroo Chiba, Koji Kumagai

    Irish journal of medical science 2024/10/05

    DOI: 10.1007/s11845-024-03802-6  

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    BACKGROUND: Radio frequency catheter ablation (RFCA), a treatment for arrhythmia, requires a long fluoroscopy time that increases the radiation exposure dose to the physician, particularly to the lens of the eye. It is recommended that a lens-specific dosimeter such as DOSIRIS® is used to measure the dose to the lens. AIMS: In this study, we investigated whether conventional glass badges can be used as an alternative to lens dosimeters. METHODS: The doses to the lenses of two physicians (physician A, main operator; physician B, assistant; physician B was further away from the patient than physician A) were measured for 126 RFCA procedures performed over a 6-month period (fluoroscopy rate of 3.0 p/s with use of a ceiling-hanging shield). RESULTS: The cumulative value measured by a lens dosimeter attached to the inside of Pb glasses (0.07-mm dose equivalent) next to the left eye was 4.7 mSv for physician A, and 0.8 mSv for physician B. The reading on the glass badge worn on the left side of the neck was 4.7 mSv for physician A and 1.3 mSv for physician B. Lens dosimeter and glass badge values showed a good correlation for the left eye and left neck (r = 0.86, p < 0.01). CONCLUSIONS: We show that glass badges may be a viable alternative to lens-equivalent dosimetry when using low-pulse fluoroscopy and a ceiling-hanging shield.

  25. Comparison of radiation-shielding curtains for endoscopic retrograde cholangiopancreatography staff. International-journal

    Hiroki Ishii, Koichi Chida, Yohei Inaba, Shu Onodera, Masahiro Sai, Masayuki Zuguchi

    Journal of radiological protection : official journal of the Society for Radiological Protection 2024/09/12

    DOI: 10.1088/1361-6498/ad7a06  

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    Occupational radiation exposure to the eye lens of medical staff during endoscopic retrograde cholangiopancreatography (ERCP) should be kept low so as not to exceed annual dose limits. Dose should be low to avoid tissue reactions and minimizing stochastic effects. It is known that the head and neck of the staff are exposed to more scattered radiation in an over-couch tube system than in a C-arm system (under-couch tube). However, this is only true when radiation-shielding curtains are not used. This study aimed to compare the protection radiation to the occupationally exposed worker between a lead curtain mounted on a C-arm system and an ERCP-specific lead curtain mounted on an over-couch tube system. A phantom study simulating a typical setting for ERCP procedures was conducted, and the scattered radiation dose at four staff positions were measured. It was found that scattered radiation doses were higher in the C-arm with a lead curtain than in the over-couch tube with an ERCP-specific lead curtain at all positions measured in this study. It was concluded that the over-couch tube system with an ERCP-specific lead curtain would reduce the staff eye dose by less than one-third compared to the C-arm system with a lead curtain. For the C-arm system, it is necessary to consider more effective radiation protection measures for the upper body of the staff, such as a ceiling-suspended lead screen or another novel shielding that do not interfere with procedures.

  26. Radiation dose analysis in interventional neuroradiology of unruptured aneurysm cases

    Satoru Kawauchi, Koichi Chida, Takashi Moritake, Yusuke Hamada, Wataro Tsuruta

    Journal of Radiological Protection 44 (3) 031515-031515 2024/09/01

    Publisher: IOP Publishing

    DOI: 10.1088/1361-6498/ad76b3  

    ISSN: 0952-4746

    eISSN: 1361-6498

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    Abstract This study aimed to evaluate the radiation doses (peak skin dose (PSD) and bilateral lens dose) for each interventional neuroradiology procedure. A direct measurement system consisting of small radiophotoluminescence glass dosimeter chips and a dosimetry cap made of thin stretchable polyester was used for radiation dosimetry. The mean PSDs for each procedure were 1565 ± 590 mGy (simple technique coil embolization (STCE) cases), 1851 ± 825 mGy (balloon-assisted coil embolization (BACE) cases), 2583 ± 967 mGy (stent-assisted coil embolization (SACE) cases), 1690 ± 597 mGy (simple flow-diverter stenting (FDS) cases), and 2214 ± 726 mGy (FDS + coiling cases). The mean PSD was higher in SACE cases than in STCE, BACE, and simple FDS cases. Moreover, the PSD exceeded 2000 mGy and 3000 mGy in 46 (67.6%) and 19 (27.9%) SACE cases, respectively. The left lens doses for each procedure were 126 ± 111 mGy (STCE cases), 163 ± 152 mGy (BACE cases), 184 ± 148 mGy (SACE cases), 144 ± 60 mGy (simple FDS cases), and 242 ± 178 mGy (FDS + coiling cases). The left lens dose in SACE cases was higher than that in STCE cases and exceeded 500 mGy in 3 (4.4%) patients. In FDS + coiling cases, the mean PSD and left lens dose were 2214 ± 726 mGy and 242 ± 178 mGy, respectively. The left lens dose was higher than that in the STCE and BACE cases, with two (15.4%) patients receiving doses &gt;500 mGy in FDS + coiling cases. The detailed data obtained in this study are expected to contribute to the promotion of radiation dose optimization.

  27. Effect of backscatter radiation on the occupational eye-lens dose

    Saya Ohno, Satoe Konta, Ryota Shindo, Keisuke Yamamoto, Rio Isobe, Yohei Inaba, Masatoshi Suzuki, Masayuki Zuguchi, Koichi Chida

    Journal of Radiation Research 65 (4) 450-458 2024/07/01

    DOI: 10.1093/jrr/rrae034  

    ISSN: 0449-3060

    eISSN: 1349-9157

  28. Evaluation of Radiation Doses Received by Physicians during Permanent 198Au Grain Implant Brachytherapy for Oral Cancer

    Yohei Inaba, Keiichi Jingu, Masaki Fujisawa, Kazuki Otomo, Hiroki Ishii, Toshiki Kato, Yuuki Murabayashi, Masatoshi Suzuki, Masayuki Zuguchi, Koichi Chida

    Applied Sciences (Switzerland) 14 (14) 2024/07

    DOI: 10.3390/app14146010  

    eISSN: 2076-3417

  29. Comparison of shielding effects of over-glasses-type and regular eyewear in terms of occupational eye dose reduction. International-journal

    Ryota Shindo, Saya Ohno, Keisuke Yamamoto, Satoe Konta, Yohei Inaba, Masatoshi Suzuki, Masayuki Zuguchi, Koichi Chida

    Journal of radiological protection : official journal of the Society for Radiological Protection 44 (2) 2024/05/17

    DOI: 10.1088/1361-6498/ad4714  

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    Given the new recommendations for occupational eye lens doses, various lead glasses have been used to reduce irradiation of interventional radiologists. However, the protection afforded by lead glasses over prescription glasses (thus over-glasses-type eyewear) has not been considered in detail. We used a phantom to compare the protective effects of such eyewear and regular eyewear of 0.07 mm lead-equivalent thickness. The shielding rates behind the eyewear and on the surface of the left eye of an anthropomorphic phantom were calculated. The left eye of the phantom was irradiated at various angles and the shielding effects were evaluated. We measured the radiation dose to the left side of the phantom using RPLDs attached to the left eye and to the surface/back of the left eyewear. Over-glasses-type eyewear afforded good protection against x-rays from the left and below; the average shielding rates on the surface of the left eye ranged from 0.70-0.72. In clinical settings, scattered radiation is incident on physicians' eyes from the left and below, and through any gap in lead glasses. Over-glasses-type eyewear afforded better protection than regular eyewear of the same lead-equivalent thickness at the irradiation angles of concern in clinical settings. Although clinical evaluation is needed, we suggest over-glasses-type Pb eyewear even for physicians who do not wear prescription glasses.

  30. Cアーム式透視装置を用いたERCP従事者のための放射線防護衝立の開発

    石井 浩生, 稲葉 洋平, 千田 浩一, 小野寺 崇, 斎 政博

    日本放射線技術学会総会学術大会予稿集 80回 197-198 2024/03

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  31. シンチレーションサーベイメータの温度補償機能の有無による温度依存性

    古川 未来, 礒部 理央, 大野 紗耶, 郷内 優作, 進藤 僚太, 山本 啓介, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 80 (3) 279-286 2024/03

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  32. Cアーム式透視装置を用いたERCP従事者のための放射線防護衝立の開発

    石井 浩生, 稲葉 洋平, 千田 浩一, 小野寺 崇, 斎 政博

    日本放射線技術学会総会学術大会予稿集 80回 197-198 2024/03

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  33. オーバーグラスタイプ防護眼鏡の放射線防護効果に関する検討 矯正眼鏡による遮蔽効果について

    進藤 僚太, 大野 紗耶, 今田 聡恵, 礒部 理央, 山本 啓介, 郷内 優作, 古川 未来, 芳賀 喜裕, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北支部雑誌 (33) np161-np162 2024/02

    Publisher: (公社)日本放射線技術学会-東北支部

  34. Erratum: Evaluation of radiation dose and image quality for dental cone-beam computed tomography in pediatric patients (2023J. Radiol. Prot.43 031518). International-journal

    Misaki Ito, Koichi Chida, Shu Onodera, Ikuho Kojima, Masahiro Iikubo, Toshiki Kato, Masaki Fujisawa, Masayuki Zuguchi

    Journal of radiological protection : official journal of the Society for Radiological Protection 43 (4) 2023/12/29

    DOI: 10.1088/1361-6498/ad1744  

  35. Fundamental study on diagnostic reference level quantities for endoscopic retrograde cholangiopancreatography using a C-arm fluoroscopy system. International-journal

    Hiroki Ishii, Koichi Chida, Yohei Inaba, Keisuke Abe, Shu Onodera, Masayuki Zuguchi

    Journal of radiological protection : official journal of the Society for Radiological Protection 2023/11/08

    DOI: 10.1088/1361-6498/ad0a9d  

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    The diagnostic reference level (DRL) is an effective tool for optimizing protection in medical exposures to patients. However, regarding air kerma at the patient entrance reference point (Ka,r), one of the DRL quantities for endoscopic retrograde cholangiopancreatography (ERCP), manufacturers use a variety of the International Electrotechnical Commission (IEC) and their own specific definitions of the reference point. The research question for this study was whetherKa,ris appropriate as a DRL quantity for ERCP. The purpose of this study was to evaluate the difference betweenKa,rand air kerma incident on the patient's skin surface (Ka,e) at the different height of the patient couch for a C-arm system. Fluoroscopy and radiography were performed using a C-arm system (Ultimax-i, Canon Medical Systems, Japan) and a over-table tube system (CUREVISTA Open, Fujifilm Healthcare, Japan).Ka,ewas measured by an ion chamber placed on the entrance surface of the phantom. Kerma-area product (PKA) andKa,rwere measured by a built-inPKAmeter and displayed on the fluoroscopy system.Ka,edecreased whileKa,rincreased as the patient couch moved away from the focal spot. The uncertainty of theKa,e/Ka,rratio due to the different height of the patient couch was estimated to be 75-94%.Ka,rmay not accurately representKa,e.PKAwas a robust DRL quantity that was independent of the patient couch height. We cautioned against optimizing patient doses in ERCP with DRLs set in terms ofKa,rwithout considering the patient couch height of the C-arm system. Therefore, we recommend thatKa,ris an inappropriate DRL quantity in ERCP using the C-arm system.

  36. シンチレータ式簡易測定器の諸特性に関する基礎検討

    礒部 理央, 古川 未来, 大野 紗耶, 進藤 遼太, 山本 啓介, 稲葉 洋平, 鈴木 正敏, 千田 浩一

    日本放射線安全管理学会誌 22 (2) 72-82 2023/11

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

  37. シンチレータ式簡易測定器の諸特性に関する基礎検討

    礒部 理央, 古川 未来, 大野 紗耶, 進藤 遼太, 山本 啓介, 稲葉 洋平, 鈴木 正敏, 千田 浩一

    日本放射線安全管理学会誌 22 (2) 72-82 2023/11

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

  38. Internal organ dose rate conversion coefficients of Japanese macaques to 134Cs,137Cs and 131I†. International-journal

    Yuta Takamura, Tsuyoshi Kajimoto, Kenichi Tanaka, Tomoya Yamamoto, Masatoshi Suzuki, Yohei Inaba, Koichi Chida, Manabu Fukumoto, Chary Rangacharyulu, Satoru Endo

    Journal of radiation research 64 (5) 804-810 2023/09/22

    DOI: 10.1093/jrr/rrad055  

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    The purpose of this study was to estimate the internal dose of radiation in Japanese macaques (aka Nihonzaru or snow monkey) due to the Fukushima nuclear power plant accident. Images of a male Japanese macaque weighing ~10 kg were acquired using a multi-slice computed tomography (CT) scan with a 64-row segment detector. The CT images were used to create voxel phantoms of the bones, bone marrow, brain, eyes, heart, lungs, stomach, liver, spleen, pancreas, kidneys, intestines, bladder, testes, thyroid and miscellaneous tissue. The Particle and Heavy Ion Transport System (PHITS) Monte Carlo code was used to calculate the internal exposure rate conversion factors for 134Cs, 137Cs and 131I isotopes for the created voxel phantoms with a statistical precision higher than 1%. The PHITS-calculated energy deposits were compared with those for rhesus monkeys. The results showed that the fractions of energy deposits for β-radiation in different organs were almost identical between the two species. For γ-radiation, there was excellent agreement in the self-absorption rate with the approximate curve of the Japanese macaque, with an average deviation of 2%. The maximum deviation of 12% was for the kidney, which has two organs, so the error with the approximate curve is slightly larger due to the energy loss created between organs.

  39. Eye Lens Radiation Dose to Nurses during Cardiac Interventional Radiology: An Initial Study. International-journal

    Ayumi Yamada, Yoshihiro Haga, Masahiro Sota, Mitsuya Abe, Yuji Kaga, Yohei Inaba, Masatoshi Suzuki, Norio Tada, Masayuki Zuguchi, Koichi Chida

    Diagnostics (Basel, Switzerland) 13 (18) 2023/09/20

    DOI: 10.3390/diagnostics13183003  

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    Although interventional radiology (IVR) is preferred over surgical procedures because it is less invasive, it results in increased radiation exposure due to long fluoroscopy times and the need for frequent imaging. Nurses engaged in cardiac IVR receive the highest lens radiation doses among medical workers, after physicians. Hence, it is important to measure the lens exposure of IVR nurses accurately. Very few studies have evaluated IVR nurse lens doses using direct dosimeters. This study was conducted using direct eye dosimeters to determine the occupational eye dose of nurses engaged in cardiac IVR, and to identify simple and accurate methods to evaluate the lens dose received by nurses. Over 6 months, in a catheterization laboratory, we measured the occupational dose to the eyes (3 mm dose equivalent) and neck (0.07 mm dose equivalent) of nurses on the right and left sides. We investigated the relationship between lens and neck doses, and found a significant correlation. Hence, it may be possible to estimate the lens dose from the neck badge dose. We also evaluated the appropriate position (left or right) of eye dosimeters for IVR nurses. Although there was little difference between the mean doses to the right and left eyes, that to the right eye was slightly higher. In addition, we investigated whether it is possible to estimate doses received by IVR nurses from patient dose parameters. There were significant correlations between the measured doses to the neck and lens, and the patient dose parameters (fluoroscopy time and air kerma), implying that these parameters could be used to estimate the lens dose. However, it may be difficult to determine the lens dose of IVR nurses accurately from neck badges or patient dose parameters because of variation in the behaviors of nurses and the procedure type. Therefore, neck doses and patient dose parameters do not correlate well with the radiation eye doses of individual IVR nurses measured by personal eye dosimeters. For IVR nurses with higher eye doses, more accurate measurement of the radiation doses is required. We recommend that a lens dosimeter be worn near the eyes to measure the lens dose to IVR nurses accurately, especially those exposed to relatively high doses.

  40. Evaluation of radiation dose and image quality for dental cone-beam computed tomography in pediatric patients. International-journal

    Misaki Ito, Koichi Chida, Shu Onodera, Ikuho Kojima, Masahiro Iikubo, Toshiki Kato, Masaki Fujisawa, Masayuki Zuguchi

    Journal of radiological protection : official journal of the Society for Radiological Protection 2023/09/11

    DOI: 10.1088/1361-6498/acf868  

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    Children are sensitive to radiation; therefore, it is necessary to reduce radiation dose as much as possible in pediatric patients. In addition, it is crucial to investigate the optimal imaging conditions as they considerably affect the radiation dose. In this study, we investigated the effect of different imaging conditions on image quality and optimized the imaging conditions for dental cone-beam computed tomography (CBCT) examinations to diagnose ectopic eruptions and impacted teeth in children. To achieve our aims, we evaluated radiation doses and subjective and objective image quality. The CBCT scans were performed using 3D Accuitomo F17. All combinations of a tube voltage (90 kV), tube currents (1, 2, 3 mA), fields of view (FOVs) (4×4, 6×6 cm), and rotation angles (360°, 180°) were used. Dose-area product (DAP) values were measured. SedentexCT IQ cylindrical phantom was used to physically evaluate the image quality. We used the modulation transfer function (MTF) as an index of resolution, the noise power spectrum (NPS) as an index of noise characteristics, and the system performance (SP) function as an overall evaluation index of the image. Five dentists visually evaluated the images from the head-neck phantom. The results showed that the image quality tended to worsen, and scores for visual evaluation decreased as tube currents, FOVs and rotation angles decreased. In particular, image noise negatively affected the delineation of the periodontal ligament space. The optimal imaging conditions were 90 kV, 2 mA, 4×4 cm FOV and 180° rotation. These results suggest that CBCT radiation doses can be significantly reduced by optimizing the imaging conditions.&#xD;&#xD.

  41. IVR従事者の頭部から発生する後方散乱線が自身の水晶体被ばく線量に及ぼす影響

    大野 紗耶, 今田 聡恵, 進藤 僚太, 山本 啓介, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1013-1014 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  42. 電子式積算線量計の校正前後評価

    岡部 優輝, 秋澤 彩乃, 和泉 哉汰, 佐々木 永仁, 米永 裕敬, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1068-1068 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  43. 高感度半導体式電子ポケット線量計の基本性能評価

    秋澤 彩乃, 和泉 哉汰, 岡部 優輝, 佐々木 永仁, 米永 裕敬, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1068-1068 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  44. β線用プラスチックシンチレーションサーベイメータの性能評価 線源検出器間距離が検出能に与える影響

    山本 啓介, 礒部 理央, 大野 紗耶, 今田 聡恵, 進藤 僚太, 稲葉 洋平, 細井 義夫, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1068-1069 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  45. 宿泊療養施設におけるCovid-19患者のポータブルX線撮影で生じる空間散乱線測定 胸部ファントムを用いた検討

    藤沢 昌輝, 稲葉 洋平, 山田 歩実, 加藤 聖規, 服部 兼進, 小野寺 保, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1069-1070 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  46. CR及びFPDシステム使用時におけるポータブルX線撮影従事者の水晶体被ばく線量の比較

    今田 聡恵, 芳賀 喜裕, 大友 一輝, 曽田 真宏, 阿部 美津也, 加賀 勇治, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1103-1103 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  47. ERCPにおけるCアーム式透視装置用放射線防護衝立の試作および基礎検討

    石井 浩生, 稲葉 洋平, 千田 浩一, 小野寺 崇, 斎 政博

    日本放射線技術学会雑誌 79 (9) 1016-1017 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  48. IVR従事者の頭部から発生する後方散乱線が自身の水晶体被ばく線量に及ぼす影響

    大野 紗耶, 今田 聡恵, 進藤 僚太, 山本 啓介, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1013-1014 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  49. ERCPにおけるCアーム式透視装置用放射線防護衝立の試作および基礎検討

    石井 浩生, 稲葉 洋平, 千田 浩一, 小野寺 崇, 斎 政博

    日本放射線技術学会雑誌 79 (9) 1016-1017 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  50. 電子式積算線量計の校正前後評価

    岡部 優輝, 秋澤 彩乃, 和泉 哉汰, 佐々木 永仁, 米永 裕敬, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1068-1068 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  51. 高感度半導体式電子ポケット線量計の基本性能評価

    秋澤 彩乃, 和泉 哉汰, 岡部 優輝, 佐々木 永仁, 米永 裕敬, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1068-1068 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  52. β線用プラスチックシンチレーションサーベイメータの性能評価 線源検出器間距離が検出能に与える影響

    山本 啓介, 礒部 理央, 大野 紗耶, 今田 聡恵, 進藤 僚太, 稲葉 洋平, 細井 義夫, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1068-1069 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  53. 宿泊療養施設におけるCovid-19患者のポータブルX線撮影で生じる空間散乱線測定 胸部ファントムを用いた検討

    藤沢 昌輝, 稲葉 洋平, 山田 歩実, 加藤 聖規, 服部 兼進, 小野寺 保, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1069-1070 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  54. CR及びFPDシステム使用時におけるポータブルX線撮影従事者の水晶体被ばく線量の比較

    今田 聡恵, 芳賀 喜裕, 大友 一輝, 曽田 真宏, 阿部 美津也, 加賀 勇治, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 79 (9) 1103-1103 2023/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  55. Evaluation of Lens Doses among Medical Staff Involved in Nuclear Medicine: Current Eye Radiation Exposure among Nuclear-Medicine Staff

    Masaki Fujisawa, Yoshihiro Haga, Masahiro Sota, Mitsuya Abe, Yuji Kaga, Yohei Inaba, Masatoshi Suzuki, Taiichiro Meguro, Yoshio Hosoi, Koichi Chida

    Applied Sciences 13 (16) 9182-9182 2023/08/12

    Publisher: MDPI AG

    DOI: 10.3390/app13169182  

    eISSN: 2076-3417

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    The International Commission on Radiological Protection has lowered the annual equivalent eye-lens dose to 20 mSv. Although occupational exposure can be high in nuclear medicine (NM) departments, few studies have been conducted regarding eye-lens exposure among NM staff. This study aimed to estimate the annual lens doses of staff in an NM department and identify factors contributing to lens exposure. Four nurses and six radiographers performing positron emission tomography (PET) examinations and four radiographers performing radioisotope (RI) examinations (excluding PET) were recruited for this study. A lens dosimeter was attached near the left eye to measure the 3-mm-dose equivalent; a personal dosimeter was attached to the left side of the neck to measure the 1-cm- and 70-µm-dose equivalents. Measurements were acquired over six months, and the cumulative lens dose was doubled to derive the annual dose. Correlations between the lens and personal-dosimeter doses, between the lens dose and the numbers of procedures, and between the lens dose and the amounts of PET drugs (radiopharmaceuticals) injected were examined. Wilcoxon’s signed-rank test was used to compare lens and personal-dosimeter doses. The estimated annual doses were 0.93 ± 0.13 mSv for PET nurses, 0.71 ± 0.41 mSv for PET radiographers, and 1.10 ± 0.53 mSv for RI radiographers. For PET nurses, but not for PET or RI radiographers, there was a positive correlation between the numbers of procedures and lens doses and between amounts injected and lens doses. There was a significant difference between the lens and personal-dosimeter doses of PET nurses. The use of protective measures, such as shielding, should prevent NM staff from receiving lens doses &gt; 20 mSv/year. However, depending on the height of the protective shield, PET nurses may be unable to assess the lens dose accurately using personal dosimeters.

  56. 水晶体用線量計DOSIRISの改良試作型ヘッドセットに関する初期検討

    今田 聡恵, 芳賀 喜裕, 曽田 真宏, 阿部 美津也, 加賀 勇治, 稲葉 洋平, 千田 浩一

    臨床放射線 68 (7) 723-729 2023/07

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    ポータブルX線撮影および血管撮影に従事する男性放射線技師7名(26~38歳、平均31.7歳:勤務歴4~15年、平均8.4年)を対象に、水晶体用線量計DOSIRISの改良試作型ヘッドセットについてアンケート調査を行い、その有用性について検討した。設問項目は(1)DOSIRISのヘッドセット部分に関して、(2)DOSIRISの線量計部分に関して、(3)従来型および改良試作型DOSIRISの全体評価、(4)DOSIRISの使用感とした。その結果、改良試作型は圧迫感や違和感が少なく使用感の向上を認め、有用性が示唆された。

  57. 無線応答式新型リアルタイム線量計の電波応答に関する検討

    服部 兼進, 加藤 聖規, 山田 歩実, 藤沢 昌輝, 安野 ひかる, 芳賀 喜裕, 曽田 真宏, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 22 (1) 3-9 2023/06

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

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    無線応答式新型リアルタイム線量計RaySafe i3(i3)の伝播応答特性をRaySafe i2(i2)と比較検討した。検討項目は電波応答距離、院内PHS・スマートフォンによる干渉、パルス透視に対する応答、インターベンショナルラジオロジー(IVR)室での電波応答とした。その結果、i3はi2やポケット線量計と同様以上の性能であった。i3は施設に合った位置に設置できてパルス状の放射線にも応答するため、IVRにおける手技中に被曝線量のリアルタイムモニタリングができ有用である。

  58. PCI術者の水晶体線量のリアルタイム測定に関する初期検討

    加藤 聖規, 藤沢 昌輝, 服部 兼進, 山田 歩実, 芳賀 喜裕, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 22 (1) 10-18 2023/06

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

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    経皮的冠動脈インターベンション(PCI)術者6名を対象に、新型半導体リアルタイム線量計RaySafe i3を用いて水晶体のリアルタイム被曝線量について検討した。その結果、撮影時は透視時に比べて被曝線量と線量率が高かった。線量率はX線画像モニター確認の際や手技中の前かがみ動作の際に増加する傾向で、RAO-Caudal方向を含んだ撮影は含まない撮影と比べて線量率が有意に低かった。天吊り防護板の不適切使用率は約78.4%で、天吊り防護板は意識的に使用し小まめな位置の調節が必要である。

  59. Spatial Scattering Radiation to the Radiological Technologist during Medical Mobile Radiography. International-journal

    Kazuki Otomo, Yohei Inaba, Keisuke Abe, Mana Onodera, Tomohiro Suzuki, Masahiro Sota, Yoshihiro Haga, Masatoshi Suzuki, Masayuki Zuguchi, Koichi Chida

    Bioengineering (Basel, Switzerland) 10 (2) 2023/02/16

    DOI: 10.3390/bioengineering10020259  

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    Mobile radiography allows for the diagnostic imaging of patients who cannot move to the X-ray examination room. Therefore, mobile X-ray equipment is useful for patients who have difficulty with movement. However, staff are exposed to scattered radiation from the patient, and they can receive potentially harmful radiation doses during radiography. We estimated occupational exposure during mobile radiography using phantom measurements. Scattered radiation distribution during mobile radiography was investigated using a radiation survey meter. The efficacy of radiation-reducing methods for mobile radiography was also evaluated. The dose decreased as the distance from the X-ray center increased. When the distance was more than 150 cm, the dose decreased to less than 1 μSv. It is extremely important for radiological technologists (RTs) to maintain a sufficient distance from the patient to reduce radiation exposure. The spatial dose at eye-lens height increases when the bed height is high, and when the RT is short in stature and abdominal imaging is performed. Maintaining sufficient distance from the patient is also particularly effective in limiting radiation exposure of the eye lens. Our results suggest that the doses of radiation received by staff during mobile radiography are not significant when appropriate radiation protection is used. To reduce exposure, it is important to maintain a sufficient distance from the patient. Therefore, RTs should bear this is mind during mobile radiography.

  60. 被ばく防護の実際と実践 水晶体被ばく線量のリアルタイム解析について

    加藤 聖規, 藤沢 昌輝, 服部 兼進, 山田 歩実, 芳賀 喜裕, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北支部雑誌 (32) np55-np56 2023/02

    Publisher: (公社)日本放射線技術学会-東北支部

  61. 指定箇所検査用放射能汚染モニタのバックグラウンド測定等の基礎検討

    中村 美緒, 佐藤 拓, 鈴木 華衣, 田辺 真子, 千葉 由梨乃, 菅野 典子, 越智 隆浩, 阿部 喜弘, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北支部雑誌 (32) np183-np184 2023/02

    Publisher: (公社)日本放射線技術学会-東北支部

  62. Evaluation of a New Real-Time Dosimeter Sensor for Interventional Radiology Staff

    Kenshin Hattori, Yohei Inaba, Toshiki Kato, Masaki Fujisawa, Hikaru Yasuno, Ayumi Yamada, Yoshihiro Haga, Masatoshi Suzuki, Masayuki Zuguchi, Koichi Chida

    Sensors 23 (1) 2023/01

    DOI: 10.3390/s23010512  

    ISSN: 1424-8220

  63. 経皮的冠動脈形成術における治療区域別被ばく線量とDRLs 2020の比較

    増渕 裕介, 千田 浩一, 稲葉 洋平, 景山 倫也, 嶋田 涼香, 山下 明

    日本放射線技術学会雑誌 78 (11) 1306-1313 2022/11

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

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    経皮的冠動脈形成術(PCI)における治療区域別被曝線量と診断参考レベル(Japan Diagnostic Reference Level 2020:DRLs2020)を比較検討した。PCIを施行された984例を対象とし、治療区域は右冠動脈(RCA)を#1~3、#4、左冠動脈(LCA)主幹部から前下行枝を#5~10、左回旋枝を#11~15に分類した。RCA、LCAの患者照射基準点空気カーマ積算値の中央値はそれぞれ1872.7mGy、1502.3mGyであり、積算値はRCAがLCAに対して有意に高く、特に#4の総線量は他の治療区域に対して有意に高かった。透視時間は#4が他の治療区域と比べて有意に長かった。治療区域別での患者照射基準点空気カーマ積算値の中央値は#1~3、#4、#5~10、#11~15それぞれ1770.4mGy、2732.0mGy、1409.1mGy、1705.6mGyであり、48.7%、81.8%、35.1%、45.9%がDRLs2020のDRL値を超えていた。医療被曝の最適化の目安として、有意な線量増加が見込まれる手技・治療部位に対しては新たなDRL値が望ましいと考えられた。

  64. 経皮的冠動脈形成術における治療区域別被ばく線量とDRLs 2020の比較

    増渕 裕介, 千田 浩一, 稲葉 洋平, 景山 倫也, 嶋田 涼香, 山下 明

    日本放射線技術学会雑誌 78 (11) 1306-1313 2022/11

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  65. PET検査に従事する看護師の水晶体被ばく線量に関する基礎検討

    藤沢 昌輝, 芳賀 善裕, 曽田 真宏, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 鈴木 正敏, 細井 義夫, 千田 浩一

    臨床放射線 67 (10) 1075-1083 2022/10

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    PET検査に従事する看護師4人の水晶体被ばく線量を評価した。水晶体用線量計DOSIRISとガラスバッジによる水晶体被ばく線量、従事した検査数、PET薬剤の投与量を調査した。その結果、左眼水晶体近傍にDOSIRISを装着して測定した3mm線量当量から算出した年間水晶体等価線量は0.93±0.13mSv、ガラスバッジでは0.66±0.17mSvであり、DOSIRISとガラスバッジの線量に十分な相関はなかったが、DOSIRISおよびガラスバッジの線量と、看護師の従事件数、薬剤投与量にはそれぞれ相関がみられた。本研究では年間のPET検査従事件数が推定568件であったことより、看護師が線量限度の20mSv/年を超過する可能性は低いと考えられるが、従事件数や薬剤投与量によっては水晶体の線量が高くなることが予想され、看護師のPET検査従事件数を減らすことが有効な水晶被ばく低減策といえる。

  66. 心臓・血管系IVR看護師の長期間測定による水晶体被ばく線量評価に関する検討

    山田 歩実, 芳賀 喜裕, 曽田 真宏, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 78 (9) 1035-1035 2022/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  67. 機能補償型γ線用シンチレーション式サーベイメータの温度依存性に関する評価

    礒部 理央, 大野 紗耶, 今田 聡恵, 進藤 僚太, 山本 啓介, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 78 (9) 1047-1047 2022/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  68. β線用サーベイメータの基礎的検討 プラスチックシンチレーションサーベイメータとGMサーベイメータの比較

    山本 啓介, 礒部 理央, 大野 紗耶, 今田 聡恵, 進藤 僚太, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 78 (9) 1047-1047 2022/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  69. 災害時用ポータブルX線発生装置のシステム開発

    加藤 聖規, 藤沢 昌輝, 村林 優樹, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 78 (9) 1059-1059 2022/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  70. ポータブルX線撮影時における従事者の水晶体被ばくに関する検討 臨床データを用いた研究

    今田 聡恵, 大友 一輝, 芳賀 善裕, 曽田 真宏, 阿部 美津也, 加賀 勇治, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 78 (9) 1063-1063 2022/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  71. 低線量・低線量率放射線の長期被ばくによる肝臓の酸化ストレス状態の変動

    石川 諒椰, 鈴木 正敏, 木野 康志, 遠藤 暁, 稲葉 洋平, 福本 学, 千田 浩一

    日本放射線技術学会雑誌 78 (9) 1104-1104 2022/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  72. 従事者被ばく測定用新型リアルタイム線量計の電波特性

    服部 兼進, 加藤 聖規, 藤沢 昌輝, 山田 歩実, 稲葉 洋平, 芳賀 喜裕, 阿部 美津也, 千田 浩一

    日本放射線技術学会雑誌 78 (9) 1105-1105 2022/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  73. 新型ハイブリッドサーベイメータの基本特性 空間散乱線量の測定に関して

    大森 悠斗, 石沢 祥子, 川口 和奏, 巻 周星, 山田 芙美佳, 村林 優樹, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 21 (1) 2-9 2022/06

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

  74. Ionizing radiation reduces glutathione levels in the eye: A pilot study

    Lue Sun, Yohei Inaba, Yu Sogo, Naoki Kunugita, Koichi Chida, Takashi Moritake

    Journal of Radiation Research and Applied Sciences 15 (2) 106-110 2022/06

    Publisher: Elsevier BV

    DOI: 10.1016/j.jrras.2022.05.012  

    ISSN: 1687-8507

  75. ERCPにおける基準空気カーマと入射表面空気カーマの乖離に関する基礎的検討

    石井 浩生, 安部 圭亮, 稲葉 洋平, 石塚 真澄, 坂本 博, 千田 浩一

    日本放射線技術学会総会学術大会予稿集 78回 231-231 2022/03

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  76. ERCPにおける基準空気カーマと入射表面空気カーマの乖離に関する基礎的検討

    石井 浩生, 安部 圭亮, 稲葉 洋平, 石塚 真澄, 坂本 博, 千田 浩一

    日本放射線技術学会総会学術大会予稿集 78回 231-231 2022/03

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  77. Occupational eye dose correlation with neck dose and patient-related quantities in interventional cardiology procedures.

    Hiroki Ishii, Koichi Chida, Ko Satsurai, Yoshihiro Haga, Yuji Kaga, Mitsuya Abe, Yohei Inaba, Masayuki Zuguchi

    Radiological physics and technology 15 (1) 54-62 2022/03

    DOI: 10.1007/s12194-022-00650-w  

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    Occupational eye dose monitoring during interventional radiology and interventional cardiology is important to avoid radiation-induced cataracts. The aim of this study was to assess the eye dose correlation with neck dose and patient-related quantities for interventional cardiology physicians and nurses. The originality of this study lies in obtaining correlations between the location of the dosimeter and eye dose radiation readings among different procedures and practitioners. The doses were measured for each procedure (18 procedures of coronary angiography and 16 procedures of percutaneous coronary intervention) using an active personal dosimeter. The eye dose for physicians was not correlated with the neck dose. The eye dose for nurses had a good correlation with the neck dose during both coronary angiography (R2 = 0.91) and percutaneous coronary intervention (R2 = 0.93). Kerma-area product values may be used for a rough estimation of the eye dose for physicians during routine coronary angiography procedures (R2 = 0.76). For nurses, the neck dose is a good proxy for the eye dose during coronary angiography and percutaneous coronary intervention procedures.

  78. New Radioprotective Device that can be Used for Fluoroscopic Exam: Possibility to Contribute to Staff Exposure Protection During VFSS

    Yoshiaki Morishima, Koichi Chida, Osamu Ito

    Dysphagia 37 (6) 1519-1524 2022/02/15

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1007/s00455-022-10411-x  

    ISSN: 0179-051X

    eISSN: 1432-0460

  79. Radiation Eye Dose for Physicians in CT Fluoroscopy-Guided Biopsy. International-journal

    Yohei Inaba, Shin Hitachi, Munenori Watanuki, Koichi Chida

    Tomography (Ann Arbor, Mich.) 8 (1) 438-446 2022/02/08

    DOI: 10.3390/tomography8010036  

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    It is important to evaluate the radiation eye dose (3 mm dose equivalent, Hp (3)) received by physicians during computed tomography fluoroscopy (CTF)-guided biopsy, as physicians are close to the source of scattered radiation. In this study, we measured the radiation eye dose in Hp (3) received by one physician during CTF in a timeframe of 18 months using a direct eye dosimeter, the DOSIRISTM. The physician placed eye dosimeters above and under their lead (Pb) eyeglasses. We recorded the occupational radiation dose received using a neck dosimeter, gathered CT dose-related parameters (e.g., CT-fluoroscopic acquisition number, CT-fluoroscopic time, and CT-fluoroscopic mAs), and performed a total of 95 procedures during CTF-guided biopsies. We also estimated the eye dose (Hp (3)) received using neck personal dosimeters and CT dose-related parameters. The physician eye doses (right and left side) received in terms of Hp (3) without the use of Pb eyeglasses for 18 months were 2.25 and 2.06 mSv, respectively. The protective effect of the Pb eyeglasses (0.5 mm Pb) on the right and left sides during CTF procedures was 27.8 and 37.5%, respectively. This study proved the existence of significant correlations between the eye and neck dose measurement (right and left sides, R2 = 0.82 and R2 = 0.55, respectively) in physicians. In addition, we found significant correlations between CT-related parameters, such as CT-fluoroscopy mAs, and radiation eye doses (right and left sides, R2 = 0.50 and R2 = 0.52, respectively). The eye dose of Hp (3) received in CTF was underestimated when evaluated using neck dosimeters. Therefore, we suggest that the physician involved in CTF use a direct eye dosimeter such as the DOSIRIS for the accurate evaluation of their eye lens dose.

  80. Analysis of whole-blood antioxidant capacity after chronic and localized irradiation using the i-STrap method. International-journal

    Lue Sun, Yohei Inaba, Yu Sogo, Kumi Morikawa, Naoki Kunugita, Koichi Chida, Takashi Moritake

    Journal of radiation research 63 (1) 30-35 2022/01/20

    DOI: 10.1093/jrr/rrab099  

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    Ionizing radiation exposure affects the redox state in vivo. Recently, whole-blood antioxidant capacity (WBAC) has been reported to decrease in a dose-dependent manner after acute total body irradiation (TBI). However, changes in WBAC after localized and chronic irradiations have not been reported. This study analyzed changes to WBAC in mice after either localized irradiation (irradiation of the left hind leg only) or chronic TBI using the i-STrap method. Leg-localized irradiation exerted limited effects on WBAC, while WBAC decreased in a dose rate-dependent manner after TBI. Further, the WBAC reached the minimum value in a shorter period at a smaller dose rate. Our results suggest that changes in WBAC do not directly reflect absorbed dose, but may reflect radiation-induced biological damage at the systemic level. This study will contribute to the understanding of radiation-induced injuries and diseases, and will facilitate the establishment of biomarkers for radiation exposure.

  81. 医療スタッフ用新型リアルタイム線量計の角度特性に関する検討

    服部 兼進, 加藤 聖規, 山田 歩実, 藤沢 昌輝, 安野 ひかる, 芳賀 喜裕, 曽田 真宏, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北支部雑誌 (31) np119-np120 2022/01

    Publisher: (公社)日本放射線技術学会-東北支部

  82. 防護眼鏡のX線の入射方向の違いによる遮蔽効果の基礎検討 鉛当量の異なる眼鏡を用いたファントム実験

    礒部 理央, 大野 紗耶, 郷内 優作, 進藤 僚太, 古川 未来, 山本 啓介, 遠藤 美芽, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北支部雑誌 (31) np121-np122 2022/01

    Publisher: (公社)日本放射線技術学会-東北支部

  83. 放射線防護ドレープによるIVR従事者の水晶体被ばく低減に関するファントムを用いた基礎実験

    巻 周星, 大森 悠斗, 村林 優樹, 大友 一輝, 芳賀 善裕, 曽田 真宏, 阿部 美津弥, 加賀 勇治, 千田 浩一, 稲葉 洋平

    日本放射線技術学会東北支部雑誌 (31) np123-np124 2022/01

    Publisher: (公社)日本放射線技術学会-東北支部

  84. 心血管インターベンションに携わる看護師における水晶体被ばく線量の推定方法

    山田 歩実, 大友 一輝, 佐藤 文貴, 千田 浩一, 稲葉 洋平, 芳賀 喜裕, 曽田 真宏, 加賀 勇治, 加藤 砂江子

    日本放射線技術学会東北支部雑誌 (31) np127-np128 2022/01

    Publisher: (公社)日本放射線技術学会-東北支部

  85. プラスチックシンチレータを用いたβ線用サーベイメータの基本特性

    山本 啓介, 礒部 理央, 大野 紗耶, 郷内 優作, 進藤 僚太, 古川 未来, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北支部雑誌 (31) np162-np163 2022/01

    Publisher: (公社)日本放射線技術学会-東北支部

  86. GMサーベイメータの温度依存性に関する基礎的検討

    郷内 優作, 礒部 理央, 大野 紗耶, 古川 未来, 進藤 僚太, 山本 啓介, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北支部雑誌 (31) np166-np167 2022/01

    Publisher: (公社)日本放射線技術学会-東北支部

  87. Evaluation of Peak Skin Doses and Lens Doses during Interventional Neuroradiology Using a Direct Measurement System

    Satoru Kawauchi, Koichi Chida, Takashi Moritake, Yusuke Hamada, Shogo Yoda, Hideyuki Sakuma, Wataro Tsuruta, Yuji Matsumaru

    Journal of Neuroendovascular Therapy 16 (10) 491-497 2022

    Publisher: The Japanese Society for Neuroendovascular Therapy

    DOI: 10.5797/jnet.oa.2022-0024  

    ISSN: 1882-4072

    eISSN: 2186-2494

  88. Total body irradiation causes a chronic decrease in antioxidant levels

    Lue Sun, Yohei Inaba, Yu Sogo, Atsuo Ito, Mahesh Bekal, Koichi Chida, Takashi Moritake

    Scientific Reports 11 (1) 2021/12

    DOI: 10.1038/s41598-021-86187-1  

    eISSN: 2045-2322

  89. 心臓カテーテルインターベンションに携わる看護師の水晶体被ばく 水晶体線量の左右差に関する比較評価

    山田 歩実, 大友 一輝, 佐藤 文貴, 芳賀 喜裕, 曽田 真宏, 加賀 勇治, 阿部 美津也, 加藤 砂江子, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 20 (2) 52-60 2021/11

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

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    心臓カテーテルインターベンション(IVR)に従事した看護師12名を対象に水晶体被曝線量を測定し、手技ごとの水晶体線量の左右差を比較した。検討内容は経皮的冠動脈インターベンション(PCI)・経皮的心筋焼灼術(ABL)における各線量計装置位置の線量、水晶体線量と患者線量パラメーターとの相関、各線量計装置での線量及び患者線量パラメーターのPCI・ABL比較とした。その結果、PCIでは僅かであるが左眼位置の線量が中央や右眼位置より高く、ABLでは右眼位置の線量が最も高く、ABLは全ての位置でPCIより有意に高かった。PCIはABLに比して水晶体線量と患者線量パラメータとの高い相関を認めた。看護師や手技ごとに条件が異なるため、1個の線量計で正確な両眼水晶体の被曝線量を評価するにはPCIでは左眼近傍、ABLでは右眼近傍の装着が適切である。

  90. 心臓カテーテルインターベンションに携わる看護師の水晶体被ばく 水晶体線量の左右差に関する比較評価

    山田 歩実, 大友 一輝, 佐藤 文貴, 芳賀 喜裕, 曽田 真宏, 加賀 勇治, 阿部 美津也, 加藤 砂江子, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 20 (2) 52-60 2021/11

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

  91. Non-Lead Protective Aprons for the Protection of Interventional Radiology Physicians from Radiation Exposure in Clinical Settings: An Initial Study. International-journal

    Mamoru Kato, Koichi Chida, Masato Munehisa, Tadaya Sato, Yohei Inaba, Masatoshi Suzuki, Masayuki Zuguchi

    Diagnostics (Basel, Switzerland) 11 (9) 2021/09/03

    DOI: 10.3390/diagnostics11091613  

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    Radiation protection/evaluation during interventional radiology (IVR) poses a very important problem. Although IVR physicians should wear protective aprons, the IVR physician may not tolerate wearing one for long procedures because protective aprons are generally heavy. In fact, orthopedic problems are increasingly reported in IVR physicians due to the strain of wearing heavy protective aprons during IVR. In recent years, non-Pb protective aprons (lighter weight, composite materials) have been developed. Although non-Pb protective aprons are more expensive than Pb protective aprons, the former aprons weigh less. However, whether the protective performance of non-Pb aprons is sufficient in the IVR clinical setting is unclear. This study compared the ability of non-Pb and Pb protective aprons (0.25- and 0.35-mm Pb-equivalents) to protect physicians from scatter radiation in a clinical setting (IVR, cardiac catheterizations, including percutaneous coronary intervention) using an electric personal dosimeter (EPD). For radiation measurements, physicians wore EPDs: One inside a personal protective apron at the chest, and one outside a personal protective apron at the chest. Physician comfort levels in each apron during procedures were also evaluated. As a result, performance (both the shielding effect (98.5%) and comfort (good)) of the non-Pb 0.35-mm-Pb-equivalent protective apron was good in the clinical setting. The radiation-shielding effects of the non-Pb 0.35-mm and Pb 0.35-mm-Pb-equivalent protective aprons were very similar. Therefore, non-Pb 0.35-mm Pb-equivalent protective aprons may be more suitable for providing radiation protection for IVR physicians because the shielding effect and comfort are both good in the clinical IVR setting. As non-Pb protective aprons are nontoxic and weigh less than Pb protective aprons, non-Pb protective aprons will be the preferred type for radiation protection of IVR staff, especially physicians.

  92. 心臓・血管系IVRに従事する医師の水晶体被ばく線量の左右差に関する検討

    大友 一輝, 佐藤 文貴, 芳賀 喜裕, 曽田 真宏, 加賀 勇治, 阿部 美津也, 伊澤 毅, 村林 優樹, 稲葉 洋平, 千田 浩一

    臨床放射線 66 (9) 903-913 2021/09

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    心臓・血管系のIVR(interventional radiology)に従事する医師が水晶体用線量計を装着する適切な位置を評価するため、左右の水晶体被ばく線量の実態に関する調査を行った。また、一つの手技ごとの水晶体線量と被ばく線量に関するパラメータ(透視時間等)との相関についても評価を行った。測定対象は、経皮的冠動脈インターベンション(PCI)および経皮的末梢血管インターベンション(PPI)に従事する医師20名とした。PCI・PPIにおける各装着位置の線量を測定した結果、PCI、PPIともに左眼位置の線量が最も高く、次いで中央位置、右眼位置の順に線量が高い結果となった。1件あたりの被ばく線量が低い結果となった医師については、1件あたりの透視時間やair karma(AK)、dose area product(DAP)も比較的低い傾向にあった。また左右の線量差の少ない医師については、透視時間やAK、DAPは高い値であった一方、左眼位置の被ばく線過は比較的低い値であった。また、PCIにおいて、治療を行った部位別に医師の水晶体被ばく線量を比較した。その結果、治療部位が右冠動脈(RCA)の場合には他の手技と比較して左眼位置の線量が高く、左右の線量比が大きくなる結果となった。水晶体線量と患者被ばく線量に関するパラメータとの相関については、PPIにおいてはAKおよびDAPとの間に良好な相関がみられた。PCIにおいては、水晶体位置の線量と各患者・被ばく線量に関するパラメータとの間はいずれも弱い相関であった。

  93. シンチレーションサーベイメータの温度特性に関する基礎的検討

    古川 未来, 礒部 理央, 大野 紗耶, 郷内 優作, 進藤 僚太, 山本 啓介, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 77 (9) 1119-1119 2021/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  94. 新型ハイブリッドサーベイメータの基本的性能評価 X線検査室等の空間散乱線測定に関する検討

    大森 悠斗, 巻 周星, 石沢 祥子, 川口 和奏, 山田 芙美佳, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 77 (9) 1119-1119 2021/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  95. 新しい医療スタッフ用リアルタイム被ばくモニタリングシステムの基礎的性能評価

    服部 兼進, 加藤 聖規, 藤沢 昌輝, 安野 ひかる, 山田 歩実, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 77 (9) 1121-1121 2021/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  96. 心臓・血管系IVRに従事する医師の水晶体被ばく線量の左右差に関する検討

    大友 一輝, 佐藤 文貴, 芳賀 喜裕, 曽田 真宏, 加賀 勇治, 阿部 美津也, 伊澤 毅, 村林 優樹, 稲葉 洋平, 千田 浩一

    臨床放射線 66 (9) 903-913 2021/09

    Publisher: 金原出版(株)

    ISSN: 0009-9252

  97. シンチレーションサーベイメータの温度特性に関する基礎的検討

    古川 未来, 礒部 理央, 大野 紗耶, 郷内 優作, 進藤 僚太, 山本 啓介, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 77 (9) 1119-1119 2021/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  98. 新型ハイブリッドサーベイメータの基本的性能評価 X線検査室等の空間散乱線測定に関する検討

    大森 悠斗, 巻 周星, 石沢 祥子, 川口 和奏, 山田 芙美佳, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 77 (9) 1119-1119 2021/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  99. 新しい医療スタッフ用リアルタイム被ばくモニタリングシステムの基礎的性能評価

    服部 兼進, 加藤 聖規, 藤沢 昌輝, 安野 ひかる, 山田 歩実, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 77 (9) 1121-1121 2021/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  100. Evaluation of Radiation Protection Methods for Assistant Staff during CT Imaging in High-energy Trauma: Lens Dosimetry with a Phantom Study. International-journal

    Joji Ota, Hajime Yokota, Tatsuya Kawasaki, Junichi Taoka, Hideyuki Kato, Koichi Chida, Yoshitada Masuda, Takashi Uno

    Health physics 120 (6) 635-640 2021/06/01

    DOI: 10.1097/HP.0000000000001391  

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    ABSTRACT: Staff are exposed to radiation in the scanning room when assisting with CT scans of patients requiring ventilatory support during procedures. We measured lens doses using a phantom during a high-energy trauma protocol. Dosimetry showed that the unprotected lens received 2.02 mGy on the right and 1.91 mGy on the left, which are not negligible doses. Respective exposures to the right and left lens were 53.6% and 55.1% when wearing 0.07 mm Pb protective glasses with side covers; 53.7% and 64.2% when wearing 0.7 mm Pb glasses without side covers when facing away from the patient couch; and 92.1% and 91.2% using protective shielding in the gantry. Since the face direction may change during assistance with CT imaging, it is desirable that the protective glasses have a shape with a side cover. The protective shielding had a major radiation reduction effect, although it is expensive to acquire, install, and maintain.

  101. Evaluation of novel X-ray protective eyewear in reducing the eye dose to interventional radiology physicians. International-journal

    Mime Endo, Yoshihiro Haga, Masahiro Sota, Akiko Tanaka, Kazuki Otomo, Yuuki Murabayashi, Mitsuya Abe, Yuji Kaga, Yohei Inaba, Msatoshi Suzuki, Taiichiro Meguro, Koichi Chida

    Journal of radiation research 62 (3) 414-419 2021/05/12

    DOI: 10.1093/jrr/rrab014  

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    The new recommendation of the International Commission on Radiological Protection for occupational eye dose is an equivalent dose limit to the eye of 20 mSv year-1, averaged over a 5-year period. This recommendation is a drastic reduction from the previous limit of 150 mSv year-1. Hence, it is important to protect physicians' eyes from X-ray radiation. Particularly in interventional radiology (IVR) procedures, many physicians use protective lead (Pb) glasses to reduce their occupational exposure. This study assessed the shielding effects of novel 0.07 mm Pb glasses. The novel glasses (XR-700) have Pb-acrylic lens molded in three dimensions. We studied the novel type of 0.07 mm Pb glasses over a period of seven consecutive months. The eye dose occupational radiation exposure of seven IVR physicians was evaluated during various procedures. All IVR physicians wore eye dosimeters (DOSIRIS™) close to the left side of the left eye. To calculate the shielding effects of the glasses, this same type of eye dosimeter was worn both inside and outside of the Pb lenses. The average shielding effect of the novel glasses across the seven physicians was 61.4%. Our results suggest an improved shielding effect for IVR physicians that use these glasses. No physician complained that the new glasses were uncomfortable; therefore comfort is not a problem. The lightweight glasses were acceptable to IVR physicians, who often must perform long procedures. Thus, the novel glasses are comfortable and reasonably protective. Based on the results of this study, we recommend that IVR physicians use these novel 0.07 mm Pb glasses to reduce their exposure.

  102. Occupational Radiation Dose to Eye Lenses in CT-Guided Interventions Using MDCT-Fluoroscopy. International-journal

    Yohei Inaba, Shin Hitachi, Munenori Watanuki, Koichi Chida

    Diagnostics (Basel, Switzerland) 11 (4) 2021/04/02

    DOI: 10.3390/diagnostics11040646  

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    In computed tomography (CT)-guided interventions (CTIs), physicians are close to a source of scattered radiation. The physician and staff are at high risk of radiation-induced injury (cataracts). Thus, dose-reducing measures for physicians are important. However, few previous reports have examined radiation doses to physicians in CTIs. This study evaluated the radiation dose to the physician and medical staff using multi detector (MD)CT-fluoroscopy, and attempted to understand radiation-protection and -reduction methods. The procedures were performed using an interventional radiology (IVR)-CT system. We measured the occupational radiation dose (physician and nurse) using a personal dosimeter in real-time, gathered CT-related parameters (fluoroscopy time, mAs, CT dose index (CTDI), and dose length product (DLP)), and performed consecutive 232 procedures in CT-guided biopsy. Physician doses (eye lens, neck, and hand; μSv, average ± SD) in our CTIs were 39.1 ± 36.3, 23.1 ± 23.7, and 28.6 ± 31.0, respectively. Nurse doses (neck and chest) were lower (2.3 ± 5.0 and 2.4 ± 4.4, respectively) than the physician doses. There were significant correlations between the physician doses (eye and neck) and related factors, such as CT-fluoroscopy mAs (eye dose: r = 0.90 and neck dose: r = 0.83). We need to understand the importance of reducing/optimizing the dose to the physician and medical staff in CTIs. Our study suggests that physician and staff doses were not significant when the procedures were performed with the appropriate radiation protection and low-dose techniques.

  103. 経皮的心血管インターベンションにおける治療区域別の手技線量とDRLs 2020の比較

    増渕 裕介, 千田 浩一, 稲葉 洋平, 嶋田 涼香, 山下 明, 景山 倫也, 水沼 仁孝

    日本インターベンショナルラジオロジー学会雑誌 36 (Suppl.) 188-188 2021/04

    Publisher: (一社)日本インターベンショナルラジオロジー学会

    ISSN: 1340-4520

    eISSN: 2185-6451

  104. Total body irradiation causes a chronic decrease in antioxidant levels. International-journal

    Lue Sun, Yohei Inaba, Yu Sogo, Atsuo Ito, Mahesh Bekal, Koichi Chida, Takashi Moritake

    Scientific reports 11 (1) 6716-6716 2021/03/24

    DOI: 10.1038/s41598-021-86187-1  

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    Ionizing radiation exposure may not only cause acute radiation syndrome, but also an increased risk of late effects. It has been hypothesized that induction of chronic oxidative stress mediates the late effects of ionizing radiation. However, only a few reports have analyzed changes in long-term antioxidant capacity after irradiation in vivo. Our previous study demonstrated changes in whole-blood antioxidant capacity and red blood cell (RBC) glutathione levels within 50 days after total body irradiation (TBI). In this study, seven-week-old, male, C57BL/6J mice exposed to total body irradiation by X-ray and changes in whole-blood antioxidant capacity and RBC glutathione levels at ≥ 100 days after TBI were investigated. Whole-blood antioxidant capacity was chronically decreased in the 5-Gy group. The RBC reduced glutathione (GSH) level and the GSH/oxidative glutathione (GSSG) ratio were chronically decreased after ≥ 1 Gy of TBI. Interestingly, the complete blood counts (CBC) changed less with 1-Gy exposure, suggesting that GSH and the GSH/GSSG ratio were more sensitive radiation exposure markers than whole-blood antioxidant capacity and CBC counts. It has been reported that GSH depletion is one of the triggers leading to cataracts, hypertension, and atherosclerosis, and these diseases are also known as radiation-induced late effects. The present findings further suggest that chronic antioxidant reduction may contribute to the pathogenesis of late radiation effects.

  105. Radioprotection of eye lens using protective material in neuro cone-beam computed tomography: Estimation of dose reduction rate and image quality

    Satoru Kawauchi, Koichi Chida, Takashi Moritake, Yusuke Hamada, Wataro Tsuruta

    PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS 82 192-199 2021/02

    DOI: 10.1016/j.ejmp.2021.02.001  

    ISSN: 1120-1797

    eISSN: 1724-191X

  106. Radioprotection of eye lens using protective material in neuro cone-beam computed tomography: Estimation of dose reduction rate and image quality. International-journal

    Satoru Kawauchi, Koichi Chida, Takashi Moritake, Yusuke Hamada, Wataro Tsuruta

    Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) 82 192-199 2021/02

    DOI: 10.1016/j.ejmp.2021.02.001  

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    PURPOSE: In cerebral angiography, for diagnosis and interventional neuroradiology, cone-beam computed tomography (CBCT) scan is frequently performed for evaluating brain parenchyma, cerebral hemorrhage, and cerebral infarction. However, the patient's eye lens is more frequently exposed to excessive doses in these scans than in the previous angiography and interventional neuroradiology (INR) procedures. Hence, radioprotection for the lenses is needed. This study selects the most suitable eye lens protection material for CBCT from among nine materials by evaluating the dose reduction rate and image quality. METHODS: To determine the dose reduction rate, the lens doses were measured using an anthropomorphic head phantom and a real-time dosimeter. For image quality assessment, the artifact index was calculated based on the pixel value and image noise within various regions of interest in a water phantom. RESULTS: The protective materials exhibited dose reduction; however, streak artifacts were observed near the materials. The dose reduction rate and the degree of the artifact varied significantly depending on the protective material. The dose reduction rates were 14.6%, 14.2%, and 26.0% when bismuth shield: normal (bismuth shield in the shape of an eye mask), bismuth shield: separate (two separate bismuth shields), and lead goggles were used, respectively. The "separate" bismuth shield was found to be effective in dose reduction without lowering the image quality. CONCLUSION: We found that bismuth shields and lead goggles are suitable protective devices for the optimal reduction of lens doses.

  107. Lens dose reduction with a bismuth shield in neuro cone-beam computed tomography: an investigation on optimum shield device placement conditions

    Satoru Kawauchi, Koichi Chida, Yusuke Hamada, Wataro Tsuruta

    Radiological Physics and Technology 2021

    Publisher: Springer

    DOI: 10.1007/s12194-021-00644-0  

    ISSN: 1865-0341 1865-0333

  108. [Calculation of Lens Exposure Reduction Using Organ-effective Modulation in Pediatric Head CT].

    Joji Ota, Yuya Kawakami, Takayuki Sada, Ryosuke Irie, Koichi Chida, Yoshitada Masuda

    Nihon Hoshasen Gijutsu Gakkai zasshi 77 (4) 326-334 2021

    Publisher:

    DOI: 10.6009/jjrt.2021_JSRT_77.4.326  

    ISSN: 0369-4305

    eISSN: 1881-4883

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    PURPOSE: Using a pediatric head phantom constructed in our department, we examined a method to reduce exposure by using organ-effective modulation (OEM; Toshiba Medical Systems Corporation, Tochigi) to tilt the gantry during pediatric head computed tomography (CT) scanning. METHOD: The radiation reduction and CT image standard deviation (SD) were measured at gantry angles at which the orbit was slightly irradiated, partially irradiated, and completely irradiated. The OEM incident surface dose reduction rate was measured using an automatic exposure control (AEC) phantom with a diameter of 6-18 cm. RESULTS: The lens surface dose reduction rate using OEM was 21.2%. When the gantry was tilted and the orbit was completely out of the scanning range, the rate of reduction was 47.8%. OEM incident surface dose reduction rates were 27.4% for a phantom diameter of 18 cm, 22.0% for that of 16 cm, 17.8% for that of 14 cm, 17.2% for that of 12 cm, 8.4% for that of 10 cm, and 0% for that of 8 cm and 6 cm. OEM effectiveness decreased with decreasing phantom diameter. The use of OEM increased the rate of change of SD by 1.25´ when the gantry inclination was 0°, 1.27´ when the gantry inclination was 10°, and 1.27´ when the gantry inclination was 20°in the 12 o'clock position. CONCLUSION: The degree of reduction in exposure dose to the lens in pediatric head CT imaging was 47.8% by completely removing the lens from the irradiation range using gantry tilt and 21.2% by using OEM. The effect of OEM changed in proportion to tube current. The exposure reduction effect of the OEM decreases with decreasing head size, indicating its reduced effectiveness in head CT scans of smaller infants.

  109. 空間線量測定用新型サーベイメータの性能評価

    森島 貴顕, 千田 浩一, 稲葉 洋平, 千葉 昌弘, 千葉 浩生

    臨床放射線 65 (12) 1327-1333 2020/11

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    X線透視撮影下のinterventional radiologyにおいて空間線量を把握し被ばく線量を管理するために、従来は1cm線域当量が測定可能な空間線量計(サーベイメータ)が用いられてきた。今回、新しく1cm線量当量に加え、70μm線量当量も測定可能なサーベイメータであるOD-01線量計の基本的な性能評価を行い、有用性について検討した。寝台上にアクリルファントム(厚さ20cm)を置き、散乱線量を基準電離箱線量計(ICS-321)とOD-01線量計を用い、基準線量計とOD-01線量計の1cm線量当量、70μm線量当量を比較検討した。検討項目は、エネルギー(管電圧)依存、方向依存性とした。エネルギー(管電圧)依存性は、基準線量計とOD-01線量計の1cm線量当量[Hp(10)]、70μm線量当量[Hp(0.07)]の線量の相関を調べた。Hp(10)の管電圧依存はr2=0.9995と相関は良好であった。基準線量計に対するOD-01線量計Hp(0.07)のエネルギー(管電圧)依存性についても、Hp(10)同様にr2=0.9998と相関は良好であった。方向依存性は、基準線量計と比べHp(10)、Hp(0.07)とも角度が深くなるにつれて方向依存性が大きくなる傾向がみられたが、両者とも±5%以内の感度低下であり、方向依存性は良好であった。

  110. Hybrid Operating Room System for the Treatment of Thoracic and Abdominal Aortic Aneurysms: Evaluation of the Radiation Dose Received by Patients. International-journal

    Yoshihiro Haga, Koichi Chida, Masahiro Sota, Yuji Kaga, Mitsuya Abe, Yohei Inaba, Masatoshi Suzuki, Taiichiro Meguro, Masayuki Zuguchi

    Diagnostics (Basel, Switzerland) 10 (10) 2020/10/19

    DOI: 10.3390/diagnostics10100846  

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    In recent years, endovascular treatment of aortic aneurysms has attracted considerable attention as a promising alternative to traditional surgery. Hybrid operating room systems (HORSs) are increasingly being used to perform endovascular procedures. The clinical benefits of endovascular treatments using HORSs are very clear, and these procedures are increasing in number. In procedures such as thoracic endovascular aortic repair (TEVAR) and endovascular aortic repair (EVAR), wires and catheters are used to deliver and deploy the stent graft in the thoracic/abdominal aorta under fluoroscopic control, including DSA. Thus, the radiation dose to the patient is an important issue. We determined radiation dose indicators (the dose-area product (DAP) and air karma (AK) parameters) associated with endovascular treatments (EVAR and TEVAR) using a HORS. As a result, the mean ± standard deviation (SD) DAPs of TEVAR and EVAR were 323.7 ± 161.0 and 371.3 ± 186.0 Gy x cm2, respectively. The mean ± SD AKs of TEVAR and EVAR were 0.92 ± 0.44 and 1.11 ± 0.54 Gy, respectively. The mean ± SD fluoroscopy times of TEVAR and EVAR were 13.4 ± 7.1 and 23.2 ± 11.7 min, respectively. Patient radiation dose results in this study of endovascular treatments using HORSs showed no deterministic radiation effects, such as skin injuries. However, radiation exposure during TEVAR and EVAR cannot be ignored. The radiation dose should be evaluated in HORSs during endovascular treatments. Reducing/optimizing the radiation dose to the patient in HORSs is important.

  111. Hybrid operating room system for the treatment of thoracic and abdominal aortic aneurysms: Evaluation of the radiation dose received by patients

    Yoshihiro Haga, Koichi Chida, Masahiro Sota, Yuji Kaga, Mitsuya Abe, Yohei Inaba, Masatoshi Suzuki, Taiichiro Meguro, Masayuki Zuguchi

    Diagnostics 10 (10) 2020/10/19

    DOI: 10.3390/diagnostics10100846  

    eISSN: 2075-4418

  112. 生物学的線量推定の新技術 被ばく後の血液抗酸化能変化(Novel technics for biodosimetry Dose-dependent decrease in antioxidant capacity of blood after irradiation: A novel potential marker for biodosimetry)

    孫 略, 稲葉 洋平, 千田 浩一, 盛武 敬

    日本放射線影響学会大会講演要旨集 63回 50-50 2020/10

    Publisher: (一社)日本放射線影響学会

    ISSN: 1347-8680

  113. 福島原発事故による周辺生物への影響調査研究 福島原発事故による動物・環境試料を用いた放射線被ばく影響解析(Radiation effects on non-human biota after the Fukushima nuclear power plant accident Comprehensive analysis of radiation effects using disaster affected animal and environmental samples of Fukushima Dai-ichi nuclear power plant accident)

    鈴木 正敏, 遠藤 暁, 松谷 祐輝, 岡 壽崇, 小野 拓実, 光安 優典, 木野 康志, 高橋 温, 篠田 壽, 漆原 佑介, 中島 裕夫, 二宮 和彦, 三浦 富智, 稲葉 洋平, 千田 浩一, 福本 学

    日本放射線影響学会大会講演要旨集 63回 38-38 2020/10

    Publisher: (一社)日本放射線影響学会

    ISSN: 1347-8680

  114. Radiation eye dose to medical staff during respiratory endoscopy under X-ray fluoroscopy

    Yoshihiro Haga, Koichi Chida, Yuichiro Kimura, Shinsuke Yamanda, Masahiro Sota, Mitsuya Abe, Yuji Kaga, Taiichiro Meguro, Masayuki Zuguchi

    Journal of Radiation Research 61 (5) 691-696 2020/09/01

    Publisher: Oxford University Press

    DOI: 10.1093/jrr/rraa034  

    ISSN: 1349-9157 0449-3060

  115. An initial investigation of a wireless patient radiation dosimeter for use in interventional radiology

    Yohei Inaba, Koichi Chida, Yuuki Murabayashi, Mime Endo, Kazuki Otomo, Masayuki Zuguchi

    Radiological Physics and Technology 13 (3) 321-326 2020/09/01

    DOI: 10.1007/s12194-020-00575-2  

    ISSN: 1865-0333

    eISSN: 1865-0341

  116. 3mm線量当量線量計を用いたCT透視下生検における水晶体被曝線量の実測

    稲葉 洋平, 大友 一輝, 遠藤 美芽, 村林 優樹, 常陸 真, 綿貫 宗則, 千田 浩一

    日本インターベンショナルラジオロジー学会雑誌 35 (Suppl.) 240-240 2020/08

    Publisher: (一社)日本インターベンショナルラジオロジー学会

    ISSN: 1340-4520

    eISSN: 2185-6451

  117. 肝動脈化学塞栓療法施行肝細胞癌患者の累積被ばく線量の実態調査

    増渕 裕介, 千田 浩一, 稲葉 洋平, 中野 繁明, 山下 明, 水沼 仁孝

    日本インターベンショナルラジオロジー学会雑誌 35 (1) 51-57 2020/08

    Publisher: (一社)日本インターベンショナルラジオロジー学会

    ISSN: 1340-4520

    eISSN: 2185-6451

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    肝動脈化学塞栓療法(TACE)を施行した肝細胞癌患者66例を対象に6年4ヵ月間の累積線量を求め、TACEの被ばく増加因子と累積被ばく線量低減について検討した。その結果、血管撮影、X線CTを総じて累積線量は323.6±214.5mSvであり、X線CTが78.9%を占めていた。また、患者のX線CT線量や累積線量は生存期間と正比例を示していた。尚、経過観察CTは定期的に行われるため、1回の撮影線量低減が累積線量低減の要諦であり、長期生存患者ほど大きな総量低減が見込めると考えられた。

  118. TREATMENT OF INTERNAL CAROTID ANEURYSMS USING PIPELINE EMBOLIZATION DEVICES: MEASURING THE RADIATION DOSE OF THE PATIENT AND DETERMINING THE FACTORS AFFECTING IT. International-journal

    Satoru Kawauchi, Koichi Chida, Takashi Moritake, Yusuke Hamada, Yuji Matsumaru, Wataro Tsuruta, Masayuki Sato, Hisayuki Hosoo, Lue Sun

    Radiation protection dosimetry 188 (3) 389-396 2020/06/24

    DOI: 10.1093/rpd/ncz298  

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    The purpose of this study was to measure the peak skin dose (PSD) and bilateral lens doses using radiophotoluminescence glass dosimeters and to determine the factors influencing the radiation dose in cases of cerebral aneurysm treated with pipeline embolization devices (PEDs). The cumulative dose, PSD and right and left lens doses were 3818.1 ± 1604.6, 1880.0 ± 723.0, 124.8 ± 49.2 and 180.7 ± 124.8 mGy, respectively. Using multivariate analysis, body mass index (p < 0.01; odds ratio (OR) = 1.806; 95% confidence interval (CI) = 1.007-3.238) and deployment time of PED (p < 0.05; OR = 1.107; 95% CI = 1.001-1.224) were found to be the independent predictors of PSD exceeding 2 Gy. Measures such as collimation of the radiation field and optimization of radiation dose should be taken to reduce the radiation to the patient.

  119. ポータブルX線撮影における放射線技師の被曝防護意識に関する調査

    大友 一輝, 遠藤 美芽, 村林 優樹, 安部 圭亮, 小野寺 真奈, 鈴木 友裕, 高橋 拓己, 一ツ木 康晶, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 19 (1) 2-10 2020/06

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

  120. 新型0.07mm鉛当量防護眼鏡のIVR臨床における基礎的検討

    遠藤 美芽, 大友 一輝, 村林 優樹, 芳賀 喜裕, 阿部 美津也, 加賀 勇治, 稲葉 洋平, 千田 浩一

    日本保健物理学会研究発表会講演要旨集 53回 58-58 2020/06

    Publisher: (一社)日本保健物理学会

  121. 診療放射線技師の被曝防護の実態調査 ポータブルX線撮影に関するアンケートによる検討

    大友 一輝, 遠藤 美芽, 村林 優樹, 安部 圭亮, 小野寺 真奈, 鈴木 友裕, 高橋 拓己, 一ツ木 康晶, 稲葉 洋平, 千田 浩一

    日本保健物理学会研究発表会講演要旨集 53回 61-61 2020/06

    Publisher: (一社)日本保健物理学会

  122. Development of Novel Real-Time Radiation Systems Using 4-Channel Sensors. International-journal Peer-reviewed

    Yohei Inaba, Masaaki Nakamura, Masayuki Zuguchi, Koichi Chida

    Sensors (Basel, Switzerland) 20 (9) 2020/05/11

    DOI: 10.3390/s20092741  

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    Radiation-related tissue injuries after medical radiation procedures, such as fluoroscopically guided intervention (FGI), have been reported in patients. Real-time monitoring of medical radiation exposure administered to patients during FGI is important to avoid such tissue injuries. In our previous study, we reported a novel (prototype) real-time radiation system for FGI. However, the prototype sensor indicated low sensitivity to radiation exposure from the side and back, although it had high-quality fundamental characteristics. Therefore, we developed a novel 4-channel sensor with modified shape and size than the previous sensor, and evaluated the basic performance (i.e., measured the energy, dose linearity, dose rate, and angular dependence) of the novel and previous sensors. Both sensors of our real-time dosimeter system demonstrated the low energy dependence, excellent dose linearity (R2 = 1.0000), and good dose rate dependence (i.e., within 5% statistical difference). Besides, the sensitivity of 0° ± 180° in the horizontal and vertical directions was almost 100% sensitivity for the new sensor, which significantly improved the angular dependence. Moreover, the novel dosimeter exerted less influence on X-ray images (fluoroscopy) than other sensors because of modifying a small shape and size. Therefore, the developed dosimeter system is expected to be useful for measuring the exposure of patients to radiation doses during FGI procedures.

  123. Cohort Profile: Tohoku Medical Megabank Project Birth and Three-Generation Cohort Study (TMM BirThree Cohort Study): rationale, progress and perspective. International-journal Peer-reviewed

    Shinichi Kuriyama, Hirohito Metoki, Masahiro Kikuya, Taku Obara, Mami Ishikuro, Chizuru Yamanaka, Masato Nagai, Hiroko Matsubara, Tomoko Kobayashi, Junichi Sugawara, Gen Tamiya, Atsushi Hozawa, Naoki Nakaya, Naho Tsuchiya, Tomohiro Nakamura, Akira Narita, Mana Kogure, Takumi Hirata, Ichiro Tsuji, Fuji Nagami, Nobuo Fuse, Tomohiko Arai, Yoshio Kawaguchi, Shinichi Higuchi, Masaki Sakaida, Yoichi Suzuki, Noriko Osumi, Keiko Nakayama, Kiyoshi Ito, Shinichi Egawa, Koichi Chida, Eiichi Kodama, Hideyasu Kiyomoto, Tadashi Ishii, Akito Tsuboi, Hiroaki Tomita, Yasuyuki Taki, Hiroshi Kawame, Kichiya Suzuki, Naoto Ishii, Soichi Ogishima, Satoshi Mizuno, Takako Takai-Igarashi, Naoko Minegishi, Jun Yasuda, Kazuhiko Igarashi, Ritsuko Shimizu, Masao Nagasaki, Osamu Tanabe, Seizo Koshiba, Hiroaki Hashizume, Hozumi Motohashi, Teiji Tominaga, Sadayoshi Ito, Kozo Tanno, Kiyomi Sakata, Atsushi Shimizu, Jiro Hitomi, Makoto Sasaki, Kengo Kinoshita, Hiroshi Tanaka, Tadao Kobayashi, Shigeo Kure, Nobuo Yaegashi, Masayuki Yamamoto

    International journal of epidemiology 49 (1) 18-19 2020/02/01

    DOI: 10.1093/ije/dyz169  

  124. Identification of Potential Biomarkers of Radiation Exposure in Blood Cells by Capillary Electrophoresis Time-of-Flight Mass Spectrometry. International-journal Peer-reviewed

    Lue Sun, Yohei Inaba, Norie Kanzaki, Mahesh Bekal, Koichi Chida, Takashi Moritake

    International journal of molecular sciences 21 (3) 2020/01/27

    DOI: 10.3390/ijms21030812  

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    Biodosimetry is a useful method for estimating personal exposure doses to ionizing radiation. Studies have identified metabolites in non-cellular biofluids that can be used as markers in biodosimetry. Levels of metabolites in blood cells may reflect health status or environmental stresses differentially. Here, we report changes in the levels of murine blood cell metabolites following exposure to X-rays in vivo. Levels of blood cell metabolites were measured by capillary electrophoresis time-of-flight mass spectrometry. The levels of 100 metabolites were altered substantially following exposure. We identified 2-aminobutyric acid, 2'-deoxycytidine, and choline as potentially useful markers of radiation exposure and established a potential prediction panel of the exposure dose using stepwise regression. Levels of blood cell metabolites may be useful biomarkers in estimating exposure doses during unexpected radiation incidents.

  125. わが国の循環器血管撮影領域における医療被ばくの実態調査 Peer-reviewed

    石橋 徹, 竹井 泰孝, 坂本 肇, 山下 由香利, 加藤 守, 塚本 篤子, 松本 一真, 水谷 宏, 鈴木 昇一, 加藤 洋, 千田 浩一

    日本放射線技術学会雑誌 76 (1) 64-71 2020/01

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

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    循環器血管撮影領域における患者被ばく線量の実態を把握するため、全国規模のアンケート調査を実施した。日本放射線技術学会員が在籍する施設のうち、日本心血管インターベンション治療学会研修関連施設、小児循環器学会修練施設、日本不整脈心電学会認定研修施設のいずれかを含む765施設を対象として、郵送にてアンケート用紙を送付した。検査項目は、循環器撮影領域を中心とした冠動脈造影(CAG)、冠動脈インターベンション(PCI)、高周波カテーテルアブレーション(RFCA)、小児カテーテル検査・治療(Pediatric)の4分類とした。各検査項目別の患者照射基準点における透視線量率は、CAG群(98施設)では50%タイル値12.5mGy/min、75%タイル値17.9mGy/minであった。PCI群(98施設)では50%タイル値13.1mGy/min、75%タイル値17.7mGy/minでありCAG群とPCI群はほぼ同等の値を示した。次にRFCA群(65施設)では50%タイル値4.60mGy/min、75%タイル値7.50mGy/minとなり、Pediatric群(22施設)では50%タイル値6.88mGy/min、75%タイル値9.70mGy/minであった。2015年6月に医療被ばく研究情報ネットワークが報告した診断参考レベル(DRLs2015)が示している20mGy/minと比較すると、CAG、PCI群では若干低値を示し、RFCA群やPediatric群では大幅に低値を示していた。

  126. [Evaluating Eye Lens Dose of Neurovascular and Cardiac Electrophysiology Interventional Physician].

    Mamoru Kato, Koichi Chida, Takato Ishida, Fumiaki Sasaki, Hideto Toyoshima, Hajime Osaka, Toshibumi Kinoshita

    Nihon Hoshasen Gijutsu Gakkai zasshi 76 (1) 26-33 2020

    DOI: 10.6009/jjrt.2020_JSRT_76.1.26  

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    PURPOSE: The International Commission on Radiological Protection recommended that interventional radiologies (IRs) have high radiation doses and that staff may also be exposed to high doses. In the present study, we measured the radiation exposure dose [3 mm dose equivalent, Hp (3) ] in the eye using an appropriate dosimeter placed next to the physician' s eye during neurovascular intervention procedure (Neuro-IR) and interventional cardiac electrophysiology procedure (EP-IR). METHOD: Physicians wore a direct eye dosemeter just lateral to the left eye and an additional direct eye dosemeter outside the radiation protective glasses close to their left eye. Additionally, a neck badge [0.07 mm dose equivalent, Hp (0.07) ] was worn outside the protective apron to the left of the neck, to compare the direct eye dosimeter estimated doses. The occupational eye lens dose was evaluated over a period of 6-month. RESULTS: The maximum Hp (3) of the Neuro-IR physician was estimated 5.1 mSv without the radiation protective glasses and 1.6 mSv with the radiation protective glasses. On the other hand, the maximum Hp (3) of the EP-IR physician was estimated 29 mSv without the radiation protective glasses and 15 mSv with the radiation protective glasses. CONCLUSION: Physicians eye lens dose [Hp (3) ] tended to be overestimated by the neck badge measurements [Hp (0.07)]. A correct evaluation of the lens dose [Hp (3) ] using the direct eye dosimeter is recommended. Although we found a positive correlation between Hp (0.07) and Hp (3), the value of R2 in the regression equation is low, we recommended that the eye lens dose estimated carefully from Hp (0.07).

  127. 空間散乱線量の測定に関する基礎検討 種々のファントムによる比較検討

    巻 周星, 石沢 祥子, 大森 悠斗, 川口 和奏, 山田 芙美佳, 大友 一輝, 芳賀 喜裕, 阿部 美津也, 加賀 勇治, 千田 浩一, 稲葉 洋平

    日本放射線技術学会東北部会雑誌 (29) 180-181 2020/01

    Publisher: (公社)日本放射線技術学会-東北支部

  128. 無線通信機能付きリアルタイム患者被曝線量計の試作

    石沢 祥子, 巻 周星, 山田 芙美佳, 川口 和奏, 大森 悠斗, 村林 優樹, 大友 一輝, 遠藤 美芽, 芳賀 喜裕, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北部会雑誌 (29) 182-183 2020/01

    Publisher: (公社)日本放射線技術学会-東北支部

  129. 【胸部の最新画像情報2020】心臓IVR手技における0.75mmPb当量防護眼鏡の遮蔽効果に関する臨床的検討 Peer-reviewed

    遠藤 美芽, 芳賀 喜裕, 阿部 美津也, 加賀 勇治, 大友 一輝, 村林 優樹, 稲葉 洋平, 千田 浩一

    臨床放射線 65 (1) 71-75 2020/01

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    0.75mmPb当量の防護眼鏡を装着し、IVR手技を行った医師と診療放射線技師の水晶体被曝線量の測定を行った。当院の心臓IVRスタッフ(医師2名と診療放射線技師1名)を対象とした。医師2名については2018年2月の1ヵ月のみ、診療放射線技師1名については2018年3月〜12月の10ヵ月間測定を行った。医師1、医師2とも防護眼鏡の遮蔽率はおおむね同等であり約83%となった。一方、診療放射線技師の水晶体線量と防護眼鏡による遮蔽率に関して、防護眼鏡の遮蔽率はおおむね80%程度の値を示す月が多かった。しかし、2018年6月に関しては遮蔽率が62.5%となっており、ほかの測定月より遮蔽率が有意に低い値を示した。原因として、測定したそもそもの線量値がほかの月と比較して低く、測定誤差が大きくなったことが考えられた。測定を実施した10ヵ月における平均遮蔽率は78.4%となった。

  130. OCCUPATIONAL RADIATION EXPOSURE DOSE OF THE EYE IN DEPARTMENT OF CARDIAC ARRHYTHMIA PHYSICIAN. International-journal

    Mamoru Kato, Koichi Chida, Takato Ishida, Fumiaki Sasaki, Hideto Toyoshima, Hajime Oosaka, Ken Terata, Yoshihisa Abe, Toshibumi Kinoshita

    Radiation protection dosimetry 187 (3) 361-368 2019/12/31

    DOI: 10.1093/rpd/ncz175  

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    Interventional radiology (IR) procedures tend to be complex, which delivers high radiation exposure to patient. In the present study, we measured the radiation exposure dose [Hp(3)] in the eye using a direct eye dosemeter placed next to the physician's eye during procedures. Physicians wore a direct eye dosemeter just lateral to eyes and an additional direct eye dosemeter outside the radiation protective eyeglasses close to their eyes. Additionally, a neck glass badge was worn at the neck. Although we found a positive correlation between the left neck glass badge dose [Hp(0.07)] and the left eye lens dose [Hp(3)], the value of R2 of the regression equation were 0.62 and 0.71 (outside and inside). We thought that the exact eye lens dose might not be estimated from the neck glass badge. In conclusion, a correct evaluation of the lens dose [Hp(3)] using the direct eye dosemeter is recommended for tachyarrhythmia physicians.

  131. A phantom study to determine the optimal placement of eye dosemeters on interventional cardiology staff Peer-reviewed

    H. Ishii, K. Chida, K. Satsurai, Y. Haga, Y. Kaga, M. Abe, Y. Inaba, M. Zuguchi

    Radiation Protection Dosimetry 185 (4) 409-413 2019/12/31

    DOI: 10.1093/rpd/ncz027  

    ISSN: 0144-8420

    eISSN: 1742-3406

  132. OCCUPATIONAL RADIATION EXPOSURE OF THE EYE IN NEUROVASCULAR INTERVENTIONAL PHYSICIAN. International-journal

    Mamoru Kato, Koichi Chida, Takato Ishida, Hideto Toyoshima, Yasuyuki Yoshida, Shotaro Yoshioka, Junta Moroi, Toshibumi Kinoshita

    Radiation protection dosimetry 185 (2) 151-156 2019/12/23

    DOI: 10.1093/rpd/ncy285  

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    Neurovascular interventional radiology (neuro-IR) procedures tend to require an extended fluoroscopic exposure time and repeated digital subtraction angiography. To evaluate the actual measurement of eye lens dose using a direct eye dosemeter in neuro-IR physicians is important. Direct dosimetry using the DOSIRIS™ (IRSN, France) [3 mm dose equivalent, Hp(3)] was performed on 86 cases. Additionally, a neck personal dosemeter (glass badge) [0.07 mm dose equivalent, Hp(0.07)] was worn outside the protective apron to the left of the neck. The average doses per case of neuro-IR physicians were 0.04 mSv/case and 0.02 mSv/case, outside and inside the radiation protection glasses, respectively. The protective effect of radiation protection glasses was approximately 60%. The physician eye lens dose tended to be overestimated by the neck glass badge measurements. A correct evaluation of the lens dose [Hp(3)] using an eye dosemeter such as DOSIRIS™ is needed for neuro-IR physicians.

  133. ポータブルX線撮影に携わる診療放射線技師の水晶体線量評価

    大友 一輝, 芳賀 善裕, 曽田 真宏, 阿部 美津也, 加賀 勇治, 遠藤 美芽, 村林 優樹, 千田 浩一

    日本放射線技術学会雑誌 75 (9) 968-968 2019/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  134. Performance of the DOSIRIS™ eye lens dosimeter. International-journal Peer-reviewed

    Hiroki Ishii, Yoshihiro Haga, Masahiro Sota, Yohei Inaba, Koichi Chida

    Journal of radiological protection : official journal of the Society for Radiological Protection 39 (3) N19-N26 2019/09

    DOI: 10.1088/1361-6498/ab2729  

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    Monitoring and protecting of occupational eye doses in interventional radiology (IR) are very important matters. DOSIRIS™ is the useful solution to estimate the 3 mm dose-equivalent (Hp(3)), and it can be worn behind lead glasses. And DOSIRIS™, adjustable according to 3 axes, it is ideally placed as close to the eye and in contact with the skin. So, DOSIRIS™ will be suitable eye lens dosimeter. However, the fundamental characteristics of the DOSIRIS™ in the diagnostic x-ray energy domain (including that of IR x-ray systems) remain unclear. Here, we evaluated the performance of the dosimeter in that energy range. As a result, the DOSIRIS™ has good fundamental characteristics (batch uniformity, dose linearity, energy dependence, and angular dependence) in the diagnostic x-ray energy domain. We conclude that the DOSIRIS™ has satisfactory basic performance for occupational eye dosimetry in diagnostic x-ray energy settings (including IR x-ray systems).

  135. ESTIMATION OF PATIENT LENS DOSE ASSOCIATED WITH C-ARM CONE-BEAM COMPUTED TOMOGRAPHY USAGE DURING INTERVENTIONAL NEURORADIOLOGY. International-journal

    Satoru Kawauchi, Koichi Chida, Takashi Moritake, Yuji Matsumaru, Yusuke Hamada, Hideyuki Sakuma, Shogo Yoda, Lue Sun, Masayuki Sato, Wataro Tsuruta

    Radiation protection dosimetry 184 (2) 138-147 2019/08/01

    DOI: 10.1093/rpd/ncy188  

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    The purpose of this study was to investigate the dose distribution and lens doses associated with C-arm cone-beam computed tomography (CBCT), using a head phantom, and to estimate the contribution ratio of C-arm CBCT to each patient's lens dose during interventional neuroradiology ('lens dose ratio') in 109 clinical cases. In the phantom study, the peak skin doses and respective right and left lens doses of C-arm CBCT were as follows: 63.0 ± 1.9 mGy, 19.7 ± 1.4 mGy and 21.9 ± 0.8 mGy in whole brain C-arm CBCT and 39.2 ± 1.4 mGy, 4.7 ± 0.9 mGy and 3.6 ± 0.3 mGy in high-resolution C-arm CBCT. In the clinical study, the lens dose ratios were 25.4 ± 8.7% in the right lens and 19.1 ± 9.8% in the left lens. This study shows that, on average, ~25% of patients' total lens dose was contributed by C-arm CBCT.

  136. New real-time patient radiation dosimeter for use in radiofrequency catheter ablation. International-journal

    Mamoru Kato, Koichi Chida, Masaaki Nakamura, Hideto Toyoshima, Ken Terata, Yoshihisa Abe

    Journal of radiation research 60 (2) 215-220 2019/03/01

    DOI: 10.1093/jrr/rry110  

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    In a previous study, we reported on a novel (prototype) real-time patient dosimeter with non-toxic phosphor sensors. In this study, we developed new types of sensors that were smaller than in the previous prototype, and clarified the clinical feasibility of our newly proposed dosimeter. Patient dose measurements obtained with the newly proposed real-time dosimeter were compared with measurements obtained using a calibrated radiophotoluminescence glass reference dosimeter (RPLD). The reference dosimeters were set at almost the same positions as the new real-time dosimeter sensors. We found excellent correlations between the reference RPLD measurements and those obtained using our new real-time dosimeter (r2 = 0.967). However, the new type of dosimeter was found to underestimate radiation skin dose measurements when compared with an RPLD. The most probable reason for this was the size reduction in the phosphor sensor of the new type of dosimeter. We believe that, as a result of reducing the phosphor sensor size, the backscattered X-ray irradiation was underestimated. However, the new dosimeter can accurately determine the absorbed dose by correcting the measured value with calibration factors. The calibration factor for the new type dosimeter was determined (by linear regression) to be ~1.15. New real-time patient dosimeter design would be an effective tool for the real-time measurement of patient skin doses during interventional radiology treatments.

  137. 心血管IVRに携わるスタッフの水晶体線量評価 リアルタイム線量測定による基礎検討

    石井 浩生, 薩來 康, 芳賀 喜裕, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北支部雑誌 (28) 173-174 2019/01

    Publisher: (公社)日本放射線技術学会-東北支部

  138. 空間散乱X線測定による実効エネルギー変換係数の算出

    薩來 康, 石井 浩生, 千田 浩一, 稲葉 洋平, 芳賀 喜裕, 加賀 勇治

    日本放射線技術学会東北支部雑誌 (28) 233-234 2019/01

    Publisher: (公社)日本放射線技術学会-東北支部

  139. The effectiveness of additional lead-shielding drape and low pulse rate fluoroscopy in protecting staff from scatter radiation during cardiac resynchronization therapy (CRT)

    Yoshiaki Morishima, Koichi Chida, Yoshiaki Katahira

    Japanese Journal of Radiology 37 (1) 95-101 2019/01

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1007/s11604-018-0783-7  

    ISSN: 1867-1071

    eISSN: 1867-108X

  140. Effectiveness of a novel real-time dosimeter in interventional radiology: a comparison of new and old radiation sensors. Peer-reviewed

    Inaba Y, Nakamura M, Chida K, Zuguchi M

    Radiological physics and technology 11 (4) 445-450 2018/12

    DOI: 10.1007/s12194-018-0484-z  

    ISSN: 1865-0333

    eISSN: 1865-0341

  141. 半導体式サーベイメータの散乱X線平均エネルギー測定精度の基礎検討 Peer-reviewed

    薩來 康, 石井 浩生, 芳賀 喜裕, 加賀 勇治, 佐藤 文貴, 本田 崇文, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 17 (2) 114-120 2018/11

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

  142. 胸部CTにおけるOrgan Effective Modulationを用いた乳腺表面線量の測定 Clinical study

    太田 丞二, 鈴木 柚香, 入江 亮介, 滝嶋 葉月, 横田 元, 堀越 琢郎, 千田 浩一, 桝田 喜正

    日本放射線技術学会雑誌 74 (9) 1088-1088 2018/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  143. 血管造影・IVRに携わる医療従事者の水晶体線量の左右差に関する基礎検討

    石井 浩生, 薩來 康, 佐藤 文貴, 本田 崇文, 芳賀 喜裕, 加賀 勇治, 稲葉 洋平, 千田 浩一

    日本保健物理学会研究発表会講演要旨集 51回 53-53 2018/06

    Publisher: (一社)日本保健物理学会

  144. 水晶体被ばく防護における基礎検討 空間散乱X線平均エネルギー測定の検討

    薩來 康, 石井 浩生, 本田 崇文, 佐藤 文貴, 稲葉 洋平, 千田 浩一

    日本保健物理学会研究発表会講演要旨集 51回 59-59 2018/06

    Publisher: (一社)日本保健物理学会

  145. Dose-dependent decrease in anti-oxidant capacity of whole blood after irradiation: A novel potential marker for biodosimetry

    Sun, Lue, Inaba, Yohei, Sato, Keizo, Hirayama, Aki, Tsuboi, Koji, Okazaki, Ryuji, Chida, Koichi, Moritake, Takashi

    Scientific reports 8 (1) 7425 2018/05

    DOI: 10.1038/s41598-018-25650-y  

    ISSN: 2045-2322

  146. 新型半導体式サーベイメータの基本特性に関する検討 Peer-reviewed

    石井 浩生, 薩來 康, 上杉 直人, 加藤 槙子, 三戸 麻莉菜, 宮田 恒平, 稲葉 洋平, 千田 浩一

    日本放射線安全管理学会誌 17 (1) 2-8 2018/05

    Publisher: (一社)日本放射線安全管理学会

    ISSN: 1347-1503

  147. Effectiveness of additional lead shielding to protect staff from scattering radiation during endoscopic retrograde cholangiopancreatography procedures

    Yoshiaki Morishima, Koichi Chida, Takayoshi Meguro

    Journal of Radiation Research 59 (2) 225-232 2018/03/01

    Publisher: Oxford University Press

    DOI: 10.1093/jrr/rrx039  

    ISSN: 1349-9157 0449-3060

  148. Effectiveness of a New Lead-Shielding Device and Additional Filter for Reducing Staff and Patient Radiation Exposure During Videofluoroscopic Swallowing Study Using a Human Phantom

    Yoshiaki Morishima, Koichi Chida, Yoshikazu Muroya, Yoshiya Utsumi

    Dysphagia 33 (1) 109-114 2018/02/01

    Publisher: Springer New York LLC

    DOI: 10.1007/s00455-017-9839-6  

    ISSN: 1432-0460 0179-051X

  149. 二種類の異なる半導体式サーベイセンサの基本特性比較 Peer-reviewed

    石井 浩生, 薩來 康, 上杉 直人, 加藤 槙子, 三戸 麻莉菜, 宮田 恒平, 芳賀 喜裕, 稲葉 洋平, 千田 浩一

    東北大学医学部保健学科紀要 27 (1) 43-50 2018/01

    Publisher: 東北大学医学部保健学科

    ISSN: 1348-8899

  150. Occupational eye dose in interventional cardiology procedures

    Yoshihiro Haga, Koichi Chida, Yuji Kaga, Masahiro Sota, Taiichiro Meguro, Masayuki Zuguchi

    Scientific Reports 7 (1) 2017/12/01

    Publisher: Nature Publishing Group

    DOI: 10.1038/s41598-017-00556-3  

    ISSN: 2045-2322

  151. JSNET防護委員会で今後行うDRL調査について

    川内 覚, 松丸 祐司, 盛武 敬, 安陪 等思, 庄島 正明, 早川 幹人, 坂本 肇, 人見 剛, 濱田 祐介, 鶴田 和太郎, 千田 浩一, 田野 政勝

    脳血管内治療 2 (Suppl.) S354-S354 2017/11

    Publisher: (NPO)日本脳神経血管内治療学会

    ISSN: 2423-9119

    eISSN: 2424-1709

  152. 電子スピン共鳴法を用いた被ばく後の酸化ストレスレベルの測定 Peer-reviewed

    孫 略, 稲葉 洋平, 佐藤 圭創, 平山 暁, 坪井 康次, 千田 浩一, 盛武 敬

    日本放射線影響学会大会講演要旨集 60回 117-117 2017/10

    Publisher: (一社)日本放射線影響学会

    ISSN: 1347-8680

  153. Fetal dose conversion factor for fetal computed tomography examinations: A mathematical phantom study. International-journal

    Yuta Matsunaga, Ai Kawaguchi, Masanao Kobayashi, Shoichi Suzuki, Yasuki Asada, Kiyoshi Ito, Koichi Chida

    Journal of applied clinical medical physics 18 (5) 330-335 2017/09

    DOI: 10.1002/acm2.12154  

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    This study aimed to examine the relationship between fetal dose and the dose-length product, and to evaluate the impact of the number of rotations on the fetal doses and maternal effective doses using a 320-row multidetector computed tomography unit in a wide-volume mode. The radiation doses for the pregnant woman and the fetus were estimated using ImPACT CT Patient Dosimetry Calculator software for scan lengths ranging from 176 to 352 mm, using a 320-row unit in a wide-volume mode and an 80-row unit in a helical scanning mode. In the 320-row unit, the fetal doses in all scan lengths ranged from 3.51 to 6.52 mGy; the maternal effective doses in all scan lengths ranged from 1.05 to 2.35 mSv. In the 80-row unit, the fetal doses in all scan lengths ranged from 2.50 to 3.30 mGy; the maternal effective doses in all scan lengths ranged from 0.83 to 1.68 mSv. The estimated conversion factors from the dose-length product (mGy・cm) to fetal doses (mGy) for the 320-row unit in wide-volume mode and the 80-row unit in helical scanning mode were 0.06 and 0.05 (cm-1 ) respectively. While using a 320-row MDCT unit in a wide-volume mode, operators must take into account the number of rotations, the beam width as automatically determined by the scanner, the placement of overlap between volumetric sections, and the ratio of overlapping volumetric sections.

  154. IVR-CT装置によるCT透視時の空間散乱線分布に関する基礎検討 Peer-reviewed

    本田 崇文, 佐藤 文貴, 石井 浩生, 稲葉 洋平, 常陸 真, 立花 茂, 梁川 功, 千田 浩一

    臨床放射線 62 (8) 1099-1104 2017/08

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    人体ファントムを用いてinterventional radiology(IVR)-CT装置で骨盤部のCT透視を行った際の散乱線を測定し、空間散乱線分布について検討した。使用機器はRaySafe i2(Unfors Ray-Safe社製)で、測定点はCTガントリ中心から60cm刻みの計19点、高さは100cm、150cm、200cmの3点とし、CT透視下生検での寝台位置であるoff-centerと診断のCT撮影での寝台位置であるon-centerについて比較した。その結果、散乱線量が最も高かった測定点はCTガントリ・ボア近傍で、高さによる線量の変化やon-centerとoff-centerによる傾向差はみられず、天吊り防護板による遮蔽率はその位置によって大きく異なった。CT透視下生検に携わる医師・看護師の水晶体被曝防護の必要性が示された。

  155. Radiation doses for pregnant women in the late pregnancy undergoing fetal-computed tomography: a comparison of dosimetry and Monte Carlo simulations. Peer-reviewed

    Yuta Matsunaga, Ai Kawaguchi, Masanao Kobayashi, Shigetaka Suzuki, Shoichi Suzuki, Koichi Chida

    Radiological physics and technology 10 (2) 148-154 2017/06

    Publisher: Springer Tokyo

    DOI: 10.1007/s12194-016-0377-y  

    ISSN: 1865-0341 1865-0333

  156. DIRECT DOSE MEASUREMENT ON PATIENT DURING PERCUTANEOUS CORONARY INTERVENTION PROCEDURES USING RADIOPHOTOLUMINESCENCE GLASS DOSIMETERS Peer-reviewed

    Mamoru Kato, Koichi Chida, Takashi Moritake, Tadaya Sato, Hajime Oosaka, Hideto Toyoshima, Masayuki Zuguchi, Yoshihisa Abe

    RADIATION PROTECTION DOSIMETRY 175 (1) 31-37 2017/06

    DOI: 10.1093/rpd/ncw263  

    ISSN: 0144-8420

    eISSN: 1742-3406

  157. Red-emission phosphor's brightness deterioration by x-ray and brightness recovery phenomenon by heating Peer-reviewed

    Masaaki Nakamura, Koichi Chida, Yohei Inaba, Ryota Kobayashi, Masayuki Zuguchi

    JOURNAL OF RADIOLOGICAL PROTECTION 37 (2) N19-N26 2017/06

    DOI: 10.1088/1361-6498/aa6272  

    ISSN: 0952-4746

    eISSN: 1361-6498

  158. Comparison of x-ray radiation dose of the biplane and the single-plane in the cardiac angiography and percutaneous coronary intervention

    Takeda Kazuya, Chida Koichi, Tobaru Tetsuya, Takayama Morimasa, Takanashi Shuichiro

    Journal of the Japanese Coronary Association 97-101 2017

    Publisher: The Japanese Coronary Association

    DOI: 10.7793/jcoron.23.16-00022  

    ISSN: 1341-7703

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    We investigated the difference in radiation dose between the two imaging technique by dividing the patients undergoing cardiac angiography a (857 cases) and coronary intervention (142 cases) into the biplane group and the single-plane group to Fluoroscopy time, fluoroscopy dose, number of cineangiography runs, cineangiography dose, total dose and amount of contrast media were compared and examined in the both groups. In the cardiac angiography, 487 cases in the biplane group were significantly higher in fluoroscopy time, fluoroscopy dose, number of cineangiography, fluoroscopy dose, cineangiography dose and total dose than 370 cases in the single-plane group while the contrast load used was significantly lower. Also in coronary intervention, 37 cases in the biplane group showed significantly higher fluoroscopy time, fluoroscopy dose, number of cineangiography runs, cineangiography dose and total dose than 105 cases in the single-plane group, however there was no difference in amount of contrast media. Since biplane imaging leads to increase the radiation dose, we should select imaging technique according to the procedure and patient condition.

  159. リアルタイム型MOSFET線量計の基本特性評価 Peer-reviewed

    佐藤 文貴, 本田 崇文, 芳賀 喜裕, 稲葉 洋平, 加賀 勇治, 千田 浩一

    東北大学医学部保健学科紀要 26 (1) 57-65 2017/01

    Publisher: 東北大学医学部保健学科

    ISSN: 1348-8899

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    Interventional radiology(IVR)は近年急速に発展しているが、手技が複雑になるにつれて透視時間の延長や撮影回数の増加が生じるため、被曝線量は増加傾向にある。患者の被曝線量を評価する方法には直接測定法と間接的測定法があるが、患者皮膚入射線量を直接かつリアルタイムに測定できるものは少ない。リアルタイム線量計としては以前、Skin Dose Monitor(SDM)線量計が普及していたが、センサーが1つしかなく、かつセンサーに毒性の強いカドミウム蛍光体を使用していたため、現在は製造が中止されている。このほかPatient Skin Dosimeterも開発されたが、検出部と信号ケーブルがX線画像に映り込むためIVRでは使用されていない。今回、患者入射皮膚線量を直接かつリアルタイムに測定可能なMOSFET(mobile Metal Oxide Semiconductor Field Effect Transistor)線量計を使用する機会を得、放射線治療時だけでなくIVRにおいても使用可能か否か、SDM線量計と比較しつつ検討した。結果、IVR時の患者被曝線量測定に使用可能であることが示唆された。

  160. Real-time patient radiation dosimeter for use in interventional radiology. Peer-reviewed

    Chida K, Kato M, Inaba Y, Kobayashi R, Nakamura M, Abe Y, Zuguchi M

    Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) 32 (11) 1475-1478 2016/11

    DOI: 10.1016/j.ejmp.2016.10.013  

    ISSN: 1120-1797

    eISSN: 1724-191X

  161. The Tohoku Medical Megabank Project: Design and Mission

    Shinichi Kuriyama, Nobuo Yaegashi, Fuji Nagami, Tomohiko Arai, Yoshio Kawaguchi, Noriko Osumi, Masaki Sakaida, Yoichi Suzuki, Keiko Nakayama, Hiroaki Hashizume, Gen Tamiya, Hiroshi Kawame, Kichiya Suzuki, Atsushi Hozawa, Naoki Nakaya, Masahiro Kikuya, Hirohito Metoki, Ichiro Tsuji, Nobuo Fuse, Hideyasu Kiyomoto, Junichi Sugawara, Akito Tsuboi, Shinichi Egawa, Kiyoshi Ito, Koichi Chida, Tadashi Ishii, Hiroaki Tomita, Yasuyuki Taki, Naoko Minegishi, Naoto Ishii, Jun Yasuda, Kazuhiko Igarashi, Ritsuko Shimizu, Masao Nagasaki, Seizo Koshiba, Kengo Kinoshita, Soichi Ogishima, Takako Takai-Igarashi, Teiji Tominaga, Osamu Tanabe, Noriaki Ohuchi, Toru Shimosegawa, Shigeo Kure, Hiroshi Tanaka, Sadayoshi Ito, Jiro Hitomi, Kozo Tanno, Motoyuki Nakamura, Kuniaki Ogasawara, Seiichiro Kobayashi, Kiyomi Sakata, Mamoru Satoh, Atsushi Shimizu, Makoto Sasaki, Ryujin Endo, Kenji Sobue, Masayuki Yamamoto

    JOURNAL OF EPIDEMIOLOGY 26 (9) 493-511 2016/09

    DOI: 10.2188/jea.JE20150268  

    ISSN: 0917-5040

  162. Estimation of the Dose of Radiation Received by Patient and Physician During a Videofluoroscopic Swallowing Study Peer-reviewed

    Yoshiaki Morishima, Koichi Chida, Hiroshi Watanabe

    DYSPHAGIA 31 (4) 574-578 2016/08

    DOI: 10.1007/s00455-016-9718-6  

    ISSN: 0179-051X

    eISSN: 1432-0460

  163. 多施設IVR装置における実測に基づいた透視線量率の現状 DRLs 2015との乖離 Peer-reviewed

    稲葉 洋平, 小林 亮太, 千田 浩一

    日本放射線技術学会雑誌 72 (8) 689-694 2016/08

    Publisher: (公社)日本放射線技術学会

    DOI: 10.6009/jjrt.2016_JSRT_72.8.689  

    ISSN: 0369-4305

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    宮城県内で多数経皮的インターベンション(PCI)を行っている施設で線量測定の同意が得られた13施設18装置を対象に、多施設インターベンショナルラジオロジー(IVR)装置における実測に基づいた透視線量率の現状について検討した。IVR認定技師がいない施設も測定対象に、含めた結果、DRLs2015を満たしたのは3割にも満たないことが明らかになった。この結果は、日本における多くの施設の実態を表している可能性があり、現状のDRLs2015とは乖離があることが示唆された。各施設での線量測定とDRLs2015が活用した線量最適化は可及的に速やかに行う必要があると思われた。

  164. Present Situation of Fluoroscopy Radiation Doses in Many IVR Systems. Peer-reviewed

    Inaba Y, Kobayashi R, Chida K

    Nihon Hoshasen Gijutsu Gakkai zasshi 72 (8) 689-694 2016/08

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.2016_JSRT_72.8.689  

    ISSN: 0369-4305

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    <p>Japan Network for Research and Information on Medical Exposures (J-RIME) released the primary diagnostic reference levels (DRLs 2015) to optimize/manage the radiation dose for interventional radiology (IVR) on June 7, 2015 in Japan. However, this DRLs 2015 has a wide range of selection bias for only certified IVR technologists' dates. Therefore, it is important to know the radiation dose including non-certified IVR technologists' facilities. In this study, we verified the fluoroscopy radiation dose rates for many IVR systems in the present situation. This study was conducted at 13 cardiac catheterization laboratories (18 X-ray systems) around Sendai. We measured the entrance doses at the patient entrance reference point (interventional reference point) using a 20-cm-thick acrylic plate and skin-dose monitor. Although the DRLs 2015 of IVR is 20 mGy/min, the result of a fluoroscopy radiation dose in 18 X-ray systems was median (inter quartile range: IQR), 24.4 (16.3, 35.5) mGy/min. The optimization/managing the radiation dose of IVR X-ray systems is an important issue. In addition, it is necessary to intensify the activities to raise awareness for DRLs 2015.</p>

  165. A cross-sectional study of the radiation dose and image quality of X-ray equipment used in IVR. Peer-reviewed

    Inaba Y, Chida K, Kobayashi R, Zuguchi M

    Journal of applied clinical medical physics 17 (4) 391-401 2016/07

    DOI: 10.1120/jacmp.v17i4.6231  

    eISSN: 1526-9914

  166. Clinical and volumetric prognostic factors in external beam radiotherapy for head and neck cancer Peer-reviewed

    K. Takeda, H. Matsushita, T. Ogawa, S. Dobashi, Y. Ishizawa, K. Chida, N. Kadoya, K. Ito, M. Chiba, M. Kubozono, R. Umezawa, Y. Shirata, Y. Ishikawa, T. Yamamoto, M. Kozumi, T. Tanabe, N. Takahashi, Y. Katagiri, S. Tazaka, K. Takeda, K. Sato, Y. Katori, K. Jingu

    Radiother Oncol 119 (1) 504-505 2016/04

  167. Dose evaluation for foetal computed tomography with a 320-row unit in wide-volume mode and an 80-row unit in helical scanning mode: a phantom study. International-journal Peer-reviewed

    Yuta Matsunaga, Ai Kawaguchi, Masanao Kobayashi, Shigetaka Suzuki, Shoichi Suzuki, Koichi Chida

    Radiation protection dosimetry 168 (4) 523-30 2016/03

    DOI: 10.1093/rpd/ncv374  

    ISSN: 0144-8420

    eISSN: 1742-3406

  168. 心血管IVR装置における多施設線量比較 Peer-reviewed

    稲葉 洋平, 小林 亮太, 千田 浩一

    臨床放射線 61 (3) 483-490 2016/03

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    心血管IVR(Interventional Radiology)を行う仙台市内13施設の装置18台について、2007年と2014年におけるアクリルファントム入射表面線量を横断的に比較評価した。全装置間の2007年/2014年の透視線量(平均値:mGy/min)は15.9/13.9と減少したが、最大線量較差は7.4倍/13.4倍と大きくなった。撮影線量(平均値:mGy/10sec)は29.9/24.6と減少したが、線量較差は7.4倍/9.7倍と大きくなった。施設間の比較では、透視は9施設が減少傾向を示し、4施設が増加傾向であった。撮影では8施設が減少傾向を示し、5施設が増加傾向であった。線量較差は大きく、線量最適化の再考が必要と考えられた。

  169. A Rotatable Quality Control Phantom for Evaluating the Performance of Flat Panel Detectors in Imaging Moving Objects. Peer-reviewed

    Haga Y, Chida K, Inaba Y, Kaga Y, Meguro T, Zuguchi M

    Journal of digital imaging 29 (1) 38-42 2016/02

    DOI: 10.1007/s10278-015-9816-2  

    ISSN: 0897-1889

    eISSN: 1618-727X

  170. Need for radiation safety education for interventional cardiology staff, especially nurses

    Yoshiaki Morishima, Koichi Chida, Yoshiaki Katahira, Hatsue Seto, Hiroo Chiba, Koichi Tabayashi

    Acta Cardiologica 71 (2) 151-155 2016

    Publisher: Acta Cardiologica

    DOI: 10.2143/AC.71.2.3141844  

    ISSN: 0373-7934 0001-5385

  171. Effective radiation doses of CT examinations in Japan: a nationwide questionnaire-based study. International-journal Peer-reviewed

    Yuta Matsunaga, Ai Kawaguchi, Kenichi Kobayashi, Masanao Kobayashi, Yasuki Asada, Kazuyuki Minami, Shoichi Suzuki, Koichi Chida

    The British journal of radiology 89 (1058) 20150671-20150671 2016

    DOI: 10.1259/bjr.20150671  

    ISSN: 0007-1285

    eISSN: 1748-880X

  172. Multicenter Study on Evaluation of the Entrance Skin Dose by a Direct Measurement Method in Cardiac Interventional Procedures

    Kato Mamoru, Chida Koichi, Moritake Takashi, Koguchi Yasuhiro, Kaga Yuji, Sakamoto Hajime, Tsukamoto Atsuko, Kawauchi Satoru, Matsumoto Kazuma, Matsumura Mitsuaki, Oosaka Hajime, Toyoshima Hideto

    Jpn. J. Radiol. Technol. 72 (1) 73-81 2016

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.2016_JSRT_72.1.73  

    ISSN: 0369-4305

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    Deterministic effects have been reported in cardiac interventional procedures. To prevent radiation skin injuries in percutaneous coronary intervention (PCI), it is necessary to measure accurate patient entrance skin dose (ESD) and maximum skin absorbed dose (MSD). We measured the MSD on 62 patients in four facilities by using the Chest-RADIREC system. The correlation between MSD and fluoroscopic time, dose area product (DAP), and cumulative air kerma (AK) showed good results, with the correlation between MSD and AK being the strongest. The regression lines using MSD as an outcome value (y) and AK as predictor variables (x) was y=1.18x (R2=0.787). From the linear regression equation, MSD is estimated to be about 1.18 times that of AK in real time. The Japan diagnostic reference levels (DRLs) 2015 for IVR was established by the use of dose rates using acrylic plates (20- cm thick) at the interventional reference point. Preliminary reference levels proposed by International Atomic Energy Agency (IAEA) were provided using DAP. In this study, AK showed good correlation most of all. Hence we think that Japanese DRLs for IVR should reconsider by clinical patients exposure dose such as AK.

  173. Development of Computer code for Dose Management Using DICOM Radiation Dose Structured Report in X-ray Computed Tomography Peer-reviewed

    DENDO Yutaka, SHIMURA Hirotaka, SAKAMOTO Hiroshi, SATO Kazuhiro, YANAGAWA Isao, CHIDA Koichi

    Medical Imaging and Information Sciences 33 (2) 43-47 2016

    Publisher: 医用画像情報学会

    DOI: 10.11318/mii.33.43  

    ISSN: 0910-1543

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    June 7, 2015, Japan Network for Research and Information on Medical Exposures(J-RIME)published Diagnostic Reference Levels(DRLs 2015)for the first time in Japan. To operate the DRL, it is necessary to collect a great deal of radiation dose information of own facilities efficiently. The purpose of this study was to construct a system for collecting dose information in CT examination using Radiation Dose Structured Report(RDSR). As a result of displaying the contents of RDSR using the free software, it was confirmed that there are differences in the information in RDSR by equipment and manufacturers. In-house software of dose management could be designed by focusing on the enumerated value, it was possible to extract information of interest from RDSR. For facilities which cannot introduce a commercial system, development of software for collecting radiation dose information using RDSR contributes greatly to the operation of DRL.

  174. Effect of tube current modulation for dose estimation using a simulation tool on body CT examination. International-journal Peer-reviewed

    Ai Kawaguchi, Yuta Matsunaga, Masanao Kobayashi, Shoichi Suzuki, Kosuke Matsubara, Koichi Chida

    Radiation protection dosimetry 167 (4) 562-8 2015/12

    DOI: 10.1093/rpd/ncu340  

    ISSN: 0144-8420

    eISSN: 1742-3406

  175. Novel Dosimeter Using a Nontoxic Phosphor for Real-Time Monitoring of Patient Radiation Dose in Interventional Radiology Peer-reviewed

    Masaaki Nakamura, Koichi Chida, Masayuki Zuguchi

    AMERICAN JOURNAL OF ROENTGENOLOGY 205 (2) W202-W206 2015/08

    DOI: 10.2214/AJR.14.13925  

    ISSN: 0361-803X

    eISSN: 1546-3141

  176. 冠動脈インターベンションにおける新型リアルタイム術者線量計システムの有用性 Peer-reviewed

    稲葉 洋平, 千田 浩一, 小林 亮太

    心臓 47 (6) 679-686 2015/06

    Publisher: (公財)日本心臓財団

    ISSN: 0586-4488

  177. Radiation dose of cardiac IVR x-ray systems: a comparison of present and past. Peer-reviewed

    Inaba Y, Chida K, Kobayashi R, Haga Y, Zuguchi M

    Acta cardiologica 70 (3) 299-306 2015/06

    DOI: 10.2143/AC.70.3.3080634  

    ISSN: 0001-5385

    eISSN: 0373-7934

  178. Construction of System for Support of Multifacility IVR Dose Analysis and Research Peer-reviewed

    Sun,Lue, Hitomi,Go, Futatsuya,Koichiro, Kato,Mamoru, Kawauchi,Satoru, Morota,Koichi, Tsukamoto,Atsuko, Hayakawa,Mikito, Sakae,Takeji, Matsumaru,Yuji, Chida,Koichi, Moritake,Takashi

    Jpn. J. Radiol. Technol. 71 (12) 1241-1247 2015

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.2015_JSRT_71.12.1241  

    ISSN: 0369-4305

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    Although measurement and management of angiographic entrance skin dose (ESD) are deemed extremely important, accurate determination of maximum ESD and its location is generally difficult because of the dependence on therapeutic technique and position. Following our development of body-mounted gear bearing radiophotoluminescence glass dosimeter (RPLD) arrays for direct measurement of ESD in cranial and cardiovascular angiography and interventional radiology (IVR), our focus next turned to the limited number of facilities equipped to read RPLD outputs and the need for methods to effectively provide feedback to clinical facilities. As described here, we first constructed an RPLD reading facility capable of sending and receiving RPLDs by post, offering the potential to enable utilization of the developed gear at all hospitals in Japan that perform angiography and IVR. We next developed specialized web-based system to generate dose maps from RPLD dose data, thereby enabling any facility to perform trial system analysis, evaluation, and implementation; and investigated the results and related problems.

  179. X線出力測定器による診断用X線装置の線量測定に関する基礎検討 Peer-reviewed

    小林 亮太, 千田 浩一, 稲葉 洋平, 芳賀 喜裕, 加賀 勇治, 洞口 正之

    東北大学医学部保健学科紀要 24 (1) 39-44 2015/01

    Publisher: 東北大学医学部保健学科

    ISSN: 1348-8899

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    2014年にRaySafe社から発売された非接続型X線測定器RaySafe x2の基本特性について、比較対照にRTI社製の非接続型X線測定器Piranhaを用いて実験的に検討した。結果、評価項目のうち「後方散乱」「エネルギー依存性」「線量依存性」「線量率依存性」については両測定器間で大差なく、「角度依存性」はRaySafe x2のほうが良好であった。RaySafe x2は使用前のセットアップの簡易性や解析の利便性にも優れていることから、X線装置のQCQA(Quality Control,Quality Assurance)に有用と考えられた。

  180. Clinical Factors Relating to Cervical Body Volume Reduction during Curative External Beam Radiation Therapy for Head and Neck Cancer Peer-reviewed

    Takeda K, Dobashi S, Komori S, Chida K, Kadoya N, Kida S, Ito K, Sugawara T, Kubozono M, Umezawa R, Ishikawa Y, Yamamoto T, Kozumi M, Takahashi N, Katagiri Y, Onozato Y, Kanai T, Sato K, Kishi K, Matsushita H, Ogawa T, Katori Y, Jingu K

    J Nucl Med Radiat Ther (6) 203 2014/12

  181. FUNDAMENTAL STUDY ON THE CHARACTERISTICS OF A RADIOPHOTOLUMINESCENCE GLASS DOSEMETER WITH NO ENERGY COMPENSATION FILTER FOR MEASURING PATIENT ENTRANCE DOSES IN CARDIAC INTERVENTIONAL PROCEDURES Peer-reviewed

    Mamoru Kato, Koichi Chida, Takashi Moritake, Yasuhiro Koguchi, Tadaya Sato, Hajime Oosaka, Tetsuo Tosa, Ken Kadowaki

    RADIATION PROTECTION DOSIMETRY 162 (3) 224-229 2014/12

    DOI: 10.1093/rpd/nct300  

    ISSN: 0144-8420

    eISSN: 1742-3406

  182. Direct measurement of a patient's entrance skin dose during pediatric cardiac catheterization

    Sun Lue, Mizuno Yusuke, Iwamoto Mari, Goto Takahisa, Koguchi Yasuhiro, Miyamoto Yuka, Tsuboi Koji, Chida Koichi, Moritake Takashi

    Journal of radiation research 55 (6) 1122-1130 2014/11

    Publisher: Oxford University Press

    DOI: 10.1093/jrr/rru050  

    ISSN: 0449-3060

  183. Red emission phosphor for real-time skin dosimeter for fluoroscopy and interventional radiology Peer-reviewed

    Masaaki Nakamura, Koichi Chida, Masayuki Zuguchi

    MEDICAL PHYSICS 41 (10) 2014/10

    DOI: 10.1118/1.4893534  

    ISSN: 0094-2405

  184. 多施設におけるIVR基準点線量縦断調査 Peer-reviewed

    稲葉 洋平, 千田 浩一, 小林 亮太

    臨床放射線 59 (10) 1387-1392 2014/10

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    心血管Interventional Radiology(IVR)を年間100例以上行っている宮城県仙台市内の7施設を対象に、IVR基準点におけるアクリルファントム入射表面線量測定を行い、同施設の前回調査結果(2007年)と比較した。今回調査(2014年)の透視線量率は3.9〜37.4mGy/minで平均24.2mGy/min、前回調査では9.3〜71.8mGy/minで平均27.5mGy/minであり、平均値で約12%の減少を示したが、有意差はなかった。今回の撮影線量は9.1〜82.0mGy/10secで平均44.4mGy/10sec、前回は14.7〜107.0mGy/10secで平均50.0mGy/10secであり、有意差はなかったが約13%減少した。施設ごとにみると、透視線量率、撮影線量とも大部分が減少傾向であったが、増加した施設もみられた。装置については、X線検出器がImage IntensifierからほぼFlat Panel Detectorに置き換わっていた。

  185. ディジタルX線撮影におけるPeak Signal to Noise Ratioを用いた線量指標決定法の提案

    田頭 豊, 平栗 彩加, 佐藤 和宏, 斎 政博, 梁川 功, 千田 浩一

    日本放射線技術学会雑誌 70 (9) 1059-1059 2014/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  186. Fundamental study of a real-time occupational dosimetry system for interventional radiology staff. International-journal Peer-reviewed

    Inaba Y, Chida K, Kobayashi R, Kaga Y, Zuguchi M

    Journal of radiological protection : official journal of the Society for Radiological Protection 34 (3) N65-71 2014/09

    DOI: 10.1088/0952-4746/34/3/N65  

    ISSN: 0952-4746

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    Real-time monitoring of the radiation doses received by interventional radiology (IR) staff has become highly desirable. However, occupational doses are rarely measured in real time, due to the lack of a feasible method for use in IR. Recently, the i2 system by RaySafe™ has been introduced to measure occupational exposure in IR in real time. The i2 system consists of several personal dosimeters (PDs) and a base station with a display and computer interfacing. We evaluated the fundamental performance (dose linearity, dose-rate dependence, angular dependence, batch uniformity and reproducibility) of the i2 system. The dose linearity of the i2 was excellent (R(2) = 1.00) The i2 exhibited slight dose-rate dependence (~20%) at very high dose rates (250 mGy h(-1)). Little angular dependence (within 20%) was observed between 0° and ±45°, in either the vertical or horizontal direction. We also found that the PD was highly sensitive (about 200%) at angles behind it, e.g. 180°. However, this backscattered radiation is not a problem, in general, due to the placement of the i2 sensor (PD) on the lead apron. We conclude that the i2 system facilitates accurate real-time monitoring and management of occupational doses during IR.

  187. Clinical Factors With Respect to Cervical Body Volume Reduction During Definitive External Beam Radiation Therapy for hypopharyngeal Squamous Cell Carcinoma Peer-reviewed

    Takeda K, Dobashi S, Komori S, Chida K, Kadoya N, Itoh K, Sugawara T, Kubozono M, U mezawa R, Ishikawa Y, Yamamoto T, Fujimoto T, Kozumi M, Onozato Y, Suzuki T, Matsushita H, Jingu K

    Int J Radiat Oncol Biol Phys 90 (1) 532-533 2014/09

  188. Clinical Factors With Respect to Cervical Body Volume Reduction During Definitive External Beam Radiation Therapy for Oropharyngeal Squamous Cell Carcinoma Peer-reviewed

    Takeda K, Dobashi S, Komori S, Chida K, Kadoya N, Itoh K, Sugawara T, Kubozono M, U mezawa R, Ishikawa Y, Yamamoto T, Fujimoto T, Kozumi M, Onozato Y, Suzuki T, Matsushita H, Jingu K

    Int J Radiat Oncol Biol Phys 90 (1) 511-511 2014/09

  189. [Study on the development of a patient dosimetry gown for interventional cardiology procedures].

    Mamoru Kato, Koichi Chida, Takashi Moritake, Yasuhiro Koguchi, Yuji Kaga, Hajime Sakamoto, Atsuko Tsukamoto, Satoru Kawauchi, Kazuma Matsumoto, Mitsuaki Matsumura, Hajime Oosaka, Tetsuo Tosa

    Nihon Hoshasen Gijutsu Gakkai zasshi 70 (8) 814-20 2014/08

    ISSN: 0369-4305

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    In recent years, dose justification and optimization have been attempted in percutaneous coronary intervention (PCI); however, deterministic effects have been reported. To prevent radiation skin injuries in PCI, it is necessary to measure the patient entrance skin dose (ESD), but an accurate dose measurement method has not yet been established. In this study, we developed a dosimetry gown that can measure the ESD during PCI using multiple radiophotoluminescence dosimeters (RPLDs). The RPLDs were placed into 84 pockets that were sewn into a dosimetry gown. Patients wear the original dosimetry gown during the procedures, after which we obtain accurate ESD measurements. We believe that this method using RPLDs and a newly-designed dosimetry gown provides accurate ESD measurements during PCI. We expect this system to become a standard method for measuring ESD during PCI.

  190. 災害被ばく時における電話被ばく相談の基礎的検討 Peer-reviewed

    八島幸子, 千田浩一

    日本放射線技術学会雑誌 70 (3) 242-249 2014/03/20

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.2014_JSRT_70.3.242  

    ISSN: 0369-4305

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    The Fukushima nuclear disaster occurred on March 11, 2011. For about six weeks, I worked as a counselor for phone consultations regarding radiation risk. I analyzed the number of consultations, consultations by telephone, and their changing patterns with elapse of time, to assist with consultations about risk in the future. There were a large number of questions regarding the effects of radiation, particularly with regard to children. We believe that counseling and risk communication are the key to effectively informing the public about radiation risks.

  191. Operational quantity and protection quantity

    Chida Koichi

    Journal of a Measurement Subcommittee 22 (2) 18-19 2014

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.18973/measurementjsrt.22.2_18  

  192. 看護学生の放射線に関する意識調査からみた放射線教育の重要性

    森島 貴顕, 繁泉 和彦, 千葉 浩生, 瀬戸 初江, 藤村 重文, 千田 浩一

    日本放射線安全管理学会誌 13 (2) 173-176 2014

    Publisher: Japanese Society of Radiation Safety Management

    DOI: 10.11269/jjrsm.13.173  

    ISSN: 1347-1503

  193. 補助人工心臓の制御下における循環状態モニタリング用ソフトウェアの開発 Peer-reviewed

    小林亮太, 田中明, 針生健太郎, 洞口正之, 千田浩一

    映像情報メディカル 45 (12) 988-994 2013/11/15

    Publisher:

    ISSN: 1346-1354

  194. 視覚評価チャート付きファントムを用いたオーバーチューブタイプX線TV装置の始業点検データ変動要因分析 Peer-reviewed

    太田丞二, 黒木克寿, 窪田哲也, 小浦基明, 桝田喜正, 千田浩一

    映像情報Medical 45 (4) 334-339 2013/04/20

    Publisher:

    ISSN: 1346-1354

  195. 放射線降下物によりComputed Radiography (CR)画像に写し出された黒点の基礎的検討 Peer-reviewed

    樫村康弘, 折笠秀樹, 草野義直, 今野広一, 千田浩一

    臨床放射線 58 (3) 484-489 2013/03/10

    Publisher:

    ISSN: 0009-9252

  196. 血管撮影装置におけるQC、QAデータの変動要因分析と低減方法の検討

    古山 良延, 太田 丞二, 加藤 英幸, 梅北 英夫, 川上 裕也, 千田 浩一, 桝田 喜正

    日本放射線技術学会総会学術大会予稿集 69回 206-206 2013/02

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  197. Occupational Dose in Interventional Radiology Procedures Peer-reviewed

    Koichi Chida, Yuji Kaga, Yoshihiro Haga, Nozomi Kataoka, Eriko Kumasaka, Taiichiro Meguro, Masayuki Zuguchi

    AMERICAN JOURNAL OF ROENTGENOLOGY 200 (1) 138-141 2013/01

    DOI: 10.2214/AJR.11.8455  

    ISSN: 0361-803X

  198. QUALITY CONTROL PHANTOM FOR FLAT PANEL DETECTOR X-RAY SYSTEMS Peer-reviewed

    Koichi Chida, Yuji Kaga, Yoshihiro Haga, Ken Takeda, Masayuki Zuguchi

    HEALTH PHYSICS 104 (1) 97-101 2013/01

    DOI: 10.1097/HP.0b013e3182659c72  

    ISSN: 0017-9078

    eISSN: 1538-5159

  199. The necessity of follow-up for radiation skin injuries in patients after percutaneous coronary interventions: radiation skin injuries will often be overlooked clinically Peer-reviewed

    Mamoru Kato, Koichi Chida, Tadaya Sato, Hajime Oosaka, Tetsuo Tosa, Masahito Munehisa, Ken Kadowaki

    ACTA RADIOLOGICA 53 (9) 1040-1044 2012/11

    DOI: 10.1258/ar.2012.120192  

    ISSN: 0284-1851

  200. 看護師の放射線に対する知識の現状および放射線教育の重要性―500床規模の医療機関に勤務する看護師を対象としたアンケート調査― Peer-reviewed

    森島貴顕, 繁泉和彦, 瀬戸初江, 片平美明, 千田浩一, 千葉浩生

    日本放射線技術学会雑誌 68 (10) 1373-1378 2012/10/20

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.2012_JSRT_68.10.1373  

    ISSN: 0369-4305

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    Radiation safety education/training is essential and is associated with a reduction in the radiation dose to both patients and staff. We used a questionnaire to assess the level of radiation safety knowledge among nurses working at Tohoku Kosei-Nenkin Hospital. Some nurses were also interviewed. The results of our study indicate that the nurses had insufficient radiation safety knowledge and that a high percentage of nurses were concerned about the health hazards of radiation. Moreover, more than 80% of the nurses expressed an interest in attending periodic radiation safety seminars. Appropriate radiation safety training is required to reduce nurse radiation doses, and an understanding of radiation safety can help to optimize the patient dose.

  201. Treatment outcome of high-dose image-guided intensity-modulated radiotherapy using intra-prostate fiducial markers for localized prostate cancer at a single institute in Japan Peer-reviewed

    Ken Takeda, Yoshihiro Takai, Kakutaro Narazaki, Masatoshi Mitsuya, Rei Umezawa, Noriyuki Kadoya, Yukio Fujita, Toshiyuki Sugawara, Masaki Kubozono, Eiji Shimizu, Keiko Abe, Yuko Shirata, Yohjiro Ishikawa, Takaya Yamamoto, Maiko Kozumi, Suguru Dobashi, Haruo Matsushita, Koichi Chida, Shigeto Ishidoya, Yoichi Arai, Keiichi Jingu, Shogo Yamada

    RADIATION ONCOLOGY 7 (1) 105 2012/07

    DOI: 10.1186/1748-717X-7-105  

    ISSN: 1748-717X

  202. Erratum: Precise mapping system of entrance skin dose during endovascular embolization for cerebral aneurysm (Radiation Measurements (2011) 46 (2103-2106)) Peer-reviewed

    Takashi Moritake, Mikito Hayakawa, Yuji Matsumaru, Tomoji Takigawa, Yasuhiro Koguchi, Yuka Miyamoto, Yusuke Mizuno, Koichi Chida, Keiichi Akahane, Koji Tsuboi, Takeji Sakae, Hidehiko Sakurai

    Radiation Measurements 47 (6) 465 2012/06

    DOI: 10.1016/j.radmeas.2012.05.009  

    ISSN: 1350-4487

  203. 冠動脈インターベンションの進化とデバイスの進化 Peer-reviewed

    加藤 守, 千田 浩一, 土佐 鉄雄

    映像情報メディカル 44 (6) 610-613 2012/05/20

  204. Physician-received scatter radiation with angiography systems used for interventional radiology: comparison among many X-ray systems Peer-reviewed

    Koichi Chida, Yoshiaki Morishima, Youhei Inaba, Masaaki Taura, Ayako Ebata, Ken Takeda, Hirotaka Shimura, Masayuki Zuguchi

    RADIATION PROTECTION DOSIMETRY 149 (4) 410-416 2012/05

    DOI: 10.1093/rpd/ncr312  

    ISSN: 0144-8420

  205. Precise mapping system of entrance skin dose during endovascular embolization for cerebral aneurysm Peer-reviewed

    Takashi Moritake, Mikito Hayakawa, Yuji Matsumaru, Tomoji Takigawa, Yasuhiro Koguchi, Yuka Miyamoto, Yusuke Mizuno, Koichi Chida, Keiichi Akahane, Koji Tsuboi, Takeji Sakae, Hidehiko Sakurai

    RADIATION MEASUREMENTS 46 (12) 2103-2106 2011/12

    DOI: 10.1016/j.radmeas.2011.08.008  

    ISSN: 1350-4487

  206. Clarifying and Visualizing Sources of Staff-Received Scattered Radiation in Interventional Procedures Peer-reviewed

    Koichi Chida, Takeshi Takahashi, Daisuke Ito, Hirotaka Shimura, Ken Takeda, Masayuki Zuguchi

    AMERICAN JOURNAL OF ROENTGENOLOGY 197 (5) W900-W903 2011/11

    DOI: 10.2214/AJR.10.6396  

    ISSN: 0361-803X

  207. Flat-panel Detector搭載型血管撮影装置における視野サイズを考慮した患者被ばく線量低減法 Peer-reviewed

    加藤守, 千田浩一, 吉田恭平, 佐々木文昭, 佐々木正文, 大阪肇, 土佐鉄雄

    日本放射線技術学会雑誌 67 (11) 1443-1447 2011/11

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.67.1443  

    ISSN: 0369-4305

    More details Close

    Angiographic equipment has tended toward using flat-panel detector (FPD). However, the radiation dose varies depending on the size of field of view (FOV) in the FPD. Although we were using 7 inch FOV in cardiac procedures, we examined a way to reduce the patients' radiation dose by using 8 inch FOV utilizing a digital zoom processing. We measured the absorbed dose rates at an interventional reference point (IRP) with 20 cm acrylic board to compare 8 inch FOV using a digital zoom processing with 7 inch FOV. Additionally we visually evaluated these phantom images. Result of comparison of absorbed dose rates at IRP, 8 inch FOV using a digital zoom processing was reduced more than 7 inch FOV (fluoroscopic 29.0% and digital cine 37.5%). These phantom images were of equivalent quality. The method to use 8 inch FOV utilizing a digital zoom processing technique in cardiac procedures is one of the effective radiation exposure reduction methods.

  208. 頭頸部IMRTの精度管理に関する基礎的検討 Peer-reviewed

    倉元達矢, 武田賢, 千田浩一, 山田章吾, 高井良尋

    臨床放射線 56 (8) 1009-1015 2011/08

    Publisher:

    ISSN: 0009-9252

  209. Comparison of dose at an interventional reference point between the displayed estimated value and measured value Peer-reviewed

    Koichi Chida, Yohei Inaba, Yoshiaki Morishima, Masaaki Taura, Ayako Ebata, Isao Yanagawa, Ken Takeda, Masayuki Zuguchi

    Radiological Physics and Technology 4 (2) 189-193 2011/07

    DOI: 10.1007/s12194-011-0121-6  

    ISSN: 1865-0333 1865-0341

  210. 新型リアルタイム患者皮膚被曝線量計の性能評価 Peer-reviewed

    森島貴顕, 千田浩一, 片平美明, 小野寺理紗, 武田賢, 千葉浩生

    臨床放射線 56 (6) 779-785 2011/06

    Publisher:

    ISSN: 0009-9252

  211. [Reduction method of patients' radiation dose considering the size of field of view with a digital cine X-ray system loading a flat-panel detector]. Peer-reviewed

    Kato Mamoru, Chida Koichi, Yoshida Kyouhei, Sasaki Fumiaki, Sasaki Masafumi, Oosaka Hajime, Tosa Tetsuo

    Nihon Hoshasen Gijutsu Gakkai Zasshi 67 (11) 1443-1447 2011/04

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.67.1443  

    ISSN: 0369-4305

    More details Close

    Angiographic equipment has tended toward using flat-panel detector (FPD). However, the radiation dose varies depending on the size of field of view (FOV) in the FPD. Although we were using 7 inch FOV in cardiac procedures, we examined a way to reduce the patients' radiation dose by using 8 inch FOV utilizing a digital zoom processing. We measured the absorbed dose rates at an interventional reference point (IRP) with 20 cm acrylic board to compare 8 inch FOV using a digital zoom processing with 7 inch FOV. Additionally we visually evaluated these phantom images. Result of comparison of absorbed dose rates at IRP, 8 inch FOV using a digital zoom processing was reduced more than 7 inch FOV (fluoroscopic 29.0% and digital cine 37.5%). These phantom images were of equivalent quality. The method to use 8 inch FOV utilizing a digital zoom processing technique in cardiac procedures is one of the effective radiation exposure reduction methods.

  212. COMPARISON OF THE RADIATION DOSE IN A CARDIAC IVR X-RAY SYSTEM Peer-reviewed

    Youhei Inaba, Koichi Chida, Kazutoshi Shirotori, Hirotaka Shimura, Isao Yanagawa, Masayuki Zuguchi, Shoki Takahashi

    RADIATION PROTECTION DOSIMETRY 143 (1) 74-80 2011/01

    DOI: 10.1093/rpd/ncq287  

    ISSN: 0144-8420

  213. EVALUATING THE MAXIMUM PATIENT RADIATION DOSE IN CARDIAC INTERVENTIONAL PROCEDURES Peer-reviewed

    Mamoru Kato, Koichi Chida, Tadaya Sato, Hajime Oosaka, Tetsuo Tosa, Ken Kadowaki

    RADIATION PROTECTION DOSIMETRY 143 (1) 69-73 2011/01

    DOI: 10.1093/rpd/ncq286  

    ISSN: 0144-8420

  214. Radiation Dose to the Pediatric Cardiac Catheterization and Intervention Patient Peer-reviewed

    Koichi Chida, Tadayuki Ohno, Shuhei Kakizaki, Mika Takegawa, Hiroko Yuuki, Mitsuru Nakada, Shoki Takahashi, Masayuki Zuguchi

    AMERICAN JOURNAL OF ROENTGENOLOGY 195 (5) 1175-1179 2010/11

    DOI: 10.2214/AJR.10.4466  

    ISSN: 0361-803X

  215. 経皮的冠動脈インターベンションにおける患者被曝に関して Peer-reviewed

    加藤守, 吉田恭平, 佐々木文昭, 佐々木正文, 大阪肇, 土佐鉄雄, 佐藤匡也, 宗久雅人, 寺田健, 阿部芳久, 門脇謙, 千田浩一

    心臓 42 (10) 1285-1293 2010/10

    Publisher: Japan Heart Foundation

    DOI: 10.11281/shinzo.42.1285  

    ISSN: 0586-4488

  216. [Patient skin injury in cardiac intervention procedures]. Invited

    Kato Mamoru, Chida K, Sato T, Kadowaki K, Tosa T, Oosaka H, Sasaki M, Sasaki F, Yoshida K

    Nippon Hoshasen Gijutsu Gakkai Zasshi 66 (6) 688-689 2010/06/20

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.66.688  

    ISSN: 0369-4305

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    Purpose: To discuss the circumstances of patient skin injury in cardiac interventional radiology (IVR).<br>· To demonstrate the importance of evaluating the patient radiation dose in IVR.<br>· To show the need for the appropriate patient follow-up after IVR to identify radiation effects.<br>· To highlight the incidence of skin injuries during IVRs.<br>CONTENT ORGANIZATION:<br>· Evaluation of 400 consecutive percutaneous coronary interventions (PCIs)<br>The radiation dose, number of cine runs, and fluoroscopic time were recorded for all patients. The skin on the patients' backs was reviewed periodically after PCI to identify radiation injury. The relationships between patient skin effects and factors such as the radiation dose were investigated.<br>· Reviewing previous reports of patient radiation injury<br>Occurrence rate, fluoroscopic time, radiation dose (if available), etc.<br>SUMMARY:<br>Although increasing numbers of case reports of patient radiation injury resulting from IVR are being published, these reports likely represent a small fraction of actual cases. Radiation skin injury in IVR is overlooked clinically in many patients. Patients who receive a high radiation dose while undergoing IVR should be followed to identify radiation skin effects, and physicians should seek to establish whether a patient has had previous IVR, together with the entrance site and radiation dose.

  217. The combination of S-1 and Oxaliplatin enhance the antitumor activity in vivo and in vitro in a human ovarian cancer model Peer-reviewed

    地元佑輔, 仲田栄子, 駒村一樹, 長澤陽介, 渡邊重明, 齋藤春夫, 森一生, 田村元, 町田好男, 石橋忠司, 千田浩一, 志田原美保, 小山内実, 小倉隆英, 細貝良行, 川住祐介, 土橋卓, 高井良尋

    Bulletin of School of Health Sciences, Tohoku University 19 (2) 107-115 2010

    Publisher:

    ISSN: 1348-8899

  218. Is the MOSFET dosimeter feasible at diagnostic X-ray energies for interventional radiology?

    K. Chida, Y. Inaba, I. Yanagawa, H. Saito, T. Ishibashi, M. Zuguchi

    IFMBE Proceedings 25 1-2 2009/12/01

    DOI: 10.1007/978-3-642-03902-7-1  

    ISSN: 1680-0737

  219. Radiation Dose of Interventional Radiology System Using a Flat-Panel Detector Peer-reviewed

    Koichi Chida, Yohei Inaba, Haruo Saito, Tadashi Ishibashi, Shoki Takahashi, Masahiro Kohzuki, Masayuki Zuguchi

    AMERICAN JOURNAL OF ROENTGENOLOGY 193 (6) 1680-1685 2009/12

    DOI: 10.2214/AJR.09.2747  

    ISSN: 0361-803X

  220. Radiation dose of the X-ray equipment used for cardiac IVR: A preliminary study. Peer-reviewed

    Inaba Y, Chida K

    Saito Ho-on Kai Museum Nat Hist Research Bulletin. 73 23-27 2009/04

  221. Evaluation of an Adaptive Filter for CT under Low-CNR Condition : Comparison with Linear Filter Peer-reviewed

    MORI Issei, UCHIDA Miho, SATO Ami, SATO Shingo, TAMURA Hajime, TAKAI Yoshihiro, ISHIBASHI Tadashi, SAITO Haruo, HOSOKAI Yoshiyuki, OGURA Takahide, CHIDA Koichi, MACHIDA Yoshio

    Japanese Journal of Radiological Technology 65 (1) 15-24 2009/01/20

    Publisher: Japanese Society of Radiological Technology (JSRT)

    DOI: 10.6009/jjrt.65.15  

    ISSN: 0369-4305

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    The use of an adaptive filter for CT images is becoming a common procedure and is said to reduce image noise while preserving sharpness and helping to reduce the required X-ray dose. Although many reports support this view, the validity of such evaluations is arguable. When the linearity of a system is in question, physical performance indexes should be measured under conditions similar to those of clinical use. Evaluations of diagnosis using clinical images may be fallible because the non-filtered image used as the reference might not have been optimally reconstructed. We have chosen simple, but commonly used, adaptive filters for our evaluation. As a reference for comparing performance, we designed linear filters that best approximate the noise characteristics of the adaptive filters. MTF is measured through observation of the edge-spread function. Clinical abdominal images are used to compare the performance of adaptive filters and linear filters. We conclude that the performance of the type of adaptive filter we have chosen is virtually the same as that of the linear filter, as long as the image quality of soft tissues is our interest. Both the noise SD and MTF are virtually the same if the contrast of the object is not substantially higher than 150 HU. Images of soft tissues obtained with the use of adaptive filters are also virtually the same as those obtained by linear filters. The edge-preservation characteristic of this adaptive filter is not observable for soft tissues.

  222. Reduced compression mammography to reduce breast pain Peer-reviewed

    Koichi Chida, Yuka Komatsu, Masahiro Sai, Asuka Nakagami, Takayuki Yamada, Takuya Yamashita, Issei Mori, Tadashi Ishibashi, Shin Maruoka, Masayuki Zuguchi

    CLINICAL IMAGING 33 (1) 7-10 2009/01

    DOI: 10.1016/j.clinimag.2008.06.025  

    ISSN: 0899-7071

  223. Evaluating the performance of a MOSFET dosimeter at diagnostic X-ray energies for interventional radiology Peer-reviewed

    Koichi Chida, Youhei Inaba, Hanako Masuyama, Isao Yanagawa, Issei Mori, Haruo Saito, Shin Maruoka, Masayuki Zuguchi

    Radiological Physics and Technology 2 (1) 58-61 2009/01

    DOI: 10.1007/s12194-008-0044-z  

    ISSN: 1865-0333

  224. Basic study on selection of the standard materials for diffusion coefficient measurement Peer-reviewed

    佐々木洋介ほか

    Bulletin of School of Health Sciences, Tohoku University 18 (1) 37-44 2009

    Publisher:

    ISSN: 1348-8899

  225. Comparison of scattered radiation in a cardiac IVR X-ray system Peer-reviewed

    稲葉洋平 ほか

    Bulletin of School of Health Sciences, Tohoku University 18 (1) 45-51 2009

    Publisher:

    ISSN: 1348-8899

  226. Effect of Radiation Monitoring Method and Formula Differences on Estimated Physician Dose during Percutaneous Coronary Intervention Peer-reviewed

    K. Chida, Y. Morishima, H. Masuyama, H. Chiba, Y. Katahira, Y. Inaba, I. Mori, S. Maruoka, S. Takahashi, M. Kohzuki, M. Zuguchi

    ACTA RADIOLOGICA 50 (2) 170-173 2009

    DOI: 10.1080/02841850802616745  

    ISSN: 0284-1851

  227. Evaluation of Patient Radiation Dose during Cardiac Interventional Procedures: What Is the Most Effective Method? Peer-reviewed

    K. Chida, Y. Kagaya, H. Saito, T. Ishibashi, S. Takahashi, M. Zuguchi

    ACTA RADIOLOGICA 50 (5) 474-481 2009

    DOI: 10.1080/02841850902852752  

    ISSN: 0284-1851

  228. A phantom study of comparison of cardiac SPECT analysis: really, is the Polar map view right? Peer-reviewed

    高根侑美, 佐藤彩, 藤原怜子, 三品昌仁, 小田桐逸人, 南部武幸, 児玉裕康, 阿部養悦, 梁川功, 石橋忠司, 高井良尋, 齋藤春夫, 森一生, 田村元, 町田好男, 千田浩一, 小山内実, 佐藤行彦, 川住祐介, 小倉隆英, 仲田栄子, 丸岡伸, 細貝良行

    Bulletin of School of Health Sciences, Tohoku University 18 (2) 83-92 2009

    Publisher:

    ISSN: 1348-8899

  229. Feasibility of cardiac MR examination during quantitative isometric muscular exercise Peer-reviewed

    Koichi Chida, Tatuo Nagasaka, Masahiro Kohzuki, Haruo Saito, Issei Mori, Shin Maruoka, Shoki Takahashi, Shogo Yamada, Masayuki Zuguchi

    ACTA CARDIOLOGICA 63 (5) 547-552 2008/10

    DOI: 10.2143/AC.63.5.2033219  

    ISSN: 0001-5385

  230. Usefulness of non-lead aprons in radiation protection for physicians performing interventional procedures Peer-reviewed

    Masayuki Zuguchi, Koichi Chida, Masaaki Taura, Yohei Inaba, Ayako Ebata, Shogo Yamada

    RADIATION PROTECTION DOSIMETRY 131 (4) 531-534 2008/09

    DOI: 10.1093/rpd/ncn244  

    ISSN: 0144-8420

  231. 血管撮影装置のI.I.変換係数用いた管理について. Peer-reviewed

    加藤 守 ほか

    映像情報MEDICAL. 40 (10) 943-947 2008/09

    Publisher:

    ISSN: 1346-1354

  232. Examination of the long-term stability of radiation survey meters and electronic pocket dosemeters Peer-reviewed

    Koichi Chida, Yuko Nishimura, Yuko Sato, Ayumi Endo, Mutsumi Sakamoto, Chiharu Hoshi, Masayuki Zuguchi

    RADIATION PROTECTION DOSIMETRY 129 (4) 431-434 2008/05

    DOI: 10.1093/rpd/ncm476  

    ISSN: 0144-8420

  233. X線診断領域におけるDirect Ion Storage線量計の性能評価 Peer-reviewed

    小島康弘, 佐藤静, 佐藤咲耶, 千田浩一

    東北大学医学部保健学科紀要 17 (1) 71-79 2008/01

    Publisher:

    ISSN: 1348-8899

  234. Quantification of radial organization in a dysplastic cerebral cortex with diffusion tensor imaging Peer-reviewed

    Masahiro MURASAKI, Tatsuo NAGASAKA, Shin MARUOKA, Yoshihiro TAKAI, Yukihiko SATO, Yoshiyuki HOSOKAI, Takahide OGURA, Issei MORI, Tadashi ISHIBASHI, Koichi CHIDA, Eiko NAKATA, Yoshio MACHIDA, Noriyasu HOMMA, Haruo SAITO, Hajime TAMURA

    Bulletin of School of Health Sciences, Tohoku University 17 (2) 127-134 2008

    Publisher:

    ISSN: 1348-8899

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    Radial organization of dysplastic cerebral cortices was hypothesized and magnetic resonance diffusion tensor imaging was performed for an infant who had a dysplasia in the right cerebral cortex. Absolute value of the inner product of the normal vector to the cerebral surface and the first eigen vector (that depicts the direction of the largest eigen value of diffusion tensor) was calculated for each pixel. The absolute value of the inner product was significantly larger for the dysplastic side than for the contralateral normal side of the brain.

  235. Long term survival of thyroid carcinoma with bone metastasis: treated with 21 courses of iodine-131 administration Peer-reviewed

    Toru SAKAYAUCHI, Shin MARUOKA, Yoshiyuki HOSOKAI, Koichi CHIDA, Mamoru NAKAMURA, Shogo YAMADA

    Bulletin of School of Health Sciences, Tohoku University 17 (2) 101-106 2008

    Publisher:

    ISSN: 1348-8899

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    21 courses of Iodine-131 (I-131) therapy were given over a period of 30 years to a patient with follicular thyroid carcinoma and metastatic sacral bone tumor. The cumulative quantity of I-131 reached 86.17GBq. This series of I-131 treatment achieved good control of the sacral bone metastasis. Although the cumulative radioactivity dose of I-131 was high, the patient had no symptomatic pulmonary fibrosis, myelosuppression, or leukemia. The patient eventually developed bladder carcinoma, and died of this disease. Although a causal link between I-131 therapy and bladder carcinoma could not be confirmed, exposure to I-131 radiation may have been the cause of the urinary tract carcinoma. In cases treated with a total dose of I-131 exceeding the usual maximum dosage of 37GBq, the risks of secondary cancer should be considered.

  236. Total entrance skin dose: An effective indicator of maximum radiation dose to the skin during percutaneous coronary intervention Peer-reviewed

    Koichi Chida, Yutaka Kagaya, Haruo Saito, Yoshihiro Takai, Shoki Takahashi, Shogo Yamada, Masahiro Kohzuki, Masayuki Zuguchi

    AMERICAN JOURNAL OF ROENTGENOLOGY 189 (4) W224-W227 2007/10

    DOI: 10.2214/AJR.07.2422  

    ISSN: 0361-803X

  237. Patient skin dose in cardiac interventional procedures: Conventional fluoroscopy versus pulsed fluoroscopy Peer-reviewed

    Koichi Chida, Kenji Fuda, Haruo Saito, Yoshihiro Takai, Shoki Takahashi, Shogo Yamada, Masahiro Kohzuki, Masayuki Zuguchi

    CATHETERIZATION AND CARDIOVASCULAR INTERVENTIONS 69 (1) 115-121 2007/01

    DOI: 10.1002/ccd.20961  

    ISSN: 1522-1946

  238. Influence of the target vessel on the location and area of maximum skin dose during percutaneous coronary intervention Peer-reviewed

    K. Chida, K. Fuda, Y. Kagaya, H. Saito, Y. Takai, M. Kohzuki, S. Takahashi, S. Yamada, M. Zuguchi

    ACTA RADIOLOGICA 48 (8) 846-850 2007

    DOI: 10.1080/02841850701468875  

    ISSN: 0284-1851

  239. Indicators of the maximum radiation dose to the skin during percutaneous coronary intervention in different target vessels Peer-reviewed

    Koichi Chida, Haruo Saito, Yutaka Kagaya, Masahiro Kohzuki, Yoshihiro Takai, Shoki Takahashi, Shogo Yamada, Masayuki Zuguchi

    CATHETERIZATION AND CARDIOVASCULAR INTERVENTIONS 68 (2) 236-241 2006/08

    DOI: 10.1002/ccd.20830  

    ISSN: 1522-1946

  240. Relationship between fluoroscopic time, dose-area product, body weight, and maximum radiation skin dose in cardiac interventional procedures Invited Peer-reviewed

    K Chida, H Saito, H Otani, M Kohzuki, S Takahashi, S Yamada, K Shirato, M Zuguchi

    AMERICAN JOURNAL OF ROENTGENOLOGY 186 (3) 774-778 2006/03

    DOI: 10.2214/AJR.04.1653  

    ISSN: 0361-803X

  241. 院内PHSが電子ポケット線量計に及ぼす影響 Peer-reviewed

    Effects of electromagnetic fields emitted, from cellular telephones for in-hospital use on electronic pocket dosimeters

    Bull. Sch. Health Sci. Tohoku Univ. 15 (1) 29-34 2006/01

    Publisher:

    ISSN: 1348-8899

  242. MRI検査室用運動負荷試験装置の試作 Peer-reviewed

    永坂竜男, 山中一臣, 伊藤大輔, 志村浩孝, 梁川功, 千田浩一

    日本放射線技術学会東北部会雑誌 (15) 86-87 2006/01

  243. The relationship between plasma BNP level and the myocardial phosphocreatine/adenosine triphosphate ratio determined by phosphorus-31 magnetic resonance spectroscopy in patients with dilated cardiomyopathy Peer-reviewed

    Koichi Chida, Hiroki Otani, Masahiro Kohzuki, Haruo Saito, Yutaka Kagaya, Yoshihiro Takai, Shoki Takahashi, Shogo Yamada, Masayuki Zuguchi

    CARDIOLOGY 106 (3) 132-136 2006

    DOI: 10.1159/000092767  

    ISSN: 0008-6312

  244. Evaluation of additional lead shielding in protecting the physician from radiation during cardiac interventional procedures. Invited Peer-reviewed

    Chida Koichi, Morishima Yoshiaki, Katahira Yoshiaki, Chiba Hiroo, Zuguchi Masayuki

    Nippon Hoshasen Gijutsu Gakkai Zasshi 61 (12) 1632-1637 2005/12/20

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00004022974  

    ISSN: 0369-4305

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    Since cardiac interventional procedures deliver high doses of radiation to the physician, radiation protection for the physician in cardiac catheterization laboratories is very important. One of the most important means of protecting the physician from scatter radiation is to use additional lead shielding devices, such as tableside lead drapes and ceiling-mounted lead acrylic protection. During cardiac interventional procedures(cardiac IVR), however, it is not clear how much lead shielding reduces the physician dose. This study compared the physician dose [effective dose equivalent(EDE)and dose equivalent(DE)]with and without additional shielding during cardiac IVR. Fluoroscopy scatter radiation was measured using a human phantom, with an ionization chamber survey meter, with and without additional shielding. With the additional shielding, fluoroscopy scatter radiation measured with the human phantom was reduced by up to 98%, as compared with that without. The mean EDE(whole body, mean±SD)dose to the operator, determined using a Luxel badge, was 2.55±1.65 and 4.65±1.21 mSv/year with and without the additional shielding, respectively(p=0.086). Similarly, the mean DE(1ens of the eye)to the operator was 15.0±9.3 and 25.73±5.28 mSv/year, respectively(p=0.092). In conclusion, although tableside drapes and lead acrylic shields suspended from the ceiling provided extra protection to the physician during cardiac IVR, the reduction in the estimated physician dose(EDE and DE)during cardiac catheterization with additional shielding was lower than we expected. Therefore, there is a need to develop more ergonomically useful protection devices for cardiac IVR.

  245. FFT analysis of the X-ray tube voltage waveforms of high-frequency generators for radiographic systems Invited Peer-reviewed

    K Chida, H Saito, D Ito, H Shimura, M Zuguchi, Y Takai

    ACTA RADIOLOGICA 46 (8) 810-814 2005/12

    DOI: 10.1080/02841850500335069  

    ISSN: 0284-1851

  246. Optimization of tube potential-filter combinations for film-screen mammography - A contrast detail phantom study Peer-reviewed

    K Chida, M Zuguchi, M Sai, H Saito, T Yamada, T Ishibashi, D Ito, N Kimoto, M Kohzuki, S Takahashi

    CLINICAL IMAGING 29 (4) 246-250 2005/07

    DOI: 10.1016/j.clinimag.2004.11.003  

    ISSN: 0899-7071

  247. Feasibility of rapid-sequence P-31 magnetic resonance spectroscopy in cardiac patients Invited Peer-reviewed

    K Chida, H Otani, H Saito, T Nagasaka, Y Kagaya, M Kohzuki, M Zuguchi, K Shirato

    ACTA RADIOLOGICA 46 (4) 386-390 2005/07

    DOI: 10.1080/02841850510021283  

    ISSN: 0284-1851

  248. I. IおよびX線管焦点-被写体間距離, およびFIDの違いによる患者皮膚入射線量低減効果の違い(放射線管理 IVR・被ばく解析, 一般研究発表予稿集, 日本放射線技術学会第33回秋季学術大会)

    小野寺 理紗, 高野 正彦, 千田 浩一, 森嶋 貴顕, 千葉 浩生, 佐藤 咲子

    日本放射線技術学会雑誌 61 (9) 1241-1242 2005

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00004028266  

  249. Measure of Convertion factor in Image Intensifier: Comparison between two method Peer-reviewed

    森島貴顕, 千田浩一, 片股明彦, 佐々木昌浩, 千葉浩生, 洞口正之

    Bull. Sch. Health Sci. Tohoku Univ. 14 (1) 33-39 2005/01

    Publisher:

    ISSN: 1348-8899

  250. Computer-aided diagnosis for detection of cardiomegaly in digital chest radiographs Peer-reviewed

    T Ishida, S Katsuragawa, K Chida, H MacMahon, K Doi

    Medical Imaging 2005: Image Processing, Pt 1-3 5747 914-920 2005

    DOI: 10.1117/12.595755  

    ISSN: 0277-786X

  251. Does digital acquisition reduce patients' skin dose in cardiac interventional procedures? An experimental study Peer-reviewed

    K Chida, H Saito, M Zuguchi, K Shirotori, S Kumagai, H Nakayama, K Matsubara, M Kohzuki

    AMERICAN JOURNAL OF ROENTGENOLOGY 183 (4) 1111-1114 2004/10

    ISSN: 0361-803X

  252. Bull. Sch. Health Sci. Tohoku Univ. Peer-reviewed

    小野寺理紗, 小川育子, 多田茂, 富樫亜紀, 千田浩一, 立花茂, 中田充, 本間経康

    東北大学医学部保健学科紀要 13 (2) 93-100 2004/08

  253. Fundamental study on radiation exposure in pulsed fluoroscopy: Comparison of low pulse rate fluoroscopy with that of high pulse rate Peer-reviewed

    布田憲司, 千田浩一, 中原直人, 長川正良, 大石幹雄, 洞口正之

    Bull. Sch. Health Sci. Tohoku Univ. 13 (2) 85-91 2004/08

  254. Rapid-sequence phosphorus-31 magnetic resonance spectroscopy of the human heart using a 1.5-T clinical system Peer-reviewed

    K Chida, H Saito, T Nagasaka, H Otani, M Kohzuki, M Zuguchi

    ACTA RADIOLOGICA 45 (1) 30-37 2004/02

    DOI: 10.1080/02841850410003284  

    ISSN: 0284-1851

  255. 82 パルス透視の被曝線量に関する実験的検討(放射線管理 計測-1)(一般研究発表)(第32回秋季学術大会)

    布田 憲司, 中原 直人, 長川 正良, 千田 浩一

    日本放射線技術学会雑誌 60 (9) 1210-1210 2004

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003174335  

  256. The effectiveness of additional lead shielding in protecting the operator from radiation during cardiac catheterization Peer-reviewed

    森島貴顕, 千田浩一, 佐々木昌浩, 繁泉和彦, 千葉浩生, 佐藤行彦, 洞口正之

    Bull. Sch. Health Sci. Tohoku Univ. 13 (1) 11-21 2004/01

    Publisher:

    ISSN: 1348-8899

  257. Evaluation of bone strength using clinical MR imager Peer-reviewed

    南部武幸, 安部真治, 中谷儀一郎, 千田浩一

    Bull. Sch. Health Sci. Tohoku Univ. 12 (2) 131-141 2003/08

  258. CAREグラフによるIVR被曝測定 Peer-reviewed

    千田浩一, 佐藤州彦

    日本放射線技術学会計測分科会誌, 11 (1). 31-37. 11 (1) 31-37 2003/04

    Publisher:

    DOI: 10.18973/measurementjsrt.11.1_31  

  259. 305 心筋^<31>P-MRSの臨床応用に向けた基礎的検討 第2報(MR臨床 心臓)

    永坂 竜男, 山中 一臣, 松崎 智子, 渡邊 浩幸, 中村 大介, 梁川 功, 佐々木 正寿, 千田 浩一

    日本放射線技術学会雑誌 59 (9) 1096-1096 2003

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00000922175  

  260. Stability of electron-beam energy monitor for quality assurance of the electron-beam energy from radiotherapy accelerators Peer-reviewed

    K Chida, H Saito, Y Takai, M Zuguchi, M Mitsuya, H Sakakida, M Kohzuki, S Yamada

    TOHOKU JOURNAL OF EXPERIMENTAL MEDICINE 198 (3) 197-201 2002/11

    DOI: 10.1620/tjem.198.197  

    ISSN: 0040-8727

    eISSN: 1349-3329

  261. Ventriculography using ECG-gated multiple diastolic injection of contrast material in pediatric angiocardiography Peer-reviewed

    K Chida, T Tanaka, H Saito, M Zuguchi, A Ozawa, S Watanabe, K Sato, M Kohzuki

    PEDIATRIC CARDIOLOGY 23 (2) 200-204 2002/03

    DOI: 10.1007/s00246-001-0047-6  

    ISSN: 0172-0643

  262. Safety and clinical benefits of transsubxiphoidal left ventricular puncture Peer-reviewed

    M Zuguchi, C Shindoh, K Chida, H Saito, Y Takai, S Yamada, A Iguchi, M Endo, H Akimoto, K Tabayashi

    CATHETERIZATION AND CARDIOVASCULAR INTERVENTIONS 55 (1) 58-65 2002/01

    DOI: 10.1002/ccd.10073  

    ISSN: 1522-1946

  263. Comparison of pulsed fluoroscopy by direct control using a grid-controlled X-ray tube Peer-reviewed

    千田浩一, ほか

    Japanese journal of radiological technology 57 (12) 1534-1539 2001/12

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001357710  

    ISSN: 0369-4305

    More details Close

    Interventional radiology(IVR)procedures may involve high radiation doses that are potentially harmful to the patient. In IVR procedures. pulsed fluoroscopy can greatly decrease the radiation that the physician and patient receive. There are two types of pulsed fluoroscopy : direct control and primary(indirect)control. The purpose of this study was to compare pulsed fluoroscopy by direct control, using a grid-controlled x-ray tube, with pulsed fluoroscopy using primary control. For both types of pulsed fluoroscopy, we measured the waveforms(x-ray tube voltage, x-ray tube current, and x-ray output)and the relative radiation dose. In addition, we compared the decrease in radiation during pulsed fluoroscopy using a care filter. The studies were performed using a Siemens Bicor Plus x-ray System(direct control)and a Siemens Multistar Plus x-ray System(primary control). Using primary pulse control, a 50% decrease in the x-ray output waveform took approximately 0.5-1.0 msec, or longer with a lower x-ray tube current. Using direct pulse control, a 50% decrease in the x-ray output waveform took approximately 0.1 msec, and was independent of x-ray tube current. The rate of radiation reduction with primary pulse control using the care filter with a lower x-ray tube current had a slope exceeding 10%. Pulsed fluoroscopy by direct control using a grid-controlled x-ray tube permits an optimal radiation dose. To decrease the radiation in primary pulse control, a care filter must be used, particularly with a lower x-ray tube current.

  264. Relationship between pulmonary capillary wedge pressure tracing V waves and left atrial excursion obtained by M-mode echocardiography Peer-reviewed

    千田浩一, ほか

    Medical Imaging and Information Sciences 17 (3) 147-151 2000/09

    Publisher: Medical Imaging and Information Sciences

    DOI: 10.11318/mii1984.17.147  

    ISSN: 0910-1543

    More details Close

    Usually, large V waves in a pulmonary capillary wedge pressure tracing are most often due to mitral valve regurgitation. However, the V wave is often increased in patients without mitral regurgitation. Several investigators have reported that a large V wave is dependent on left atrial compliance. Thus, we investigated the V wave pressure obtained by right heart catheterization and the size of left atrial excursion. (LAE) obtained by M-mode echocardiography using parasternal long-axis view. LAE used in this study were determined as follows: "LAE"=("left atrial diameter at T of ECG"-"left atrial diameter at R of ECG" )/"maximum left atrial diameter". The subjects comprised 60 patients with various forms of heart diseases. Correlation was reasonable between the V wave pressure and the size of LAE (r=-0.52, p<0.001). This study provides additional information regarding relationship between large V waves and mitral regurgitation.

  265. Relationship between the pixel value in digital subtraction angiography and iodine concentration: Study in high iodine concentration with original phantom Peer-reviewed

    K Chida, M Sai, H Saito, K Takase, M Zuguchi, M Sasaki, T Sato

    TOHOKU JOURNAL OF EXPERIMENTAL MEDICINE 190 (3) 169-176 2000/03

    DOI: 10.1620/tjem.190.169  

    ISSN: 0040-8727

    eISSN: 1349-3329

  266. Operator radiation dose estimation in cardiac catheterization by transbrachial approach-Comparison with transfemoral approach Peer-reviewed

    千田浩一, ほか

    HEART 31 (8) 585-592 1999/08

    Publisher: Japan Heart Foundation

    DOI: 10.11281/shinzo1969.31.8_585  

    ISSN: 0586-4488

  267. Usefulness of DSA in left Ventriculography and analysis of cardiac function Peer-reviewed

    千田浩一, ほか

    Image Technology & Information Display 24 (4) 223-229 1999/02

  268. 187 患者被曝管理システムCAREGRAPHの使用経験

    佐藤 州彦, 臼井 章仁, 千田 浩一, 渡辺 暁, 大沼 京子, 三井 伸也, 佐々木 正寿

    日本放射線技術学会雑誌 55 (9) 896-896 1999

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003110795  

  269. 195 DSA装置による血管径計測精度の比較検討

    大沼 京子, 佐藤 州彦, 臼井 章仁, 千田 浩一, 渡辺 暁, 三井 伸也, 佐々木 正寿

    日本放射線技術学会雑誌 55 (9) 898-898 1999

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003110803  

  270. Evaluation of non-invasive X-ray analyzer (type 9001) Peer-reviewed

    渡辺暁, 千田浩一, ほか

    Bulletin of College of Medical Sciences Tohoku University 7 (2) 115-122 1998/12

  271. Evaluation of polygraph for cardiac catheterization Peer-reviewed

    Koichi Chida

    Japanese Journal of Radiological Technology 54 (4) 512-516 1998/04

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001351984  

    ISSN: 0369-4305

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    We present our system for polygraph quality control, i.e., gain adjustment and zero correction of the amplifiers and recorders of two polygraphs that are used for monitoring blood pressure and ECG in cardiac catheterization. We examined the zero drift and frequency characteristics of the equipment, for which the gain and zero level of the amplifiers and recorders showed unstable drifting for several hours after the power supply was turned on. We devised plugs for adjusting the amplifiers and recorders. These simple devices made it easy to adjust gain and zero level, and therefore improved the quality control of the equipment in everyday practice.

  272. Measurement of scattering X-ray spectra in angiocardiography Peer-reviewed

    石屋博樹, 千田浩一, ほか

    Japanease Journal of Circulatory Technology 10 20-22 1998/04

  273. Evaluation of X-ray analyzer for mammography Peer-reviewed

    佐藤弘之, ほか

    Japanese Journal of Radiological Technology 54 (3) 385-391 1998/03

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001351944  

    ISSN: 0369-4305

    More details Close

    It is very important that x-ray tube voltage be accurately measured and evaluated in mammography. However, this is time-consuming work. Therefore, we used non-invasive x-ray analyzers (MODEL 100, KYOKKO; NERO 6000M, VICTREEN; NOMEX, PTW). These analyzers make the measurement of x-ray tube voltage extremely easy. They result in few errors in the measurement of x-ray tube voltage, but have an effect on the environment. The measurement of exposure time corresponded closely with actual values. These analyzers have good stability and reliability. Therefore, these non-invasive x-ray analyzers are suitable for use in the quality control of mammographic equipment.

  274. Evaluation of fluorescence meter(EY-1002D)in high-frequency generators

    Sakamoto Hiroshi, Chida Kouichi, Satoh Hiroyuki, Ogawa Yoko, Sasaki Masatoshi, Katakura Tsuyoshi

    Japanese Journal of Radiological Technology 54 (1) 180-180 1998

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001351850  

    ISSN: 0369-4305

  275. Development and Evaluation of a Fluorescence Meter Using a Photodiode : 2nd Report

    Japanese Journal of Radiological Technology 54 (9) 1121-1121 1998

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001352268  

  276. Evaluation of Image Quality and Radiation Exposure on Degeneration of II

    Japanese Journal of Radiological Technology 54 (9) 1132-1132 1998

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001352301  

  277. 肺静脈還流異常症の術後評価に於けるMRI診断の有用性について Peer-reviewed

    洞口正之, ほか

    東北大学医療技術短期大学部紀要 6 29-33 1997/07

  278. 付加フィルターがX線アナライザ測定値に及ぼす影響 Peer-reviewed

    砂金芳朋, 千田浩一, ほか

    東北大学医療技術短期大学部紀要 6 67-73 1997/07

  279. Accuracy of a monitoring unit for x-ray tube voltage and current in X-ray high-voltage generator Peer-reviewed

    千田浩一, ほか

    Japanese journal of radiological technology 53 (2) 265-271 1997/02

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003109745  

    ISSN: 0369-4305

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    X-ray high-voltage generations have racently been developed. One type incorporating a monitoring unit for X-ray tube voltage and X-ray tube current, has been particularly popular. The output of the monitoring unit is said to be almost proportional to the X-ray tube voltage and current of the X-ray high-voltage generator. The output of the monitoring unit is obtained mainly by a built-in resistance bleeder. We compared the accuracy of the monitoring unit with conventional direct measuring using an invasive tube voltage and current meter(AB-2015D-MII, TOREX). For X-ray tube voltage, almost the same results were obtained with the monitoring unit and the conventional direct measuring method. But the results with inverter-type X-ray generators differed somewhat from those obtained by conventional direct measuring. The X-ray tube current signal measured by the monitoring unit has different overshoot and waveform from that obtained by the conventional direct measuring method. In the steady state, however, the data were almost in agreement. We conclude that the monitoring unit should be applicable to the quality control of X-ray high-voltage generators.

  280. Evaluation of Fluorescence Meter (EY-1002D) in High-Frequency X-tay Generators

    Japanese Journal of Radiological Technology 53 (9) 1459-1459 1997

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001356522  

  281. 295 Change of fluorography by deterioration of brightness of CRT and illuminance of environment

    Sato Kunihiko, Chida Kouichi, Ishiya Hiroki, Watanabe Satoru, Nagasaka Tatsuo, Sai Masahiro, Sasaki Masatoshi, Shimizu Tomohiro

    Japanese Journal of Radiological Technology 53 (8) 1167-1167 1997

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001356138  

    ISSN: 0369-4305

  282. Performance Comparision of Non-invasive X-ray Analyzers(11th report)

    WATANABE S., CHIDA K., ISHIYA H., SATOU H., NAKADA M., SATOU K., SASAKI M.

    Japanese Journal of Radiological Technology 53 (7) 871-871 1997

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001355887  

    ISSN: 0369-4305

  283. Introduction(Workshop : Im pursuit of batter Scan Techniquis"Diagnostic imaging in Cardiac Diseases")

    CHIDA KOICHI

    Japanese Journal of Radiological Technology 53 (6) 714-716 1997

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001355784  

    ISSN: 0369-4305

  284. Non-invasive型X線アナライザの性能評価―透視条件における検討― Peer-reviewed

    石屋博樹, 千田浩一 ほか

    東北大学医療技術短期大学部紀要 5 77-82 1996/08

  285. Digital subtraction angiographyにおける被験者の被曝線量低減に関する臨床的検討 Peer-reviewed

    永坂竜男, 千田浩一 ほか

    臨床放射線 41 (2) 243-249 1996/02

  286. Measurement of spectrum of scattered radiation in cardiac catheterization

    Japanese Journal of Radiological Technology 52 (8) 932-932 1996

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001354652  

  287. Quality control of POLYGRAPH for Cardiac Catheterization

    Nagasaka Tatsuo, Chida Kouichi, Ishiya Hiroki, Satoh Kunihiko, Sasaki Masatoshi, Zuguchi Masayuki

    Japanese Journal of Radiological Technology 52 (2) 240-240 1996

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001354162  

    ISSN: 0369-4305

  288. Evaluation of tube voltage waveforms by the frequency analysis method-In inverter type X-ray high-voltage generator Peer-reviewed

    Chida K

    Japanese Journal of Radiological Technology 13 (2) 269-277 1995/12

  289. X線管電圧・管電流計AB-2015D-M11の性能評価 Peer-reviewed

    佐藤弘之, 千田浩一 ほか

    東北大学医療技術短期大学部紀要 4 (2) 105-110 1995/08

  290. Usefulness of digital subtraction angiography for left ventriculography using transsubxiphoidal approach Peer-reviewed

    千田浩一 ほか

    Bulletin of College of Medical Sciences Tohoku University 4 (2) 125-132 1995/08

  291. X線アナライザによるX線量測定−X線装置管理を目的とした検討- Peer-reviewed

    斎 政博, 千田浩一 ほか

    日本放射線技術学会雑誌 51 (7) 827-832 1995/07

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001352459  

    ISSN: 0369-4305

    More details Close

    By using an X-ray analyzer, it is possible to evaluate the performance of an X-ray apparatus, such as tube voltage, exposure time and irradiation dose. In this study, a comparison of irradiation dose was made using two X-ray analyzers(NERO 6000B and Model 100)and the conventional direct readout dosimeter(ionization chamber). The irradiation dose determined by Nero almost agreed with that by the conventional direct readout dosimeter for the 2-peak, 12-peak, constant potential and inverter-type X-ray generators. The irradiation dose determined by Model 100 dose not necessarily agreed with that by the conventional direct readout dosimeter at a lower tube voltage. The error is attributed to the detection theory(direct or indirect)of X-ray analyzers. The stability and reproducibility results by X-ray analyzers were excellent. Moreover, X-ray analyzers were safe and easy to handle. Therefore, they can be used for controlling the quality of X-ray generators, though we have to be careful about a characteristics of X-ray analyzers.

  292. Performance of X-ray analyzer(NOMEX) Peer-reviewed

    千田浩一, ほか

    Japanese Journal of Clinical Radiology 40 (6) 753-756 1995/06

  293. 東北大学病院の心臓カテーテル検査における被曝線量の実態と対策 Peer-reviewed

    永坂竜男, 千田浩一 ほか

    臨床放射線 40 (3) 345-349 1995/03

  294. Performace of AB-2015D-MII(Tube voltage and current meter)

    SATOH HIROYUKI, OGURA TAKAHIDE, CHIDA KOUICHI, YANAGAWA ISAO, SAWAI YOSHIKAZU, SASAKI MASATOSHI

    Japanese Journal of Radiological Technology 51 (3) 264-264 1995

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001353482  

    ISSN: 0369-4305

  295. Quality control of POLYGRAPH for Cardiac Catheterization(Program of 23rd Autumn Meeting)

    Japanese Journal of Radiological Technology 51 (9) 1257-1257 1995

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001352932  

  296. 375 Accuracy of monitoring unit of tube voltage and current in X-ray high voltage generator

    Chida K, Nagasaka T, Sai M, Satoh H, Shimizu T, Honma A, Sasaki M

    Japanese Journal of Radiological Technology 51 (10) 1445-1445 1995

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001353146  

    ISSN: 0369-4305

  297. 373 Performance Comparison of Non-invasive X-ray Analyzers(10th report)

    SATOH H, CHIDA K, ISHIYA H, YANAGAWA I, SAWAI Y, SASAKI M, SAKAMOTO K, SATOH M

    Japanese Journal of Radiological Technology 51 (10) 1443-1443 1995

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001353144  

    ISSN: 0369-4305

  298. 463 Comparizon of DSA value and density of iodine

    Sai Masahiro, Chida Kouichi, Satoh Kunihiko, Sasaki Muneki, Sugano Noriko, Sasaki Masatoshi

    Japanese Journal of Radiological Technology 51 (10) 1532-1532 1995

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00001353233  

    ISSN: 0369-4305

  299. 10.新しい管電圧・管電流計AB-2015D-M II(TOREX)の使用経験(東北部会)

    佐藤 弘之, 澤井 義一, 千田 浩一, 佐々木 正寿, 小倉 隆英, 渡辺 暁, 梁川 功

    日本放射線技術学会雑誌 51 (6) 760-760 1995

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003109299  

  300. インバータ式X線装置の管電圧波形の周波数解析 Peer-reviewed

    千田浩一 ほか

    日本放射線技術学会雑誌 50 (11) 1847-1861 1994/11

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003325680  

    More details Close

    The tube voltage waveform in an inverter type X-ray high-voltage generator has a very high frequency as compared to single-phase, three-phase and constant potential generators. Tube voltage waveforms in an inverter type X-ray high-voltage generator vary according to tube loading and apparatus. It is very significant that X-ray tube voltage and waveforms should be accurately measured and evaluated. For tube voltage waveforms, the ripple and peak number have been used. However, for high frequency waveforms of tube voltage such as those of the inverter type X-ray high-voltage generator, the ripple and peak number are insufficient for a more detailed estimation. Then, we suggest the frequency analysis method as a newer and more detailed one. In this method, waveforms are analyzed using the fast Fourier transform (FFT). In this paper, the tube voltage waveforms in the inverter type X-ray high-voltage generator will be estimated in detail. The method is convenient to the assessment of distortion and frequency of tube voltage waveforms, especially useful for a detailed evaluation of the inverter type X-ray high-voltage generator. In other words, this method makes possible an objective comparison and careful examination of tube voltage waveforms in the inverter type X-ray high-voltage generator. Therefore, this method is useful for better quality control (QC) of the inverter type X-ray high-voltage generator.

  301. Usefulness of konica imager (Li-10A) Peer-reviewed

    千田浩一, ほか

    Konica x-ray joarnal 220 (45) 65-69 1994/09

  302. シース断端血管内異物への同軸的ガイドワイヤー挿入法が有効であった経皮的異物除去の1症例 Peer-reviewed

    洞口正之, 千田浩一 ほか

    心血管インターベンション 9 (6) 711-715 1994/06

  303. 東北大学病院の心臓カテーテル検査における被曝線量の実態-新旧2台の装置の比較- Peer-reviewed

    千田浩一, ほか

    全国シネ撮影研究会誌 6 75-77 1994/04

  304. 122. Present Condition of Radiation Dose and Btterment for Cardiac Catheterization in TOHOKU University Hospital

    Nagasaka Tatsuo, Chida Kouichi, Sai Masahiro, Sugano Noriko, Arima Hiroyasu

    Japanese Journal of Radiological Technology 50 (2) 241-241 1994

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003534604  

  305. 110. Performance Comparison of Non-invasive X-ray Analyzers (8th Report)

    Isago Y., Chida K., Sai M., Ishiya H., Satoh H., Arima H.

    Japanese Journal of Radiological Technology 50 (2) 229-229 1994

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003534592  

  306. 46. Dual Venography for TIPS under the Bi-plane DSA

    Sato K., Ishiya H., Ogura T., Sai M., Chida K., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 50 (2) 165-165 1994

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003534528  

  307. 1. CR7000 システムを用いた IVP における機能的評価法の試み(撮影, 東北部会)

    永坂 竜男, 千田 浩一, 菅野 典子, 佐々木 正寿, 有馬 宏寧

    日本放射線技術学会雑誌 50 (6) 792-792 1994

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003325743  

  308. 5. インバータ式 X 線装置 (インバータ周波数 30kHz) の管電圧波形の測定(装置管理, 東北部会)

    佐藤 弘之, 佐々木 信行, 千田 浩一, 斎 政博, 清水 智大, 本間 明徳, 佐々木 正寿, 有馬 宏寧

    日本放射線技術学会雑誌 50 (6) 792-792 1994

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003325748  

  309. 50. Performance of AB-2015D-M II (Tube voltage and current meter)

    Japanese Journal of Radiological Technology 50 (10) 1769-1769 1994

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003325546  

  310. 374. Stady for Lower Irradiation of Patient Dose in IA-DSA (3rd report)

    Nagasaka Tatsuo, Chida Kouichi, Sai Masahiro, Ishiya Hiroki, Isago Yoshitomo, Satoh Kunihiko, Arima Hiroyasu, Zuguchi Masayuki

    Japanese Journal of Radiological Technology 50 (8) 1289-1289 1994

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003326173  

  311. 428. Frequency Analysis of Tube Voltage Waveform (5th report)

    Chida K., Sai M., Hamao N., Satoh K., Honma A., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 50 (8) 1343-1343 1994

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003326227  

  312. 429. Performance Comparison of Non-invasive X-ray Analyzers (9th report)

    SATOH HIROYUKI, OGURA TAKAHIDE, CHIDA KOUICHI, SUGANO NORIKO, SHIMIZU TOMOHIRO, SASAKI MASATOSHI, ARIMA HIROYASU, SATOH MASAMI, SATOH MAMORU

    Japanese Journal of Radiological Technology 50 (8) 1344-1344 1994

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003326228  

  313. Usefulness of digital Subtraction angiography for the evaluation of left ventricular function in bicycle exercise Peer-reviewed

    千田浩一, ほか

    Bulletin of College of Medical Sciences Tohoku University 3 (1) 29-36 1994/01

  314. Study for lower irradiation of patient dose in digital subtraction angiography Peer-reviewed

    千田浩一, ほか

    Japanese Journal of Medical Physics 14 (1) 9-14 1994/01

    Publisher:

    DOI: 10.11323/jjmp1992.14.1_9  

    ISSN: 0918-8010

  315. Computed Radiographyによるサブトラクション報を用いたDrip Infusion Chorangiography Peer-reviewed

    斎 政博, 千田浩一 ほか

    映像情報MEDICAL 25 1517-1521 1993/12

  316. Evaluation of tube voltage waveforms by frequency analysis method in single-phase, three-phase and constant potential generator Peer-reviewed

    千田浩一, ほか

    Japanese journal of radiological technology 49 (10) 1732-1738 1993/10

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003577112  

    More details Close

    It is very important that X-ray tube voltage and waveforms are accurately measured and evaluated. For estimation of the tube voltage waveforms, the tube voltage ripple and tube voltage peak number have been used. However, these are insufficient for more detailed estimation of the tube voltage wave forms. We suggest a frequency analysis method as a newer and more detailed one. In this method, waveforms are analyzed by using fast Fourier transform (FFT). In this paper, tube voltage waveforms in single-phase, three-phase, and constant potential generators will be estimated in detail. In single-phase and three-phase generators, our method is useful for the assessment of distortion of tube voltage waveforms. In a constant potential generator, it is convenient to carry out detailed evaluation of overshoot of tube voltage waveforms. In other words, this method makes possible an objective comparison and a careful examination of tube voltage waveforms in single-phase, three-phase and constant potential generators.

  317. FCR7000を用いた乳房のエネルギーサブトラクション Peer-reviewed

    佐々木正寿, ほか

    映像情報MEDICAL 25 758-761 1993/08

  318. 223. Performance Evaluation of X-ray Equipment Caribrator

    Japanese Journal of Radiological Technology 49 (3) 487-487 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003577458  

  319. 225. Performance Comparison of Non-invasive X-ray Analyzers (Part 7)

    Japanese Journal of Radiological Technology 49 (3) 488-488 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003577460  

  320. 440. Study for lower patient irradiation dose at IA-DSA (Part 2)

    Japanese Journal of Radiological Technology 49 (3) 531-531 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003577676  

  321. 478. Frequency Analysis of Tube Voltage Waveform. (Part 3)

    Japanese Journal of Radiological Technology 49 (3) 538-538 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003577715  

  322. 95. Frequency Analysis of Tube Voltage Waveform. (4 th report)

    Japanese Journal of Radiological Technology 49 (9) 1657-1657 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003325312  

  323. 46. Dual Venography for TIPS under the Bi-plane DSA

    Japanese Journal of Radiological Technology 49 (9) 1647-1647 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003325263  

  324. 122. Exposure investigation of cardiac catheterization in TOHOKU UNIVERSITY HOSPITAL

    Japanese Journal of Radiological Technology 49 (9) 1662-1662 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003325339  

  325. 110. Performance Comparison of Non-invasive X-ray Analizers (8 th report)

    Japanese Journal of Radiological Technology 49 (9) 1660-1660 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003325327  

  326. 42. Fundamental Stady for Low Exposure Dose of DSA

    Nagasaka Tatsuo, Chida Kouichi, Sai Masahiro, Itagaki Ryouji, Satoh Kunihiko, Arima Hiroyasu

    Japanese Journal of Radiological Technology 49 (2) 162-162 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003501087  

  327. 478. Frequency Analysis of Tube Voltage Waveform.(3rd report)

    Chida K., Sai M., Hamao N., Sakakida H., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 49 (8) 1499-1499 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003325062  

  328. 9. Frequency Analysis of Tube Voltage Wavefome. (Part 2)

    Chida K., Sai M., Ishiya H., Isago Y., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 49 (2) 130-130 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003501055  

  329. 8. Characteristics of Invertor Generator in Fluorography

    HAMAO N., CHIDA K., SASAKI M., SATOH K., SASAKI M., ARIMA H.

    Japanese Journal of Radiological Technology 49 (2) 129-129 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003501054  

  330. 182. Perfomance Comparison of Non-invasive X-ray Analyzers (Part 5)

    Chida K., Sai M., Hamao N., Satoh H., Sasaki M., Arima H., Takahashi N.

    Japanese Journal of Radiological Technology 49 (2) 302-302 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003501227  

  331. 181. Performance Comparison of Non-invasive X-ray analyzers (Part 4)

    Sakakida Hideharu, Chida Kouichi, Sai Masahiro, Ishiya Hiroki, Sugano Noriko, Arima Hiroyasu

    Japanese Journal of Radiological Technology 49 (2) 301-301 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003501226  

  332. 183. Perfomance Comparison of Non-invasive X-ray Analyzers (Part 6)

    Chida K., Satoh H., Sugano N., Satoh K., Sasaki M., Arima H., Takahashi N.

    Japanese Journal of Radiological Technology 49 (2) 303-303 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003501228  

  333. 440. Study for lower patient irradiation dose at IA-DSA (2nd report)

    Nagasaka Tatsuo, Chida Kouichi, Sai Masahiro, Satoh Kunihiko, Arima Hiroyasu, Zuguchi Masayuki

    Japanese Journal of Radiological Technology 49 (8) 1461-1461 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003325024  

  334. 225. Performance Comparison of Non-invasive X-ray Analyzers (7th Report)

    Ishiya H., Chida K., Sai M., Satoh H., Arima H., Sasaki M.

    Japanese Journal of Radiological Technology 49 (8) 1250-1250 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003324813  

  335. 223. Performance Evaluation of X-ray Equipment Caribrator

    Sai M., Chida K., Satoh K., Satoh H., Sugano N., Arima H., Sudoh Y.

    Japanese Journal of Radiological Technology 49 (8) 1248-1248 1993

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003324811  

  336. 東北大学におけるDSAの使用状況 過去6年間での検討 Peer-reviewed

    永坂竜男, 千田浩一 ほか

    日本放射線技師会誌 39 (10) 1371-1377 1992/10

  337. X線管電圧波形の新しい評価法の提案-周波数解析による評価の試み- Peer-reviewed

    千田浩一, ほか

    医用画像情報学会雑誌 9 (3) 119-125 1992/10

    DOI: 10.11318/mii1984.9.119  

  338. Performance comparison of four X-ray analyzers and Study on measurment of inverter type X-ray generators. Peer-reviewed

    千田浩一, ほか

    Japanese Journal of Radiological Technology 48 (4) 625-632 1992/04

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003500369  

    More details Close

    A comparison was made of four X-ray analyzers including a new type and conventional direct measuring methods. Values for voltage by X-ray analyzers agreed with those by conventional direct measuring methods for the 2 peak, 12 peak, and constant potential generators. Exposure periods determined by X-ray analyzers also agreed with those by conventional direct measuring methods over 10 msec. The stability and reproducibility results by X-ray analyzers are excellent. They are thus applicable to the quality control of X-ray generators. There are two types of the X-ray analyzers; one is for the storage of data, and the other is not. They differ in size. A more appropriate type should be used according to certain purposes and conditions. In the case of inverter type X-ray generators with the same percent ripple and frequency as constant potential generators, the data for tube voltage by X-ray analyzers agreed with those by conventional direct measuring methods. In the case of generators with larger ripple and higher frequency, the data differed from those by conventional direct measuring methods. The error is attributed to the sampling time of X-ray analyzers.

  339. 41. 当病院における CR 消化管造影の検討 : (フィルム, CR 兼用型消化管撮影装置の増感紙が CR 画像に及ぼす影響について) (画像処理, 東北部会)

    菅野 義久, 佐々木 岬, 阿部 養悦, 千田 浩一, 阿部 喜弘, 斎 政博, 小倉 隆英, 石屋 博樹, 砂金 芳朋, 有馬 宏寧, 藤城 栄

    日本放射線技術学会雑誌 48 (6) 944-945 1992

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003576747  

    More details Close

    1) 増感紙のX線吸収率と散乱線含有率を考慮した分の被曝線量の軽減が考えられる. 2) オーパーオールウィナースペクトル, 視覚評価の結果, 増感紙がCR画像に及ぼす影響は写真上ほとんど問題がないと考えられる.3) 今後, MTFや低コントラスト信号の検出能比較などさらに検討していきたい.

  340. 20. 心臓カテーテル検査用ポリグラフ装置 EP1102 の性能評価 (装置 (II), 東北部会)

    千田 浩一, 永坂 竜男, 斎 政博, 佐藤 州彦, 佐々木 正寿, 有馬 宏寧, 洞口 正之

    日本放射線技術学会雑誌 48 (6) 940-940 1992

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003576721  

  341. 19. 透視条件におけるインバータ装置の諸特性について (装置 (II), 東北部会)

    佐々木 斉喜, 千田 浩一, 石屋 博樹, 砂金 芳朋, 浜尾 典子, 佐々木 正寿, 有馬 宏寧

    日本放射線技術学会雑誌 48 (6) 940-940 1992

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003576720  

  342. 28. X 線アナライザによる X 線量測定に関する検討 (管理撮影 (II), 東北部会)

    斎 政博, 千田 浩一, 榊田 秀晴, 板垣 良二, 佐々木 正寿, 有馬 宏寧

    日本放射線技術学会雑誌 48 (6) 942-942 1992

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003576731  

  343. 42. Fundamental studies for Low Patient Dose of Digital Subtraction Angiography (DSA)

    Japanese Journal of Radiological Technology 48 (9) 1729-1729 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003576909  

  344. 120. Study of Measurement of Overall Characteristic Curve with CR System

    Japanese Journal of Radiological Technology 48 (3) 500-500 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003533650  

  345. 59. Frequency Analysis of Tube Voltage Waveform. (Part 1)

    Japanese Journal of Radiological Technology 48 (3) 488-488 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003533589  

  346. 216. Performance Comparison of Non-invasive X-ray Analizers (Part 3)

    Japanese Journal of Radiological Technology 48 (3) 519-519 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003533746  

  347. 67. Intraarterial DSA of Breast Imaging and Stady of Low Exposure Dose

    Nagasaka T., Chida K., Mitsuya M., Sai M., Satoh K., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 48 (2) 193-193 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003533253  

  348. 13. X 線アナライザによるコンデンサ式 X 線装置測定に関する検討(管理技術 (I), 東北部会)

    石屋 博樹, 佐藤 和宏, 千田 浩一, 佐藤 弘之, 斎 政博, 菅野 典子, 榊田 秀晴, 有馬 宏寧

    日本放射線技術学会雑誌 48 (12) 2140-2140 1992

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003533143  

  349. 24. Usefulness of Digital Subtraction Imaging for Assessment of Exercise Ventricular Function

    Chida K., Nagasaka T., Sai M., Satoh K., Sasaki M., Arima H., Zuguchi M.

    Japanese Journal of Radiological Technology 48 (2) 150-150 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003533210  

  350. 31. 東北大学に於ける解離性大動脈瘤に対する DSA 検査について(画像技術 (II), 東北部会)

    千田 浩一, 斎 政博, 板垣 良二, 佐藤 州彦, 佐々木 正寿, 有馬 宏寧, 洞口 正之

    日本放射線技術学会雑誌 48 (12) 2143-2143 1992

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003533165  

  351. 25. DSA の被曝線量低減に関する基礎的検討(管理技術 (II), 東北部会)

    永坂 竜男, 千田 浩一, 斎 政博, 佐藤 州彦, 板垣 良二, 有馬 宏寧

    日本放射線技術学会雑誌 48 (12) 2142-2142 1992

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003533158  

  352. 9. Frequency Analysis of Tube Voltage Waveform. (Part 2)

    Japanese Journal of Radiological Technology 48 (9) 1723-1723 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003576876  

  353. 8. Characteristics of Invertor Generator in Fluorography

    Japanese Journal of Radiological Technology 48 (9) 1722-1722 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003576875  

  354. 183. Performance Comparison of Non-invasive X-ray Analyzers (Part 6)

    Japanese Journal of Radiological Technology 48 (9) 1757-1757 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003577050  

  355. 182. Performance Comparison of Non-invasive X-ray Analyzers (Part 5)

    Japanese Journal of Radiological Technology 48 (9) 1757-1757 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003577049  

  356. 181. Performance Comparison of Non-invasive X-ray Analizers (Part 4)

    Japanese Journal of Radiological Technology 48 (9) 1757-1757 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003577048  

  357. 59. Frequency Analysis of Tube Voltage Waveform. (Part 1)

    Chida K., Sai M., Hamao N., Isago Y., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 48 (8) 1144-1144 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003500457  

  358. 216. Performance Comparizon of Non-invasive X-ray Analizers (Part 3)

    Sai M., Chida K., Sakakida H., Itagaki R., Ishiya H., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 48 (8) 1299-1299 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003500612  

  359. 120. Study of Measurement of Overall Characteristic Curve with CR System

    Sasaki Seisyo, Abe Yoshihiro, Itagaki Ryouji, Abe Youetsu, Nagasaka Tatsuo, Chida Kouichi

    Japanese Journal of Radiological Technology 48 (8) 1204-1204 1992

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003500517  

  360. CRシステムにおける短時間でのFading現象 Peer-reviewed

    千田浩一, ほか

    日本放射線技師会誌 38 (6) 689-694 1991/06

  361. 24. Usefulness of Digital Subtraction Imaging for Assessment of Exercise Ventricular Function

    Japanese Journal of Radiological Technology 47 (9) 1722-1722 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003532811  

  362. 67. IA-DSA of Breast Imaging and Study of Low Exposure Dose

    Japanese Journal of Radiological Technology 47 (9) 1732-1732 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003532854  

  363. 35. Performance Comparison of Non-inversive X-ray Analizers (Part 2)

    Chida K., Sakakida H., Sai M., Satoh M., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 47 (8) 1070-1070 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003323779  

  364. 34. Performance Comparison of Non-inversive X-ray Analizers (Part 1)

    Satoh M., Chida K., Sakakida H., Itagaki R., Sasaki M., Arima H.

    Japanese Journal of Radiological Technology 47 (8) 1069-1069 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003323778  

  365. 34. Performance Comparison of Non-inversive X-ray Analizers (Part 1)

    Japanese Journal of Radiological Technology 47 (3) 448-448 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003323119  

  366. 35. Performance Comparison of Non-inversive X-ray Analizers (Part 2)

    Japanese Journal of Radiological Technology 47 (3) 449-449 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003323120  

  367. 178. Experiment with Drip Infusion Cholangiography Subtraction by Computed Radiography

    Sai M., Chida K., Sasaki M., Numata H., Kanno Y., Abe Y., Arima H., Kitayama O.

    Japanese Journal of Radiological Technology 47 (8) 1211-1211 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003323920  

  368. 33. CR による DIC サブトラクションの試み(MR・CR, 東北部会)

    斎 政博, 千田 浩一, 佐々木 岬, 沼田 仁志, 菅野 義久, 阿部 喜弘, 有馬 宏寧, 北山 修

    日本放射線技術学会雑誌 47 (4) 681-681 1991

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003500156  

  369. 2. Non-invasive 型 X 線出力アナライザ (240 型マルチファンクションメータ) の性能評価(装置その他, 東北部会)

    榊田 秀晴, 千田 浩一, 板垣 良二, 佐々木 正寿, 有馬 宏寧, 勝又 三夫

    日本放射線技術学会雑誌 47 (4) 670-670 1991

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003500119  

  370. 178. Experiment with Drip Infusion Cholangiography Subtraction by Computed Radiography

    Japanese Journal of Radiological Technology 47 (3) 484-484 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003323263  

  371. 77. Evaluation of Cardiac Functional Analysis by Digital Sabtraction Angiography

    Chida K., Mitsuya M., Kanno Y., Nagasaka T., Satoh M., Satoh K., Sasaki M., Arima H., Zuguchi M.

    Japanese Journal of Radiological Technology 47 (2) 188-188 1991

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003322863  

  372. The fading effect in a relatively short time on imaging plate Peer-reviewed

    千田浩一, ほか

    Japanese Journal of Medical Imaging and Information Sciences 7 (2) 79-87 1990/02

    Publisher: Medical Imaging and Information Sciences

    DOI: 10.11318/mii1984.7.79  

    ISSN: 0910-1543

    More details Close

    We measured the fading effect in a relatively short time (minute order) on Imaging Plate indirectly from pixel value. We ascer lore fading effect than been recognized. So, especially when we measure the digital characteristic curve of FCR system, the fading effect cannot be ignored. Therefore we prevented a change of the digital characteristic curve from fading effect to some degree when we read images after 20 minutes from an exposure.<BR>Nevertheless, when we measure in a small latitude, the fading effect is strong and we can't get a true digital characteristic curve.<BR>But, by use of exposure with aluminum step-wedge method, we finally had a good result.

  373. 60. FCR7000 システムにおける特性曲線の測定(画像理論 (II), 東北部会)

    千田 浩一, 佐々木 斉喜, 勝又 三夫, 佐々木 正寿, 有馬 宏寧, 大石 幹雄, 片倉 剛

    日本放射線技術学会雑誌 46 (6) 873-874 1990

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003477481  

  374. 77. Evaluation of Cardiac Functional Analysis by Digital Subtraction Angiography

    Japanese Journal of Radiological Technology 46 (10) 1650-1650 1990

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.KJ00003499906  

  375. 29. CR を用いた Cobey 法について(CR, 東北部会)

    斎 政博, 佐々木 岬, 佐藤 州彦, 佐藤 誠, 千田 浩一, 永坂 竜男, 佐藤 正美, 榊田 秀晴

    日本放射線技術学会雑誌 46 (6) 864-864 1990

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003477443  

  376. 4. 乳房 DSA 検査の撮影技術的検討 : 被ばく線量低減に関して(画像処理, 東北部会)

    三津谷 正俊, 阿部 喜弘, 高橋 規之, 千田 浩一, 菅野 義久, 勝又 三夫, 石橋 忠司

    日本放射線技術学会雑誌 46 (6) 856-856 1990

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003477413  

  377. 15. シネ撮影システムの QC(撮影 (II), 東北部会)

    沼田 仁志, 梁川 功, 佐々木 清昭, 菅野 義久, 千田 浩一, 勝又 三夫, 大久 敏弘

    日本放射線技術学会雑誌 46 (6) 860-860 1990

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003477426  

  378. 22. 線量コントロール型 X 線テレビステレオ装置の開発〔第一報〕(装置 (I), 東北部会)

    佐藤 正美, 千田 浩一, 佐々木 正寿, 大石 幹雄, 片倉 剛

    日本放射線技術学会雑誌 46 (6) 862-862 1990

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003477434  

  379. 17. 胸部撮影用 X 線発生装置の性能比較(装置 (I), 東北部会)

    神田 秀晴, 千田 浩一, 斉 政博, 佐藤 正美, 永坂 竜夫, 佐藤 誠, 佐藤 州彦, 佐々木 岬, 有馬 宏寧

    日本放射線技術学会雑誌 46 (6) 861-861 1990

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003477429  

  380. 14. 大口径(40cm)I.I.を用いたDSAシステムについて : 特に歪みに関しての検討 : DSA・CR : 会員研究発表 : 東北部会

    千田 浩一, 勝又 三夫, 菅野 義久, 佐々木 斉喜, 梁川 功, 佐々木 正寿, 有馬 宏寧, 大石 幹夫, 片倉 剛

    日本放射線技術学会雑誌 45 (4) 568-568 1989

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00001359407  

  381. シネ回転撮影法の検討 : SIEMENS社製BICORシステムによるBiplne同時回転撮影法 : シネ撮影

    菅野 義久, 千田 浩一, 高橋 規之, 佐々木 清昭, 勝又 三夫, 沼田 仁志, 佐々木 斉喜, 阿部 喜弘, 佐藤 正美, 永坂 竜男, 有馬 宏寧, 大石 幹雄, 洞口 正之

    日本放射線技術学会雑誌 45 (8) 1001-1001 1989

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00001359703  

  382. シネ回転撮影法の検討 : SIEMENS社製 BICORシステムによるBiplne同時回転撮影法

    菅野 義久, 千田 浩一, 高橋 規之, 佐々木 清昭, 勝又 三夫, 沼田 仁志, 佐々木 斉喜, 阿部 善弘, 佐藤 正美, 永坂 竜男, 有馬 宏寧, 大石 幹雄, 洞口 正之

    日本放射線技術学会雑誌 45 (3) 402-402 1989

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003108567  

  383. 442.CCDカメラによるイメージインテンシファイアの管理 : 第44回総会学術大会会員研究発表予稿

    千田 浩一, 勝又 三夫, 佐々木 正寿, 有馬 宏寧, 大石 幹雄, 片倉 剛

    日本放射線技術学会雑誌 44 (3) 360-360 1988

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00001361025  

  384. CCDカメラによるイメージインテンシファイアの管理 : 第44回総会学術研究発表抄録 : I. I.

    千田 浩一, 勝又 三夫, 佐々木 正寿, 有馬 宏寧, 大石 幹夫, 片倉 剛

    日本放射線技術学会雑誌 44 (8) 1109-1109 1988

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00001361682  

  385. 39.X線TV系の特性測定のための基礎研究(その1) : 東北部会 : 管理

    千田 浩一, 佐々木 正寿, 大石 幹雄, 片倉 剛

    日本放射線技術学会雑誌 44 (5) 585-585 1988

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00003108289  

  386. 50.当院におけるウィナースペクトル測定システムにいて : 現像・管理 : 東北部会

    阿部 養悦, 千田 浩一, 三津谷 正俊

    日本放射線技術学会雑誌 43 (11) 1685-1685 1987

    Publisher: 公益社団法人 日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00001363929  

Show all ︎Show first 5

Misc. 162

  1. Initial study of a novel real-time dosimetry system using spherical small Si semiconductor devices-Evaluation with computed tomography-

    藤沢昌輝, 稲葉洋平, 稲葉洋平, 進藤僚太, 松本卓己, 松本真之介, 加田渉, 千田浩一, 千田浩一

    応用物理学会学術講演会講演予稿集(CD-ROM) 72nd 2025

    ISSN: 2436-7613

  2. Comparison of shielding effects of over-glasses-type and regular eyewear in terms of occupational eye dose reduction

    Ryota Shindo, Saya Ohno, Keisuke Yamamoto, Satoe Konta, Yohei Inaba, Masatoshi Suzuki, Masayuki Zuguchi, Koichi Chida

    Journal of Radiological Protection 44 (2) 2024/06

    DOI: 10.1088/1361-6498/ad4714  

    ISSN: 0952-4746

    eISSN: 1361-6498

  3. Measurement of lens dose of PCI operators using a real-time dosimeter~A study on the relationship between dose area product and lens dose~

    藤沢昌輝, 曽田真宏, 芳賀喜裕, 加藤聖規, 曽田真宏, 芳賀喜裕, 加藤聖規, 加賀勇治, 阿部美津也, 稲葉洋平, 千田浩一, 稲葉洋平, 千田浩一

    日本診療放射線技師会誌 71 (10) 2024

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  4. Initial study of radiation protection effect of goggles-shaped 0.75 mm Pb glasses

    進藤僚太, 藤沢昌輝, 山本啓介, 稲葉洋平, 千田浩一, 山本啓介, 稲葉洋平, 千田浩一

    日本診療放射線技師会誌 71 (10) 2024

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  5. Fundamental study on an improved drape for protection operator exposure in interventional radiology: investigation in the position of the operator’s crystalline lenses

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    日本診療放射線技師会誌 71 (10) 2024

    ISSN: 2187-2538

  6. Cellular effects induced by radioactive particles generated by the accident of Fukushima Daiichi nuclear power plant

    和泉哉汰, 鈴木正敏, 遠藤暁, 佐藤拓, 稲葉洋平, 福本学, 千田浩一, 和泉哉汰, 鈴木正敏, 佐藤拓, 稲葉洋平, 福本学, 千田浩一

    日本診療放射線技師会誌 71 (10) 2024

    ISSN: 2187-2538

  7. Performance verification of new whole-body surface contamination inspection device

    田辺真子, 田辺真子, 中村美緒, 中村美緒, 阿部喜弘, 越智隆浩, 稲葉洋平, 稲葉洋平, 細井義夫, 細井義夫, 千田浩一

    日本放射線安全管理学会誌 23 (2) 2024

    ISSN: 1347-1503

  8. Evaluation of Physician’s Radiation Eye Dose during Bronchoscopy under X-ray Fluoroscopy

    高平咲希, 芳賀喜裕, 芳賀喜裕, 曽田真宏, 曽田真宏, 阿部美津也, 加賀勇治, 木村雄一郎, 稲葉洋平, 稲葉洋平, 千田浩一

    日本放射線安全管理学会誌 23 (2) 2024

    ISSN: 1347-1503

  9. X線防護眼鏡の下部と頬部との隙間がもたらす放射線業務従事者の水晶体の被ばく防護効果の低下に関する初期検討

    進藤僚太, 大野紗耶, 今田聡恵, 山本啓介, 山本啓介, 稲葉洋平, 稲葉洋平, 千田浩一

    FB News (564) 2023

    ISSN: 1349-6395

  10. コーンビームCT撮影における水晶体防護具の試作-防護具に用いる遮蔽物質の検討-

    川内覚, 川内覚, 千田浩一, 盛武敬, 濱田祐介, 依田彰吾, 佐久間秀之, 田野政勝, 田野政勝

    日本放射線技術学会総会学術大会予稿集 76th 2020

    ISSN: 1884-7846

  11. 脳血管内治療における患者水晶体線量-水晶体被ばくの変遷と線量低減の試み-

    川内覚, 川内覚, 千田浩一, 盛武敬, 濱田祐介, 佐久間秀之, 依田彰吾, 澤山慧, 時森貴央, 阿部凌那, 鶴田和太郎, 細尾久幸, 藤谷茂太

    脳血管内治療(Web) 5 (Supplement) 2020

    ISSN: 2424-1709

  12. 直接胃X線透視検査の放射線被ばく線量と身体測定データの相関について

    根本 まなみ, 稲葉 洋平, 熊田 祐也, 千田 浩一

    総合健診 47 (1) 235-235 2020/01

    Publisher: (一社)日本総合健診医学会

    ISSN: 1347-0086

  13. 血管造影IVRにおける空間散乱線量等の測定評価 ファントム実験による基礎検討

    大森 悠斗, 巻 周星, 大友 一輝, 芳賀 善裕, 稲葉 洋平, 加賀 勇治, 阿部 美津也, 千田 浩一

    日本放射線技術学会雑誌 75 (9) 993-993 2019/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  14. 0.75mm鉛当量防護眼鏡による水晶体等価線量の低減に関する臨床的検討

    遠藤 美芽, 芳賀 喜裕, 阿部 美津也, 加賀 勇治, 大友 一輝, 村林 優樹, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 75 (9) 1026-1026 2019/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  15. 高校生における放射線に関する知識の特徴と放射線防護へ向けた教育

    大葉 隆, 稲葉 洋平, 津山 尚宏, 坪倉 正治, 村上 道夫, 千田 浩一, 大津留 晶

    JART: 日本診療放射線技師会誌 66 (9) 988-988 2019/09

    Publisher: (公社)日本診療放射線技師会

    ISSN: 2187-2538

  16. 3mm線量当量線量計の基本特性評価:IVR用X装置を用いた検討

    田母神陽, 有馬悠貴, 大友一輝, 齊藤新, 菅原拓巳, 田辺ゆうき, 石井浩生, 薩來康, 芳賀喜裕, 芳賀喜裕, 加賀勇治, 千田浩一, 千田浩一

    日本放射線技術学会東北支部雑誌(Web) (28) 2019

  17. 移動型X線装置の空間散乱X線量の測定-ファントム撮影による検討-

    菅原拓巳, 大友一輝, 齊藤新, 田母神陽, 有馬悠貴, 田辺ゆうき, 石井浩生, 薩來康, 芳賀喜裕, 芳賀喜裕, 加賀勇治, 千田浩一, 千田浩一

    日本放射線技術学会東北支部雑誌(Web) (28) 2019

  18. 心血管IVRに携わるスタッフの水晶体線量評価 リアルタイム線量測定による基礎検討

    石井 浩生, 薩來 康, 芳賀 喜裕, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北部会雑誌 (28) 173-174 2019/01

    Publisher: (公社)日本放射線技術学会-東北支部

  19. 空間散乱X線測定による実効エネルギー変換係数の算出

    薩來 康, 石井 浩生, 千田 浩一, 稲葉 洋平, 芳賀 喜裕, 加賀 勇治

    日本放射線技術学会東北部会雑誌 (28) 233-234 2019/01

    Publisher: (公社)日本放射線技術学会-東北支部

  20. IVRに従事するスタッフの水晶体線量計着用部位に関する基礎検討

    石井 浩生, 薩來 康, 芳賀 喜裕, 加賀 勇治, 阿部 美津也, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 74 (9) 1095-1095 2018/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  21. 空間散乱X線のエネルギー測定による放射線防護眼鏡の鉛当量厚の検討

    薩來 康, 石井 浩生, 芳賀 喜裕, 加賀 勇治, 佐藤 文貴, 本田 崇文, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 74 (9) 1096-1096 2018/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  22. 診断領域エネルギにおける水晶体職業被ばく測定用線量計の基本特性評価 安定性およびFadingに関する検討

    田辺 ゆうき, 田母神 陽, 菅原 拓巳, 石井 浩生, 芳賀 喜裕, 稲葉 洋平, 加賀 勇治, 千田 浩一

    日本放射線技術学会雑誌 74 (9) 1096-1096 2018/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  23. ポータブル撮影における空間散乱線量評価に関する基礎検討

    大友 一輝, 有馬 悠貴, 齊藤 新, 芳賀 喜裕, 阿部 美津也, 加賀 勇治, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 74 (9) 1100-1100 2018/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  24. マルチチャネルリアルタイムモニタを用いた新規放射線量計の有用性(Usefulness of Novel Radiation Dosimeter Using a Multi-channel Real-time Monitor)

    Inaba Yohei, Ishii Hiroki, Satsurai Ko, Haga Yoshihiro, Chida Koichi

    日本放射線技術学会総会学術大会予稿集 74回 304-304 2018/03

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  25. 空間散乱X線平均エネルギー測定:ファントムの違いが平均エネルギー値に与える影響

    薩來康, 石井浩生, 芳賀喜裕, 加賀勇治, 稲葉洋平, 稲葉洋平, 千田浩一, 千田浩一

    日本放射線安全管理学会学術大会講演予稿集 17th 2018

  26. リアルタイム個人線量計を用いたIVRスタッフの水晶体線量に関する基礎的検討

    石井浩生, 薩來康, 芳賀喜裕, 芳賀喜裕, 加賀勇治, 阿部美津也, 稲葉洋平, 稲葉洋平, 千田浩一, 千田浩一

    日本放射線安全管理学会学術大会講演予稿集 17th 2018

  27. コーンビームCT撮影における水晶体防護具の検討

    川内覚, 川内覚, 千田浩一, 盛武敬, 濱田祐介, 澤山慧, 鶴田和太郎, 孫略, 田野政勝, 田野政勝

    日本放射線技術学会雑誌 74 (9) 2018

    ISSN: 0369-4305

  28. Changes in blood antioxidant capacity after irradiation: A novel biodosimetry method

    盛武敬, SUN Lue, 稲葉洋平, 千田浩一

    電子スピンサイエンス学会年会講演要旨集 57th 2018

  29. 血流改変ステントを用いた脳動脈瘤治療における患者被ばく線量-患者因子・手技因子と被ばく線量の関係-

    川内覚, 川内覚, 千田浩一, 盛武敬, 濱田祐介, 佐久間秀之, 孫略, 松丸祐司, 鶴田和太郎, 細尾久幸, 田野政勝, 田野政勝

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  30. 天吊り防護板による従事者被曝線量の防護効果検証

    一ツ木 康晶, 安部 圭亮, 小野寺 真奈, 鈴木 友裕, 高橋 拓己, 稲葉 洋平, 千田 浩一, 佐藤 文貴, 本田 崇文, 石井 浩生, 薩來 康, 立花 茂, 島田 一生, 杉山 周平

    日本放射線技術学会東北部会雑誌 (27) np135-np136 2018/01

    Publisher: (公社)日本放射線技術学会-東北支部

  31. 水晶体線量計の3mm線量当量測定に関する基礎的検討 70μm線量当量および1cm線量当量との比較

    高橋 拓己, 安部 圭亮, 小野寺 真奈, 鈴木 友裕, 一ツ木 康昌, 石井 浩生, 薩來 康, 上杉 直人, 加藤 槙子, 三戸 麻莉菜, 芳賀 喜裕, 阿部 美津也, 加賀 勇治, 稲葉 洋平, 千田 浩一, 大口 裕之

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  32. 水晶体被ばく線量計の基本的性能評価に関する基礎検討

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  33. 新型半導体式サーベイメータの空間散乱X線平均エネルギー測定精度評価

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  34. CTガイド下生検における医療スタッフの被曝線量の実測 動画を用いた分析

    本田 崇文, 石井 浩生, 薩來 康, 佐藤 文貴, 稲葉 洋平, 千田 浩一, 立花 茂, 常陸 真

    日本放射線技術学会東北部会雑誌 (27) np199-np200 2018/01

    Publisher: (公社)日本放射線技術学会-東北支部

  35. 血管造影・IVRに携わる医療スタッフの水晶体線量の左右差に関する基礎的検討

    石井 浩生, 薩來 康, 本田 崇文, 佐藤 文貴, 稲葉 洋平, 千田 浩一, 上杉 直人, 加藤 槙子, 芳賀 喜裕, 加賀 勇治

    日本放射線技術学会東北部会雑誌 (27) np239-np240 2018/01

    Publisher: (公社)日本放射線技術学会-東北支部

  36. IVRに従事する医師・看護師における左右の水晶体線量についての検討

    佐藤 文貴, 稲葉 洋平, 千田 浩一, 本田 崇文, 芳賀 喜裕, 加賀 勇治

    日本放射線技術学会東北部会雑誌 (27) np241-np242 2018/01

    Publisher: (公社)日本放射線技術学会-東北支部

  37. コーンビームCT撮影におけるビスマスシールドを用いた水晶体被ばく線量の低減

    川内 覚, 千田 浩一, 盛武 敬, 濱田 祐介, 佐久間 秀之, 松丸 祐司, 鶴田 和太郎, 田野 政勝

    日本放射線技術学会雑誌 73 (9) 961-962 2017/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

  38. PCI及びPercutaneous Peripheral Intervention(PPI)に従事する医師における水晶体被ばく線量の左右差についての初期的検討

    佐藤 文貴, 本田 崇文, 芳賀 喜裕, 石井 浩生, 薩來 康, 稲葉 洋平, 加賀 勇治, 千田 浩一

    日本放射線技術学会雑誌 73 (9) 841-841 2017/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  39. IVR装置における患者照射基準点線量の測定及び線量表示値との比較

    本田 崇文, 佐藤 文貴, 石井 浩生, 薩來 康, 稲葉 洋平, 立花 茂, 加賀 勇治, 千田 浩一

    日本放射線技術学会雑誌 73 (9) 912-912 2017/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  40. 新型半導体式サーベイメータの基礎検討 散乱X線平均エネルギー測定精度の検討

    薩來 康, 石井 浩生, 佐藤 文貴, 本田 崇文, 稲葉 洋平, 千田 浩一, 宮田 恒平, 三戸 麻莉菜

    日本放射線技術学会雑誌 73 (9) 914-914 2017/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  41. IVR装置間における患者照射基準点線量測定から見えてきた実測の重要性

    稲葉 洋平, 本田 崇文, 佐藤 文貴, 芳賀 喜裕, 千田 浩一

    IVR: Interventional Radiology 32 (Suppl.) 260-260 2017/04

    Publisher: (一社)日本インターベンショナルラジオロジー学会

    ISSN: 1340-4520

    eISSN: 2185-6451

  42. マルチチャネルリアルタイムモニタを用いた新規の放射線線量計に関する基礎研究(Fundamental Study of a Novel Radiation Dosimeter Using a Multi-Channel Real-Time Monitor)

    Inaba Yohei, Honda Takfumi, Sato Fumitaka, Chida Koichi, Haga Yoshihiro, Kaga Yuji

    日本放射線技術学会総会学術大会予稿集 73回 288-288 2017/03

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  43. 熱蛍光線量計(LiF素子)のフェーディングに関する評価

    鈴木友裕, 一ツ木康晶, 石井浩生, 上杉直人, 宮田恒平, 芳賀喜裕, 芳賀喜裕, 加賀勇治, 千田浩一, 千田浩一

    日本放射線技術学会雑誌 73 (9) 2017

    ISSN: 0369-4305

  44. IVRに従事する医師及び看護師の水晶体線量の左右差に関する基礎検討:ファントム実験による検討

    石井浩生, 薩來康, 佐藤文貴, 上杉直人, 加藤槙子, 芳賀喜裕, 加賀勇治, 千田浩一, 千田浩一

    日本放射線技術学会雑誌 73 (9) 2017

    ISSN: 0369-4305

  45. 血中脂質ラジカル消去能を指標とした放射線影響測定

    孫略, 孫略, 稲葉洋平, 佐藤圭創, 平山暁, 坪井康次, 千田浩一, 盛武敬

    日本酸化ストレス学会学術集会プログラム・抄録集 70th 2017

  46. JSNET防護委員会で今後行うDRL調査について

    川内覚, 川内覚, 松丸祐司, 盛武敬, 安陪等思, 庄島正明, 早川幹人, 坂本肇, 人見剛, 濱田祐介, 鶴田和太郎, 千田浩一, 田野政勝, 田野政勝

    脳血管内治療(Web) 2 (Supplement) 2017

    ISSN: 2424-1709

  47. 血流改変ステントを用いた脳動脈瘤治療における患者被ばく線量

    川内覚, 川内覚, 千田浩一, 盛武敬, 濱田祐介, 佐久間秀之, 依田彰吾, 孫略, 松丸祐司, 鶴田和太郎, 細尾久幸, 堂福翔吾, 田野政勝, 田野政勝

    脳血管内治療(Web) 2 (Supplement) 2017

    ISSN: 2424-1709

  48. Changes in blood antioxidant capacity after irradiation: A novel biodosimetry method

    SUN Lue, SUN Lue, 稲葉洋平, 佐藤圭創, 平山暁, 千田浩一, 盛武敬

    電子スピンサイエンス学会年会講演要旨集 56th 2017

  49. 心血管IVR装置間における患者照射基準点線量の実測と線量表示値の比較

    上杉 直人, 石井 浩生, 宮田 恒平, 加藤 槙子, 三戸 麻莉菜, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北部会雑誌 (26) np178-np179 2017/01

    Publisher: (公社)日本放射線技術学会-東北支部

  50. 新型半導体式サーベイメータの基本特性評価

    宮田 恒平, 石井 浩生, 三戸 麻莉菜, 加藤 槙子, 上杉 直人, 千田 浩一, 稲葉 洋平, 本田 崇文, 佐藤 文貴, 斎 政博, 加賀 勇治, 芳賀 喜裕

    日本放射線技術学会東北部会雑誌 (26) np190-np191 2017/01

    Publisher: (公社)日本放射線技術学会-東北支部

  51. 血管造影・IVRに従事する医師、看護師の被曝線量の検討

    佐藤 文貴, 稲葉 洋平, 千田 浩一, 本田 崇文, 片岡 望, 熊坂 江里子, 芳賀 喜裕, 阿部 美津也, 加賀 勇治

    日本放射線技術学会東北部会雑誌 (26) np194-np194 2017/01

    Publisher: (公社)日本放射線技術学会-東北支部

  52. CT透視下生検における術者被曝線量計の位置に関する検討

    本田 崇文, 佐藤 文貴, 稲葉 洋平, 千田 浩一, 常陸 真

    日本放射線技術学会東北部会雑誌 (26) np198-np199 2017/01

    Publisher: (公社)日本放射線技術学会-東北支部

  53. 半導体センサを使用した新しいサーベイメータの基礎検討

    石井 浩生, 宮田 恒平, 三戸 麻莉菜, 加藤 槙子, 佐藤 文貴, 本田 崇文, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 72 (9) 841-842 2016/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  54. センサーの違いによるリアルタイム型MOSFET線量計の基本特性評価

    佐藤 文貴, 千田 浩一, 稲葉 洋平, 本田 崇文, 芳賀 喜裕, 加賀 勇治, 上杉 直人

    日本放射線技術学会雑誌 72 (9) 842-842 2016/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  55. X線CT透視時のX線CT装置間での空間散乱線分布の比較 ファントム実験

    本田 崇文, 稲葉 洋平, 千田 浩一, 川畑 朋桂, 森 隆一, 佐藤 文貴, 立花 茂, 梁川 功

    日本放射線技術学会雑誌 72 (9) 860-860 2016/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  56. 自作線量管理ソフトウェアを用いたCT検査における線量情報の収集とDRLs2015との比較

    田頭 豊, 志村 浩孝, 坂本 博, 佐藤 和宏, 梁川 功, 千田 浩一, 麦倉 俊司

    日本放射線技術学会雑誌 72 (9) 818-819 2016/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  57. 胃癌検診におけるディジタルラジオグラフィー装置の有用性 : アナログ装置との比較評価

    星 千春, 金子 貴安, 千田 浩一

    臨床放射線 61 (8) 1061-1068 2016/08

    Publisher: 金原出版

    ISSN: 0009-9252

  58. CT透視下生検における従事者被曝線量の実測

    稲葉 洋平, 千田 浩一, 常陸 真, 綿貫 宗則

    IVR: Interventional Radiology 31 (Suppl.) 302-302 2016/04

    Publisher: (一社)日本インターベンショナルラジオロジー学会

    ISSN: 1340-4520

    eISSN: 2185-6451

  59. 一般X線撮影領域におけるRISを用いた患者被曝管理システムの構築

    田野 政勝, 千田 浩一

    臨床放射線 61 (3) 491-495 2016/03

    Publisher: 金原出版

    ISSN: 0009-9252

  60. 多施設心血管IVR装置における患者照射基準点線量の実測 DRLs2015との考察

    稲葉 洋平, 千田 浩一, 小林 亮太, 梁川 功, 加賀 勇治

    日本放射線技術学会総会学術大会予稿集 72回 241-241 2016/02

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  61. 水晶体職業被ばく評価用の新型3mm線量当量測定器の基礎的性能評価

    加藤槙子, 三戸麻莉菜, 上杉直人, 石井浩生, 宮田恒平, 芳賀喜裕, 芳賀喜裕, 加賀勇治, 千田浩一, 千田浩一

    日本放射線技術学会雑誌 72 (9) 2016

    ISSN: 0369-4305

  62. 蛍光ガラス線量計を用いた脳血管内手術における水晶体線量の評価

    川内覚, 川内覚, 盛武敬, 濱田祐介, 佐久間秀之, 千田浩一, 松丸祐司, 田野政勝, 田野政勝

    日本放射線技術学会総会学術大会予稿集 72nd 2016

    ISSN: 1884-7846

  63. コーンビームCT撮影における頭部被ばく線量の評価

    川内覚, 濱田祐介, 依田彰吾, 佐久間秀之, 島田昌典, 田野政勝, 川内覚, 千田浩一, 田野政勝, 盛武敬, 松丸祐司

    日本放射線技術学会東京支部雑誌 (130) 2016

    ISSN: 2189-8472

  64. リアルタイム線量計を用いたカテーテルアブレーション時の患者被ばく線量測定に関する基礎検討

    加藤守, 加藤守, 千田浩一, 盛武敬, 佐々木文昭, 大阪肇, 豊嶋英仁

    日本放射線技術学会総会学術大会予稿集 72nd 2016

    ISSN: 1884-7846

  65. 線量測定フィルムを用いたPCI時の患者被ばく線量過大評価に関する検討

    加藤守, 加藤守, 千田浩一, 盛武敬, 佐々木文昭, 大村知己, 大阪肇, 高橋規之, 豊嶋英仁

    日本放射線技術学会雑誌 72 (9) 2016

    ISSN: 0369-4305

  66. 患者被曝測定におけるリアルタイム型MOSFET線量計の基本特性評価

    鈴木 智之, 佐藤 文貴, 本田 崇文, 村上 巧, 千田 浩一, 稲葉 洋平, 芳賀 喜裕, 加賀 勇治

    日本放射線技術学会東北部会雑誌 (25) 201-201 2016/01

    Publisher: (公社)日本放射線技術学会-東北支部

  67. CT装置間におけるCT透視時の空間散乱線分布の比較

    本田 崇文, 佐藤 文貴, 鈴木 智之, 村上 巧, 稲葉 洋平, 千田 浩一, 川畑 朋桂, 森 隆一, 佐久間 政志, 立花 茂, 梁川 功

    日本放射線技術学会東北部会雑誌 (25) 207-207 2016/01

    Publisher: (公社)日本放射線技術学会-東北支部

  68. 心血管撮影装置における回転撮影時の患者被曝線量分布と被曝低減法

    加藤 守, 千田 浩一, 盛武 敬

    映像情報medical 47 (9) 924-929,842-843 2015/09

    Publisher: 産業開発機構

    ISSN: 1346-1354

  69. 血管造影用X線装置間の空間散乱線量の比較

    根本 まなみ, 小林 亮太, 稲葉 洋平, 芳賀 喜裕, 千田 浩一

    日本放射線技術学会雑誌 71 (9) 842-842 2015/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  70. MOSFETリアルタイム線量計の測定精度に関する基礎検討

    佐藤 文貴, 村上 巧, 鈴木 智之, 本田 崇文, 稲葉 洋平, 芳賀 喜裕, 加賀 勇治, 千田 浩一

    日本放射線技術学会雑誌 71 (9) 891-891 2015/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  71. IVR-CT装置のCT透視時における空間散乱線分布の測定

    村上 巧, 本田 崇文, 佐藤 文貴, 鈴木 智之, 稲葉 洋平, 千田 浩一, 立花 茂, 梁川 功

    日本放射線技術学会雑誌 71 (9) 892-892 2015/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  72. Estimation of Maximum Entrance Skin Dose during Cerebral Angiography

    川内覚, 川内覚, 盛武敬, 早川幹人, 濱田祐介, 佐久間秀之, 依田彰吾, 佐藤允之, 孫略, 小口靖弘, 赤羽恵一, 千田浩一, 松丸祐司

    日本放射線技術学会雑誌 71 (9) 746-757 (J-STAGE)-757 2015/09

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.2015_JSRT_71.9.746  

    ISSN: 0369-4305

    More details Close

    Using radio-photoluminescence glass dosimeter, we measured the entrance skin dose (ESD) in 46 cases and analyzed the correlations between maximum ESD and angiographic parameters [total fluoroscopic time (TFT); number of digital subtraction angiography (DSA) frames, air kerma at the interventional reference point (AK), and dose-area product (DAP)] to estimate the maximum ESD in real time. Mean (± standard deviation) maximum ESD, dose of the right lens, and dose of the left lens were 431.2±135.8 mGy, 33.6±15.5 mGy, and 58.5±35.0 mGy, respectively. Correlation coefficients (r) between maximum ESD and TFT, number of DSA frames, AK, and DAP were r=0.379 (P&lt;0.01), r=0.702 (P&lt;0.001), r=0.825 (P&lt;0.001), and r=0.709 (P&lt;0.001), respectively. AK was identified as the most useful parameter for real-time prediction of maximum ESD. This study should contribute to the development of new diagnostic reference levels in our country.

  73. 当施設における冠動脈CT線量と診断参考レベルとの比較検討

    加藤守, 加藤守, 千田浩一, 盛武敬, 佐々木文昭, 大村知己, 大阪肇, 高橋規之, 豊嶋英仁

    日本放射線技術学会雑誌 71 (9) 2015

    ISSN: 0369-4305

  74. 水晶体被ばくの現状と多施設被ばく線量測定による新たな可能性

    川内覚, 川内覚, 盛武敬, 濱田祐介, 依田彰吾, 佐久間秀之, 佐藤允之, 松丸祐司, 孫略, 千田浩一, 田野政勝, 田野政勝

    Journal of Neuroendovascular Therapy 9 (6) 2015

    ISSN: 1882-4072

  75. 脳血管撮影における蛍光ガラス線量計を用いた最大入射皮膚線量の推測-脳血管内手術と診断血管撮影による比較-

    川内覧, 川内覧, 盛武敬, 濱田祐介, 依田彰吾, 佐久間秀之, 佐藤允之, 松丸祐司, 孫略, 千田浩一, 田野政勝, 田野政勝

    Journal of Neuroendovascular Therapy 9 (6) 2015

    ISSN: 1882-4072

  76. 心臓IVRにおける最大入射皮膚線量と乳房線量に関する基礎的検討

    加藤守, 加藤守, 千田浩一, 盛武敬, 佐々木文昭, 佐々木正文, 大阪肇, 土佐鉄雄

    日本放射線技術学会総会学術大会予稿集 71st 2015

    ISSN: 1884-7846

  77. Regression Analysis on Decay Curve of Contaminated Environment of Fukushima Nuclear Plant Accident Using Time Sequential Change of γ Ray Counting and Space Dose Rate

    24 (2) 89-105 2015

    Publisher: 東北大学医学部保健学科

    ISSN: 1348-8899

  78. 平面検出器搭載型X線装置用QCファントムとQCデータ管理ソフトウェアの開発

    芳賀 喜裕, 千田 浩一, 加賀 勇治

    映像情報medical 47 (1) 59-66 2015/01

    Publisher: 産業開発機構

    ISSN: 1346-1354

  79. 血管造影IVR装置の空間散乱X線量の多施設比較

    松田 拓馬, 三瓶 司, 稲野 理穂, 伊藤 拓未, 小林 亮太, 稲葉 洋平, 千田 浩一

    日本放射線技術学会東北部会雑誌 (24) 163-163 2015/01

    Publisher: (公社)日本放射線技術学会-東北支部

  80. 新しい非接続型X線アナライザの性能評価(第一報)(管電圧測定等に関する検討)

    稲野 理穂, 伊藤 拓未, 三瓶 司, 松田 拓馬, 小林 亮太, 稲葉 洋平, 千田 浩一, 芳賀 善裕, 加賀 勇治

    日本放射線技術学会東北部会雑誌 (24) 198-198 2015/01

    Publisher: (公社)日本放射線技術学会-東北支部

  81. 新しい非接続型X線アナライザの性能評価(第二報)(撮影時間測定やその他の特性に関する検討)

    三瓶 司, 伊藤 拓未, 稲野 理穂, 松田 拓馬, 小林 亮太, 稲葉 洋平, 千田 浩一, 芳賀 善裕, 加賀 勇治

    日本放射線技術学会東北部会雑誌 (24) 199-199 2015/01

    Publisher: (公社)日本放射線技術学会-東北支部

  82. 心血管IVR装置間における線量と画質の関係

    稲葉 洋平, 小林 亮太, 千田 浩一, 梁川 功, 加賀 勇治

    日本放射線技術学会雑誌 70 (9) 986-986 2014/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  83. 新しい非接続形X線測定器の線量測定精度の基礎検討

    伊藤 拓未, 稲野 理穂, 三瓶 司, 松田 拓馬, 小林 亮太, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 70 (9) 988-988 2014/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  84. 太陽光発電システムを用いた災害時診断用携帯型X線発生装置の開発

    小林 亮太, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 70 (9) 1062-1062 2014/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  85. Future Direction of Image-Guided Radiotherapy for Localized Prostate Cancer for more Precise and Conformal Treatment Delivery

    Ken Takeda, Rei Umezawa, Yohjiro Ishikawa, Noriyuki Kadoya, Kengo Ito, Toshiyuki Sugawara, Masaki Kubozono, Takaya Yamamoto, Maiko Kozumi, Suguru Dobashi, Koichi Chida, Haruo Matsushita, Keichi Jingu

    J Radiol Radiat Ther 2014/07/01

    Publisher: SciMedCentral

  86. 災害時診断用携帯型X線発生装置の試作

    小林 亮太, 稲葉 洋平, 千田 浩一

    日本放射線技術学会総会学術大会予稿集 70回 190-191 2014/02

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  87. 多施設の心血管IVR装置における入射線量縦断調査

    稲葉 洋平, 千田 浩一, 小林 亮太, 加賀 勇治, 梁川 功

    日本放射線技術学会総会学術大会予稿集 70回 250-251 2014/02

    Publisher: (公社)日本放射線技術学会

    ISSN: 1884-7846

  88. 心血管造影時における線量測定方法の違いによる入射線量の違いの要因についての検討

    加藤守, 加藤守, 千田浩一, 盛武敬, 松本和規, 佐々木文昭, 佐々木正文, 大阪肇, 土佐鉄雄

    日本放射線技術学会雑誌 70 (9) 2014

    ISSN: 0369-4305

  89. 心血管造影及び心臓CT時の患者皮膚線量を用いた被曝管理の検討

    加藤守, 加藤守, 千田浩一, 盛武敬, 佐藤匡也, 土佐鉄雄, 大阪肇

    日本心血管インターベンション治療学会誌 (Supplement (CD-ROM)) 2014

    ISSN: 1884-0027

  90. 班報告:心臓インターベンション時の皮膚入射線量実測による多施設線量評価

    加藤守, 加藤守, 千田浩一, 盛武敬, 小口靖弘, 加賀勇治, 坂本肇, 塚本篤子, 松本一真

    日本放射線技術学会雑誌 70 (9) 2014

    ISSN: 0369-4305

  91. 医療従事者用リアルタイム被曝測定システムの有用性(第1報)(測定系固有特性)

    稲葉 洋平, 千田 浩一, 小林 亮太, 加賀 勇治, 芳賀 喜裕, 梁川 功

    日本放射線技術学会東北部会雑誌 (23) 172-172 2014/01

    Publisher: (公社)日本放射線技術学会-東北支部

  92. 医療従事者用リアルタイム被曝測定システムの有用性(第2報)(性能比較)

    長島 慎弥, 中村 昌隆, 砂村 あゆみ, 曽田 真宏, 稲葉 洋平, 千田 浩一, 加賀 勇治, 芳賀 喜裕

    日本放射線技術学会東北部会雑誌 (23) 173-173 2014/01

    Publisher: (公社)日本放射線技術学会-東北支部

  93. X線診断領域における新型個人線量計の基礎的評価

    稲葉 洋平, 千田 浩一, 小林 亮太, 梁川 功, 加賀 勇治

    日本放射線技術学会雑誌 69 (9) 1026-1026 2013/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  94. リアルタイム型ポケット線量計の性能比較

    中村 昌隆, 砂村 あゆみ, 曽田 真宏, 長島 慎弥, 稲葉 洋平, 千田 浩一

    日本放射線技術学会雑誌 69 (9) 1026-1026 2013/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  95. 心臓カテーテルに携わる医療スタッフの被曝線量評価(放射線防護分科会パネルディスカション「線量管理はできるのか?できないのか?」,第36回放射線防護分科会)

    片岡 望, 熊坂 江里子, 芳賀 喜裕, 鈴木 新一, 荒井 剛, 加賀 勇治, 阿部 千里, 千田 浩一

    放射線防護分科会会誌 (36) 63-64 2013/04/11

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  96. FPD用QCファントムにおける試作品質管理ソフトの作成(放射線防護分科会パネルディスカション「線量管理はできるのか?できないのか?」,第36回放射線防護分科会)

    芳賀 喜裕, 荒井 剛, 鈴木 新一, 片岡 望, 熊坂 江里子, 加賀 勇治, 千田 浩一, 横内 悟朗

    放射線防護分科会会誌 (36) 65-66 2013/04/11

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  97. 未成年者の心臓IVRにおける蛍光ガラス線量計を用いた患者被曝線量測定法

    加藤守, 加藤守, 千田浩一, 盛武敬, 小口靖弘, 佐々木正文, 大阪肇, 土佐鉄雄

    日本放射線技術学会総会学術大会予稿集 69th 2013

    ISSN: 1884-7846

  98. Direct measurement of patient’s entrance skin dose during pediatric cardiac catheterization

    孫略, 水野祐介, 岩本眞理, 後藤隆久, 小口靖弘, 坪井康次, 千田浩一, 盛武敬

    日本放射線技術学会雑誌 69 (9) 2013

    ISSN: 0369-4305

  99. 班報告:心臓インターベンション時の皮膚入射線量実測による多施設線量評価

    加藤守, 加藤守, 千田浩一, 盛武敬, 小口靖弘, 加賀勇治, 坂本肇, 塚本篤子, 川内覚

    日本放射線技術学会雑誌 69 (9) 2013

    ISSN: 0369-4305

  100. Tohoku University

    町田 子男, 石橋 忠司, 千田 浩一, 武田 賢, 田村 元, 森 一生, 齊藤 春夫, 細貝 良行

    Japanese Journal of Radiological Technology 68 (7) 926-931 2012/07/20

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.2012_JSRT_68.7.926  

    ISSN: 0369-4305

  101. 放射線の人体影響について (混相流)

    千田浩一

    混相流 26 (2) 128-132 2012/06

    Publisher: THE JAPANESE SOCIETY FOR MULTIPHASE FLOW

    DOI: 10.3811/jjmf.26.128  

    ISSN: 0914-2843

    More details Close

    The biological effects of radiation are of two types: stochastic (such as radiation‐induced cancer) and deterministic (such as erythema).The effective dose is used to assess the risk of stochastic effects, and the dose equivalent is used to assess the risk of deterministic effects. However, the effective dose and dose equivalent, body‐related protection quantities, are not measurable. Therefore, operational quantities (1‐cm dose equivalent and 70‐μm dose equivalent) are used to assess the effective dose and dose equivalent. Generally, the 1‐cm dose equivalent, determined using a monitoring badge, is used to assess effective dose, whereas the 70‐cm dose equivalent, determined using a monitoring badge, is used to assess dose equivalent. Furthermore, when using two monitoring badges, the 1‐cm dose equivalent of each badge is converted into the effective dose using calculation algorithms.

  102. [Medical and occupational radiation exposure: present situation and countermeasures]. (Nihon Rinsho)

    Chida Koichi

    Nihon Rinsho 70 (3) 479-484 2012/03

    Publisher: 日本臨床社

    ISSN: 0047-1852

  103. 【放射線障害-基礎・疫学から診療・安全対策まで-】 放射線防護と安全対策 医療被ばく・職業被ばくの現状と対策 (日本臨床)

    千田浩一

    日本臨床 70 (3) 479-484 2012/03

  104. 蛍光ガラス線量計を用いた心臓インターベンション時の患者入射皮膚線量測定の検討

    加藤守, 加藤守, 千田浩一, 盛武敬, 小口靖弘, 大阪肇, 土佐鉄雄

    日本放射線技術学会総会学術大会予稿集 68th 2012

    ISSN: 1884-7846

  105. X線TV装置日常点検ファントム使用時のファントムセッティング方法が及ぼす影響についての検討

    太田丞二, 太田丞二, 黒木亮寿, 佐藤孝行, 小浦基明, 千田浩一

    日本放射線技術学会総会学術大会予稿集 68th 2012

    ISSN: 1884-7846

  106. 血管撮影装置のQC・QAファントムの基礎的検討

    鈴木貴之, 太田丞二, 太田丞二, 進藤直久, 加藤充, 齋藤哲史, 渡辺仁志, 堀口光寿, 齋藤暢, 千田浩一

    日本心血管インターベンション治療学会誌 4 (Supplement 2) 2012

    ISSN: 1884-0027

  107. PCIの被曝線量と皮膚障害 (日本医事新報)

    千田浩一

    日本医事新報 (4553) 60-61 2011/07

  108. 経皮的冠動脈インターベンションにおける蛍光ガラス線量計を用いた患者被曝線量測定に関する基礎的検討

    加藤守, 千田浩一, 盛武敬, 赤羽恵一, 小口靖弘, 吉田恭平, 佐々木文昭, 佐々木正文, 大阪肇, 土佐鉄雄, 宗久雅人, 寺田健, 熊谷肇, 阿部芳久, 佐藤匡也, 門脇謙

    IVR 26 (Supplement) 261 2011/04/25

    ISSN: 1340-4520

  109. Flat Panel Detector(FPD)搭載血管撮影装置における蛍光ガラス線量計の諸特性について

    加藤守, 千田浩一, 磯辺智範, 盛武敬, 小口靖弘, 大阪肇, 土佐鉄雄

    日本放射線技術学会総会学術大会予稿集 67th 2011

    ISSN: 1884-7846

  110. 法医解剖前CT検査の初期経験

    川住祐介, 細貝良行, 高根侑美, 佐藤美帆, 臼井章仁, 齋藤春夫, 石橋忠司, 小倉隆英, 仲田栄子, 小山内実, 佐藤行彦, 千田浩一, 高井良尋, 田村元, 町田好男, 森一生, 高橋識志, 境純, 舟山真人

    Jpn J Radiol 29 (Suppl.I) 10-10 2011/01

    Publisher: (公社)日本医学放射線学会

    ISSN: 1867-1071

    eISSN: 1867-108X

  111. 医療被曝の最適化と放射線防護 (東北医学雑誌)

    千田浩一

    東北医学雑誌 122 (2) 155-159 2010/12

  112. Radiation Dose and Radiation Protection for Patients and Physicians During Interventional Procedure

    Koichi Chida, Mamoru Kato, Yutaka Kagaya, Masayuki Zuguchi, Haruo Saito, Tadashi Ishibashi, Shoki Takahashi, Shogo Yamada, Yoshihiro Takai

    JOURNAL OF RADIATION RESEARCH 51 (2) 97-105 2010/03

    DOI: 10.1269/jrr.09112  

    ISSN: 0449-3060

  113. Optimizing patient radiation dose in intervention procedures

    Koichi Chida, Mamoru Kato, Haruo Saito, Tadashi Ishibashi, Shoki Takahashi, Masahiro Kohzuki, Masayuki Zuguchi

    ACTA RADIOLOGICA 51 (1) 33-39 2010/02

    DOI: 10.3109/02841850903229141  

    ISSN: 0284-1851

  114. [Using X-ray machines that display the radiation dose 2. The relationship between maximum radiation skin dose and total entrance skin dose in cardiac interventional procedures] (Nippon Hoshasen Gijutsu Gakkai Zasshi)

    Chida Koichi

    Nippon Hoshasen Gijutsu Gakkai Zasshi 65 (10) 1432-1437 2009/10/20

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.65.1432  

    ISSN: 0369-4305

  115. 血管撮影装置の表示線量を活用しよう(心血管IVRにおいて)患者総入射皮膚線量と最大皮膚線量との関係 (日本放射線技術学会雑誌)

    千田浩一

    日本放射線技術学会雑誌 65 (10) 1432-1438 2009/10

    Publisher: Japanese Society of Radiological Technology

    DOI: 10.6009/jjrt.65.1432  

    ISSN: 0369-4305

  116. 血管撮影用X線装置における基準点線量の検討 基準点実測線量と装置表示線量の対比

    森島 貴顕, 千葉 浩生, 稲葉 洋平, 田浦 将明, 江端 綾子, 千田 浩一

    日本放射線技術学会雑誌 65 (9) 1306-1306 2009/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  117. 直接変換方式FPD搭載乳房X線撮影装置の表示乳腺線量と実測値との比較(第36回秋季学術大会放射線防護・管理関連後抄録)

    小野寺 理紗, 伊藤 道明, 佐竹 潔, 曽根田 佳子, 新田 敏夫, 千田 浩一

    放射線防護分科会会誌 (28) 35-35 2009/04/17

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  118. 短時間収集での核医学高解像度データ取得法の開発―SPECTへの応用―

    田中茂久, 細貝良行, 小田桐逸人, 丸岡伸, 千田浩一, 山田文夫, 加賀勇治

    日本放射線技術学会総会学術大会予稿集 65th 153 2009/02/27

  119. 短時間収集での核医学高解像度データ取得法の開発―理論ならびに基礎的検討―

    細貝良行, 田中茂久, 小田桐逸人, 丸岡伸, 千田浩一, 山田文夫, 加賀勇治

    日本放射線技術学会総会学術大会予稿集 65th 153 2009/02/27

  120. 拡散係数測定の基準物質選択に関する基礎的研究

    佐々木洋介, 小倉隆英, 町田好男, 森一生, 石橋忠司, 齋藤春夫, 丸岡伸, 高井良尋, 佐藤行彦, 千田浩一, 仲田栄子, 細貝良行, 田村元

    東北大学医学部保健学科紀要 18 (1) 45-51 2009

  121. MR撮像とアンギオグラフィー (東北大学医学部保健学科紀要)

    町田好男, 森一生, 小倉隆英, 齋藤春夫, 丸岡伸, 高井良尋, 石橋忠司, 千田浩一, 佐藤行彦, 細貝良行, 仲田栄子, 田村元

    東北大学医学部保健学科紀要 18 (1) 1-7 2009

  122. MR fast imaging and MR angiography

    町田好男ほか

    Bulletin of School of Health Sciences, Tohoku University 18 (1) 1-7 2009

    Publisher: 東北大学医学部保健学科

    ISSN: 1348-8899

  123. IVRにおける放射線障害 (放射線生物研究)

    千田浩一, 丸岡伸, 齋藤春夫, 石橋忠司, 高井良尋

    放射線生物研究 43 (4) 393-407 2008/12

    Publisher: 放射線生物研究会

    ISSN: 0441-747X

  124. 132 当施設におけるPCI時の放射線皮膚障害例の治癒経過(放射線管理 患者線量管理,第36回日本放射線技術学会秋季学術大会)

    加藤 守, 土佐 鉄雄, 佐藤 匡也, 千田 浩一, 丸岡 伸

    日本放射線技術學會雜誌 64 (9) 1099-1100 2008/09/20

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 0369-4305

  125. 129 直接変換方式FPD搭載乳房X線撮影装置の表示乳腺線量と実測値との比較(放射線管理 患者線量管理,第36回日本放射線技術学会秋季学術大会)

    小野寺 理紗, 佐竹 潔, 伊藤 道明, 曽根田 佳子, 新田 敏夫, 千田 浩一

    日本放射線技術學會雜誌 64 (9) 1099-1099 2008/09/20

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 0369-4305

  126. 心臓血管IVR用X線装置の散乱X線量の多施設比較

    結城 裕子, 竹川 弥香, 稲葉 洋平, 江端 綾子, 田浦 将明, 舛山 葉菜子, 千田 浩一

    日本放射線技術学会雑誌 64 (9) 1130-1130 2008/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  127. IVR術者被曝の計測評価と防護 (日本放射線技術学会雑誌)

    千田浩一

    日本放射線技術学会雑誌 64 (8) 1009-1014 2008/08

    Publisher: Japanese Society of Radiological Technology (JSRT)

    DOI: 10.6009/jjrt.64.1009  

    ISSN: 0369-4305

    More details Close

    Abstract is not available. (Article in Japanese)

  128. ワイドダイナミックタイプ新型蛍光量計の性能評価(第35回秋季学術大会放射線防護・管理関連後抄録)

    白鳥 和敏, 佐藤 静, 梁川 功, 千田 浩一, 稲葉 洋平, 江端 綾子, 田浦 将明

    放射線防護分科会会誌 (26) 31-31 2008/04/04

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  129. How computed tomography displays moving object?

    Haruo SAITO, Koichi CHIDA, Yoshiyuki HOSOKAI, Issei MORI, Yoshio MACHIDA, Hajime TAMURA, Shin MARUOKA, Yoshihiro TAKAI, Mikio OISHI, Yukihiko SATO, Noriyasu HOMMA, Takahide OGURA, Eiko NAKATA, Tadashi ISHIBASHI

    Bulletin of School of Health Sciences, Tohoku University 17 (1) 9-13 2008

    Publisher: 東北大学医学部保健学科

    ISSN: 1348-8899

    More details Close

    Double-contour images of the aortic root can be seen on the chest computed tomograms (CTs) (full-scan images). And some of them became unclear on each reconstructed half-sacn image. The major cause of these artifacts is cardiac motion. We simulate these artifacts with moving phantom and with the drawings of the trajectory geometries from the view of Gantry (X-ray tube and detectors). CT displays the moving object truly as its trajectory geometry from the view of Gantry.

  130. 心臓IVRにおける患者最大皮膚線量:その実態および各指標との関係 (全国循環器撮影研究会誌)

    千田 浩一

    全国循環器撮影研究会誌 20 48-54 2007/12

  131. 心血管IVRにおける患者被曝線量 : 最大皮膚線量部位に関する検討(第4報)(第63回総会学術大会放射線防護・管理関連後抄録)

    布田 憲司, 伊藤 道明, 佐竹 潔, 新田 敏夫, 千田 浩一, 加賀谷 豊, 梁川 功

    放射線防護分科会会誌 (25) 50-50 2007/10/26

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  132. ワイドダイナミックタイプ新型蛍光量計の性能評価

    白鳥 和敏, 千田 浩一, 佐藤 静, 稲葉 洋平, 江端 綾子, 田浦 将明, 梁川 功

    日本放射線技術学会雑誌 63 (9) 998-998 2007/09

    Publisher: (公社)日本放射線技術学会

    ISSN: 0369-4305

    eISSN: 1881-4883

  133. 心血管IVR(カテーテルアブレーション)における患者最大皮膚線量部位に関する基礎的検討(第34回秋季学術大会放射線防護・管理関連演題発表後抄録)

    布田 憲司, 伊藤 道明, 佐竹 潔, 新田 敏夫, 古田 明美, 千田 浩一, 加賀谷 豊, 梁川 功

    放射線防護分科会会誌 (24) 54-54 2007/04/13

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  134. IVRにおける患者および術者の被曝低減法

    千田 浩一, 齋藤 春夫, 洞口 正之, 高瀬 圭, 梁川 功, 加賀谷 豊, 石橋 忠司, 高井 良尋, 高橋 昭喜, 山田 章吾

    日本医学放射線学会学術集会抄録集 66回 S96-S96 2007/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 0048-0428

  135. Reduced compression mammography to reduce breast pain

    (23) 35-40 2007

    Publisher: 健康管理事業団

    ISSN: 1347-0795

  136. [Measurement of radiation exposure to the patients' during cardiac interventional procedures] (Nippon Hoshasen Gijutsu Gakkai Zasshi)

    Chida Koichi

    Nippon Hoshasen Gijutsu Gakkai Zasshi 62 (11) 1507-1515 2006/11/20

    Publisher: Japanese Society of Radiological Technology (JSRT)

    DOI: 10.6009/jjrt.62.1507  

    ISSN: 0369-4305

  137. 心血管IVRにおける患者被曝線量 : 最大皮膚線量部位に関する検討(第2報)(第62回総会学術大会放射線防護管理関連後抄録)

    布田 憲司, 新田 敏夫, 伊藤 道明, 千田 浩一, 加賀 谷豊, 梁川 功, 山田 章吾

    放射線防護分科会会誌 (23) 66-66 2006/10/19

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  138. 478 I.I〜被写体間密着方法の違いによる術者被ばく線量の比較(放射線管理 従事者被ばく・防護(IVR),一般研究発表,日本放射線技術学会 第34回秋季学術大会)

    小野寺 理紗, 高野 正彦, 森島 貴顕, 千葉 浩生, 佐藤 咲子, 千田 浩一

    日本放射線技術學會雜誌 62 (9) 1304-1305 2006/09/20

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 0369-4305

  139. 42 IVR基準点線量の基礎的検討 : 2装置間の比較(放射線管理 面積線量計・IVR基準点,一般研究発表,日本放射線技術学会 第34回秋季学術大会)

    森島 貴顕, 片柳 敬一, 早坂 隆行, 千葉 浩生, 片平 美明, 千田 浩一

    日本放射線技術學會雜誌 62 (9) 1202-1202 2006/09/20

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 0369-4305

  140. 414 心血管IVR(カテーテルアブレーション)における患者最大皮膚線量部位に関する基礎的検討(放射線管理 線量評価(心臓カテーテル検査),一般研究発表,日本放射線技術学会 第34回秋季学術大会)

    布田 憲司, 伊藤 道明, 佐竹 潔, 新田 敏夫, 古田 明美, 千田 浩一, 加賀 谷豊, 梁川 功

    日本放射線技術學會雜誌 62 (9) 1289-1289 2006/09/20

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 0369-4305

  141. 心血管IVRにおける患者被曝線量 : 最大皮膚線量の部位に関する基礎的検討(第33回秋季学術大会放射線防護管理関連演題発表後抄録)

    布田 憲司, 新田 敏夫, 伊藤 道明, 千田 浩一, 洞口 正之, 加賀 谷豊, 梁川 功, 高橋 昭喜

    放射線防護分科会会誌 (22) 33-33 2006/04/07

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  142. I.IおよびX線管焦点〜被写体間距離、およびFIDの違いによる患者皮膚入射線量低減効果の違い(第33回秋季学術大会放射線防護管理関連演題発表後抄録)

    小野寺 理紗, 高野 正彦, 千田 浩一, 森嶋 貴顕, 千葉 浩生, 佐藤 咲子

    放射線防護分科会会誌 (22) 35-35 2006/04/07

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  143. 心血管IVRにおいてパルス透視は患者被曝低減に役立つか?

    千田 浩一, 齋藤 春夫, 洞口 正之, 布田 憲司, 高井 良尋, 高橋 昭喜, 山田 章吾

    日本医学放射線学会学術集会抄録集 65回 S108-S108 2006/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 0048-0428

  144. Feasibility of rapid-sequence 31P-MRS of the heart in cardiac patients

    (18) 13-20 2005/11

    Publisher: 福田記念医療技術振興財団

  145. 新型リアルタイム患者皮膚被曝線量計の性能評価(第61回総会学術大会放射線防護管理関連後抄録)

    森島 貴顕, 千葉 浩生, 片平 美明, 千田 浩一, 小野寺 理紗

    放射線防護分科会会誌 (21) 44-44 2005/10/20

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  146. Estimating the maximum radiation skin dose during cardiac interventional procedures using the dose- area product, fluoroscopic time, and patient weight

    K. Chida, H. Saito, H. Otani, M. Zuguchi, H. Shimura, M. Nakada, S. Takahashi, K. Shirato

    EUROPEAN HEART JOURNAL 26 694-694 2005/09

    ISSN: 0195-668X

    eISSN: 1522-9645

  147. 心血管IVRにおける患者被曝線量:最大皮膚線量の部位に関する基礎的検討

    布田 憲司, 新田 敏夫, 伊藤 道明, 千田 浩一, 洞口 正之, 加賀谷 豊, 梁川 功, 高橋 昭喜

    日本放射線技術学会雑誌 61 (9) 1241-1241 2005/09

    Publisher: (公社)日本放射線技術学会

    DOI: 10.6009/jjrt.KJ00004028264  

    ISSN: 0369-4305

  148. パルス透視の被曝線量に関する実験的検討(第32回秋季学術大会放射線防護管理関連演題発表後抄録, <特集>第61回総会学術大会放射線防護分科会)

    布田 憲司, 中原 直人, 長川 正良, 千田 浩一

    放射線防護分科会会誌 (20) 28-28 2005/04/08

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  149. 心血管インターベンションにおける患者皮膚最大線量と,透視時間,面積線量,患者BMIの関係

    千田 浩一, 齋藤 春夫, 洞口 正之, 大谷 宏紀, 志村 浩孝, 高瀬 圭, 佐々木 正寿, 高橋 昭喜, 山田 章吾, 白土 邦男

    日本医学放射線学会学術集会抄録集 64回 S103-S103 2005/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 0048-0428

  150. 心臓カテーテル検査術者被曝防護における追加鉛防護具の有用性(第60回総会学術大会放射線防護管理関連演題発表後抄録)(<特集>第32回秋季学術大会放射線防護分科会)

    森島 貴顕, 佐々木 昌浩, 繁泉 和彦, 千葉 浩生, 千田 浩一

    放射線防護分科会会誌 (19) 31-31 2004/10/21

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  151. Development of Skin Exposure Dose Simulator for Angiography and IVR

    Risa ONODERA, Ikuko OGAWA, Shigeru TADA, Aki TOGASHI, Kouichi CHIDA, Shigeru TACHIBANA, Mitsuru NAKATA, Noriyasu HOMMA, Department of Radiological Technology College of Medical Sciences Tohoku University, Department of Radiological Technology College of Medical Sciences Tohoku University, Department of Radiological Technology College of Medical Sciences Tohoku University, Department of Radiological Technology College of Medical Sciences Tohoku University, Department of Radiological Technology School of Health Sciences Faculty of Medicine Tohoku University, Department of Radiology Tohoku University Hospital, Department of Radiology Tohoku University Hospital, Department of Radiological Technology School of Health Sciences Faculty of Medicine Tohoku University

    Bulletin of School of Health Sciences, Tohoku University 13 (2) 93-100 2004/07/31

    Publisher: 東北大学医学部保健学科

    ISSN: 1348-8899

  152. デジタルシネ心血管撮影装置によって皮膚被曝は低減したか?

    齋藤 春夫, 千田 浩一, 高瀬 圭, 石橋 忠司, 佐藤 明弘, 山田 隆之, 松橋 俊夫, 洞口 正之, 高橋 昭喜

    日本医学放射線学会雑誌 64 (2) S289-S289 2004/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 0048-0428

  153. Improved Methods of Human Cardiac ^<31>P-MR Spectroscopy

    CHIDA Koichi, NAGASAKA Tatsuo, SAITO Haruo, SASAKI Masatoshi, ZUGUCHI Masayuki, KOHZUKI Masahiro

    22 180-181 2002/04/04

    ISSN: 1345-5354

  154. 411 グリッド制御X線管におけるパルス透視の検討

    伊藤 大輔, 千田 浩一, 佐藤 弘之, 佐藤 州彦, 渡邉 暁, 中田 充, 岸 和馬, 桑子 愛美, 渡邊 貴志, 佐々木 正寿

    日本放射線技術学会総会学術大会一般研究発表後抄録 (56) 393-393 2000

    Publisher: 日本放射線技術学会

  155. X線検査 : DR被曝

    千田 浩一

    放射線防護分科会会誌 (9) 15-15 1999/10/28

    Publisher: 公益社団法人日本放射線技術学会

    ISSN: 1345-3246

  156. 398 小児心室造影における心電図同期拡張期造影剤分割注入法の検討

    渡辺 暁, 千田 浩一, 佐藤 州彦, 三井 伸弥, 石屋 博樹, 佐々木 正寿, 田中 高志

    日本放射線技術学会総会学術大会一般研究発表後抄録 (55) 388-388 1999

    Publisher: 日本放射線技術学会

  157. Development and Evaluation of Fluorescence Meter Using a Photodiode

    Sakamoto Hiroshi, Chida Kouichi, Kameya Motoki, Katakura Tsuyoshi, Ohishi Mikio, Ishikawa eiko, Usui Akihito, Nakada Mitsuru, Sasaki Masatoshi

    (54) 397-397 1998

    Publisher: 日本放射線技術学会

  158. Performance Comparison of Non-invasive X-ray Analyzers : 13th Report

    WATANABE S., CHIDA K., NAKADA M., OGURA T., SHIMA I., BANNO T., SASAKI M.

    (54) 400-400 1998

    Publisher: 日本放射線技術学会

  159. Operator Dose Estimation of Cardiac Catheterization in Transbrachial Approach

    Chida Koichi, Sai Masahiro, Ishiya Hiroki, Onuma Kyoko, Sakamoto Hiroshi, Sato Kunihiko, Fukuda Maki, Mitsui Shinya, Sasaki Masatoshi

    (54) 157-157 1998

    Publisher: 日本放射線技術学会

  160. Performance Comparison of Non-invasive X-ray Analyzers : 12th Report

    Nakada Mitsuru, Chida Kouichi, Watanabe Satoru, Satou Hiroyuki, Hosokai Yoshiyuki, Okada Kinya, Sasaki Masatoshi

    日本放射線技術学会総会学術大会一般研究発表後抄録 (54) 399-399 1998

    Publisher: 日本放射線技術学会

  161. 心機能血行動態データのシネ撮影技術への活用 (シネ撮影研究)

    千田浩一

    シネ撮影研究 14 78-87 1997/04

  162. Present condition of exposure dose and betterment for cardiac catheterization in Tohoku University Hospital

    T. Nagasaka, K. Chida, S. Sakamoto, S. Takahashi, M. Sasaki, M. Zuguchi

    Japanese Journal of Clinical Radiology 40 345-349 1995/01/01

    ISSN: 0009-9252

Show all ︎Show first 5

Books and Other Publications 4

  1. 放射線医療技術学叢書(25)

    日本放射線技術学会計測分科会, d, 千田浩一ほか

    日本放射線技術学会 2012/09

  2. 内部障害のリハビリテーション

    上月正博, 千田浩一ほか

    医歯薬出版 2009/05

  3. 診療放射線技師マスターテキスト 上巻

    梁川功ほか, 千田 浩一

    メジカルビュー社 2008/04

  4. 診療放射線技師マスターテキスト 下巻

    梁川 功ほか, 千田 浩一

    メジカルビュー社 2008/04

Presentations 150

  1. β線用プラスチックシンチレーションサーベイ メータにおけるγ線影響の検証―線源検出器間距離に基づいた比較

    山本啓介, 進藤僚太, 稲葉洋平, 鈴木正敏, 千葉浩生, 千田浩一

    第4回 東日本大震災・原子力災害学術集会 2026/03/20

  2. 携帯用小型GMサーベイメータの基礎的性能評価

    佐々木理桜, 本宮響太郎, 稲葉洋平, 千田浩一

    第4回 東日本大震災・原子力災害学術集会 2026/03/19

  3. 環境レベルに近づけた低濃度トリチウム水の持続曝露による細胞影響解析

    和泉哉汰, 礒部理央, 佐藤拓, Jiaxin Li, 本宮響太郎, 山下琢磨, 木野康志, 福本学, 笹谷めぐみ, 鈴木正敏, 千田浩一

    第27回「環境放射能」研究会 2026/03/11

  4. 航空機モニタリングデータを取り入れた野生ニホンザルの外部被ばく線量評価

    佐藤拓, Jiaxin Li, 和泉哉汰, 本宮響太郎, 山下琢磨, 木野康志, 高橋温, 篠田壽, 遠藤暁, 福本学, 鈴木正敏, 千田浩一

    第27回環境放射能研究 2026/03/12

  5. Analysis of Peak Skin Dose in Neuroendovascular Therapy of Unruptured Aneurysms

    Satoru Kawauchi, Koichi Chida, Yusuke Hamada, Takashi Moritake, Wataro Tsuruta

    European Congress of Radiology 2026/03/04

  6. Enhanced eye protection using lead glasses with a bottom-shield structure in interventional radiology procedures

    Ryota Shindo, Keisuke Yamamoto, Masaki Fujisawa, Kodai Sagehashi, Yohei Inaba, Koichi Chida

    European Congress of Radiology 2026/03/04

  7. Effects of Electromagnetic Waves on Measurements of Electronic Pocket Dosimeters

    Akisawa A., Sasaki E., Yonenaga H., Izumi K., Okabe Y., Inaba Y., Chida K.

    European Congress of Radiology 2026/03/04

  8. 末梢血管治療(EVT)術者の手指被ばく線量に関する初期検討

    加藤聖規, 芳賀喜裕, 曽田真宏, 守屋亮太朗, 笠原梓司, 齋藤和久, 鈴木新一, 荒井剛, 稲葉洋平, 千田浩一

    Japan Endovascular Treatment Conference(JET2026) 2026/02/07

  9. X線透視下での気管支鏡検査 における医師の水晶体被ばくの評価

    高平咲希, 芳賀喜裕, 曽田真宏, 阿部美津也, 加賀勇治, 木村雄一郎, 稲葉洋平, 千田浩一

    第24回日本放射線安全管理学会学術大会 2025/12/17

  10. 電子式個人積算線量計における電磁波影響の評価

    秋澤彩乃, 佐々木永仁, 米永裕敬, 和泉哉汰, 稲葉洋平, 千田浩一

    第24回日本放射線安全管理学会学術大会 2025/12/16

  11. Transcatheter aortic valve implantation : radiation dose received by patients and physicians

    Sota Masahiro, Chida K., Haga Y., Kato T., Kasahara S., Arai T., Ono S., Tada N.

    RSNA 2025 2025/11/30

  12. 新たな線量制御機構を備えた脳血管撮影装置の画質評価

    蜂谷 幸大, 安孫子大暉, 松田善和, 千田浩一

    日本脳神経血管内治療学会学術集会 2025/11/12

  13. 脳血管内治療における診療放射線技師の役割と工夫:脳血管内治療における皮膚線量分布の解析

    川内 覚, 千田 浩一, 濱田 祐介, 依田 彰吾, 佐藤 裕太, 鶴田 和太郎, 石神 大一郎, 宮本 智志, 大友 優太

    第42回 日本脳神経血管内治療学会 2025/11/15

  14. 航空機モニタリングデータを用いた福島第一原発事故被災野生ニホンザルの外部被ばく評価と体内酸化状態の解析

    佐藤拓, 遠藤暁, Jiaxin Li, 和泉哉汰, 本宮響太郎, 山下琢磨, 木野康志, 鈴木正敏, 福本学, 千田浩一

    第10 回福島原発事故による周辺生物への影響に関する勉強会 2025/11/08

  15. Optimization of the methods for assessing the effects of long-term low dose-rate radiation on animals inhabiting the affected area of nuclear disasters

    Taku Sato, Jiaxin Li, Ryoya Ishikawa, Kanata Izumi, Kyotaro Motomiya, Satoru Endo, Takuma Yamashita, Yasushi Kino, Manabu Fukumoto, Masatoshi Suzuki, Koichi Chida

    2025/10/25

  16. The pathway that ionizing radiation induces tetraploid cells in G1 phase.

    Kyotaro Motomiya, Kanata Izumi, Taku Sato, Jiaxin Li, Manabu Fukumoto, Masatoshi Suzuki, Koichi Chida

    The 68th Annual Meeting of the Japanese Radiation Research Society / The 6th Asian Congress of Radiation Research (JRRS2025/ACRR2025)合同大会 2025/10/25

  17. Dynamics of co-localized foci of phosphorylated H2AX and 53BP1 induced by ionizing radiation

    Kanata Izumi, Taku Sato, Kyotaro Motomiya, Jiaxin Li, Manabu Fukumoto, Megumi Sasatani, Masatoshi Suzuki, Koichi Chida

    The 68th Annual Meeting of the Japanese Radiation Research Society / The 6th Asian Congress of Radiation Research (JRRS2025/ACRR2025) 2025/10/25

  18. 小型線量率サーべイメータの機器間における個体差(測定感度差)の評価

    星 幸音, 木村 大朗, 小澤 歩波, 仙木 志依, 吉田 葵, 本宮 響太郎, 阿部 善弘, 千田 浩一

    第53回日本放射線技術学会秋季 学術大会 2025/10/19

  19. 指定箇所検査用汚染モニタの頭部および顔面用パネルにおける汚染部位の違いの影響とその改善に向けた検討

    吉田葵, 小澤歩波, 木村朗大, 仙木志依, 星幸音, 中村美緖, 阿部喜弘, 越智隆浩, 千田浩一

    第53回日本放射線技術学会秋季 学術大会 2025/10/18

  20. ATM機能抑制と放射線被ばく後の正常細胞の運命

    本宮響太郎, 和泉哉汰, 佐藤拓, Jiaxin Li, 福本学, 鈴木正敏, 千田浩一

    第53回日本放射線技術学会秋季 学術大会 2025/10/18

  21. "プラスチックシンチレーションサーベイメータ におけるγ線影響の評価―線源検出器間距離を変えての検討"

    山本啓介, 進藤僚太, 稲葉洋平, 鈴木正敏, 千葉浩生, 千田浩一

    第53回日本放射線技術学会秋季 学術大会 2025/10/18

  22. 改良型X線防護壁付ドレープによる心臓IVR術者の手指被ばく低減に関する基礎的検討

    佐々木永仁, 秋澤彩乃, 米永裕敬, 藤沢昌輝, 芳賀喜裕, 曽田真宏, 加藤聖規, 阿部美津也, 加賀勇治, 稲葉洋平, 千田浩一

    第53回日本放射線技術学会秋季 学術大会 2025/10/19

  23. 血管内治療 (endovascular therapy)における医師の水晶体線量の評価

    今田佳奈英, 千田浩一, 芳賀喜裕, 下橋航大

    第53回日本放射線技術学会秋季学術大 会 2025/10/17

  24. DRLs2030に向けた経カテーテル的大動脈弁留置術の線量管理への提言

    加藤聖規, 芳賀喜裕, 曽田真宏, 守屋亮太朗, 笠原梓司, 齋藤和久, 鈴木新一, 荒井剛, 稲葉洋平, 千田浩一

    第53回日本放射線技術学会秋季学術大会 2025/10/17

  25. 放射線被ばく後のDNA二重鎖切断マーカーの性状変化

    和泉哉汰, 佐藤拓, 本宮響太郎, Jiaxin Li, 稲葉洋平, 福本学, 鈴木正敏, 千田浩一

    第53回日本放射線技術学会秋季学術大会 2025/10/18

  26. 電子式個人積算線量計の角度依存性に対する線量計―線源間距離の影響評価

    秋澤彩乃, 佐々木永仁, 米永裕敬, 和泉哉汰, 岡部優輝, 稲葉洋平, 千田浩一

    第53回日本放射線技術学会秋季学術大会 2025/10/19

  27. パンケーキ型GM計数管における装置間感度特性の比較検討

    角田 和也, 大葉 隆, 千田 浩一

    第53回日本放射線技術学会秋季学術大会 2025/10/19

  28. 携帯用小型GMサーベイメータと従来型GMサーベイメータの応答性比較に関する検討

    佐々木理桜, 本宮響太郎, 山本啓介, 稲葉洋平, 千田浩一

    第53回日本放射線技術学会秋季 学術大会 2025/10/19

  29. 新型携帯用γ線スペクトルサーベイメータにおける核種同定機能の評価

    仙木志依, 小澤歩波, 木村朗大, 星幸音, 吉田葵, 佐々木理桜, 石井浩生, 稲葉洋平, 千田浩一

    第15回 東北放射線医療技術学術大会 2025/10/12

  30. 小型線量率サーベイメータのエネルギー推定モードに関する基礎的検討

    小澤歩波, 木村朗大, 仙木志依, 星幸音, 吉田葵, 佐々木理桜, 阿部喜弘, 越智隆浩, 石井浩生, 稲葉洋平, 千田浩一

    第15回 東北放射線医療技術学術大会 2025/10/12

  31. GM管式小型サーベイメータの検出感度差の複数台比較

    本宮響太郎, 佐々木理桜, 山本啓介, 阿部喜弘, 越智隆浩, 稲葉洋平, 鈴木正敏, 千田浩一

    第15回 東北放射線医療技術学術大会 2025/10/12

  32. パノラマX線撮影における診断参考レベル活用に向けた線量-幅積測定法の基礎検討

    石井浩生, 稲葉洋平, 千田浩一, 小野寺崇, 茅野伸吾, 斎政博

    第15回 東北放射線医療技術学術大会 2025/10/12

  33. β線計測器の校正用面線源を用いた携帯用小型GMサーベイメータに関する基本性能に関する検討

    佐々木理桜, 本宮響太郎, 山本啓介, 稲葉洋平, 千田浩一

    第15回 東北放射線医療技術学術大会 2025/10/12

  34. 球形状小型 Si半導体素子を用 いた新たなリアルタイム線量測定システムにおける CT 画像への影響と放射線耐性についての基礎検討

    藤沢 昌輝, 松本 卓己, 進藤 僚太, 松本 真之介, 加田 渉, 千田 浩一, 稲葉 洋平

    第15回 東北放射線医療技術学術大会 2025/10/12

  35. 顔面側面・後頭部での放射能汚染における指定箇所検査用汚染モニタの検出評価

    木村朗大, 小澤歩波, 仙木志依, 星幸音, 吉田葵, 中村美緖, 阿部喜弘, 越智隆浩, 千田浩一

    第15回 東北放射線医療技術学術大会 2025/10/12

  36. 低濃度トリチウム水の持続暴露とDNA二重鎖切断誘発の検討

    和泉哉汰, 佐藤拓, 本宮響太郎, Jiaxin Li, 山下琢磨, 木野康志, 福本学, 鈴木正敏, 千田浩一

    第10回福島原発事故による周辺生物への影響に関する勉強会 2025/09/07

  37. 細胞系譜解析による放射線誘発老化様増殖停止とマイトティックカタストロフィの交点

    本宮響太郎, 和泉哉汰, 佐藤拓, Jiaxin Li, 福本学, 鈴木正敏, 千田浩一

    第5回若手放射線影響研究会 2025/08/22

  38. 放射線誘発DNA二重鎖切断フォーカスの質的解析

    和泉哉汰, 佐藤拓, 本宮響太郎, Jiaxin Li, 山下琢磨, 木野康志, 福本学, 笹谷めぐみ, 鈴木正敏, 千田浩一

    第5回若手放射線影響研究会 2025/08/22

  39. 福島第一原発事故に被災した野生ニホンザルの外部被ばく評価法の構築と血漿および肝臓の酸化ストレス状 態解析

    佐藤拓, Jiaxin Li, 石川諒椰, 和泉哉汰, 本宮響太郎, 遠藤暁, 山下琢磨, 木野康志, 福本学, 鈴木正敏, 千田浩一

    第5回若⼿放射線影響研究会 2025/08/22

  40. 職域健診における乳がん検診受診者の意識調査と受診率向上へ向けた取り組み~Webアンケート調査より~.

    根本まなみ, 稲葉洋平, 奥平直人, 千田浩一

    第66回日本人間ドック・予防医療学術大会 2025/08/22

  41. 頭頸部用放射線防護具の鉛当量の違いによる防 護効果について

    日野隆喜, 日野隆喜, 山崎智香, 佐藤俊光, 鈴木幸司, 千田浩一

    第61回山形県放射線技師会学術大会 2025/05/31

  42. 脳動脈瘤塞栓術における患者被ばく線量増大に関わる因子の検討

    川内 覚, 千田 浩一, 濵田 祐介, 依田 彰吾, 澤山 慧, 落合 祐友, 神 芳行, 鶴田 和太郎

    日本放射線技術学会 第81回 総会学術大会 2025/04/13

  43. Evaluating the performance of a photoluminescence glass dosimeter at diagnostic x-ray energies for interventional radiology International-presentation

    K. Chida, M. Kato, Y. Inaba, T. Moritake

    European Congress of Radiology (ECR2014) 2014/03/05

  44. 蛍光ガラス線量計を用いた経皮的冠動脈インターベンション時の患者被曝線量実測に基づいた間接的患者被曝線量推定法

    加藤 守, 千田 浩一, 松本 和則, 吉田 恭平, 佐々木 文昭, 佐々木 正文, 大阪 肇, 土佐 鉃雄

    第35回日本心血管インターベンション治療学会東北地方会 2014/02/15

  45. 放射線災害時被曝スクリーニング法開発に向けての基礎的検討

    稲葉洋平, 千田浩一, 孫略, 伊藤一也, 盛武敬, 平山暁

    九州放射線フリーラジカル意見交換会 2014/02/08

  46. 東北大学災害科学国際研究所災害放射線医学分野における研究の現状等について

    千田浩一

    九州放射線フリーラジカル意見交換会 2014/02/08

  47. 放射線暴露後血液のラジカル消去活性の測定

    稲葉洋平, 千田浩一, 孫略, 伊藤一也, 盛武敬, 平山暁

    日本酸化ストレス学会関東支部会 2013/12/15

  48. 当院カテ室における被曝低減の取り組み

    森島貴顕, 片柳敬一, 片平美明, 千田浩一, 千葉浩生

    第4回SENDAI/NEW TOKYO ライブ 2013/11/29

  49. 放射性物質の飛散によりComputed Radiography(CR)画像に写し出されたblack spotsの低減法の基礎的検討

    樫村康弘, 折笠秀樹, 草野義直, 今野広一, 千田浩一

    日本放射線安全管理学会第12回学術大会 2013/11/27

  50. X線診断領域における新型個人線量計システムの基礎検討

    稲葉洋平, 千田浩一, 小林亮太, 加賀勇治, 芳賀喜裕, 梁川功

    日本放射線安全管理学会第12回学術大会 2013/11/26

  51. 医療従事者用リアルタイム被曝測定システムの有用性‐ 第1報(測定系固有特性)

    稲葉洋平, 千田浩一, 小林亮太, 加賀勇治, 芳賀喜裕, 梁川功

    第3回東北放射線医療技術学術大会 2013/11/02

  52. 血管撮影装置の総濾過の変化がガラス線量計に与える影響

    加藤 守, 千田 浩一, 松本 和則, 吉田 恭平, 佐々木 文昭, 佐々木 正文, 大阪 肇, 土佐 鉃雄

    第3回東北放射線医療技術学術大会 2013/11/02

  53. 嚥下造影検査(VF)時における被験者および従事者被ばく線量の推定

    森島貴顕, 渡辺裕志, 目黒祐子, 千田浩一, 千葉浩生

    第3回東北放射線医療技術学術大会 2013/11/02

  54. 医療従事者用リアルタイム被曝測定システムの有用性 第2報(性能比較)

    長島慎弥, 中村昌隆, 砂村あゆみ, 曽田真宏, 稲葉洋平, 千田浩一

    第3回東北放射線医療技術学術大会 2013/11/02

  55. X線診断領域における新型リアルタイム個人線量計の基礎的性能評価

    稲葉洋平, 千田浩一, 小林亮太, 加賀勇治, 芳賀喜裕, 梁川功

    第41回日本放射線技術学会秋季学術大会 2013/10/17

  56. 心臓インターベンション時の皮膚入射線量実測による多施設線量評価

    加藤 守, 千田 浩一, 盛武 敬, 小口 靖弘, 加賀 勇治, 坂本 肇, 塚本 篤子, 川内 覚

    第41回日本放射線技術学会秋季学術大会 2013/10/17

  57. 空間線量測定用新型サーベイメータの性能評価

    森島貴顕, 千葉昌弘, 片平美明, 千田浩一, 千葉浩生

    第41回日本放射線技術学会秋季学術大会 2013/10/17

  58. 一般撮影におけるRISでの被曝線量の管理

    田野政勝, 吉原千治, 森内啓三郎, 雨宮正太, 金澤宏, 渋谷清和, 千田浩一

    第41回日本放射線技術学会秋季学術大会 2013/10/17

  59. 検診機関職員を対象とした放射線に関するアンケート調査

    八島幸子, 沼倉二郎, 千田浩一

    第41回日本放射線技術学会秋季学術大会 2013/10/17

  60. リアルタイム型ポケット線量計の性能比較

    中村昌隆, 砂村あゆみ, 曽田真宏, 長島慎弥, 加賀勇治, 稲葉洋平, 千田浩一

    第41回日本放射線技術学会秋季学術大会 2013/10/17

  61. 嚥下造影検査(VF)時における従事者被ばく線量推定

    森島貴顕, 渡辺裕志, 目黒祐子, 千田浩一, 千葉浩生

    第19回 日本摂食・嚥下リハビリテーション学会学術大会 2013/09/22

  62. PCI時における最大皮膚線量算出に関する検討

    加藤守, 千田 浩一, 佐藤匡也, 寺田茂則, 吉田恭平, 佐々木文昭, 大阪肇

    第22回日本心血管インターベンション治療学会学術集会(CVIT2013) 2013/07/11

  63. 未成年者の心臓IVRにおける蛍光ガラス線量計を用いた患者被曝線量測定法

    加藤 守, 千田 浩一, 盛武 敬, 小口 靖弘, 佐々木 正文, 大阪 肇, 土佐

    第69回日本放射線技術学会総会学術大会 2013/04/11

  64. FPD搭載IVR装置における機器管理ソフトウエアの開発と新しい日常点検プロトコルの提案

    芳賀喜裕, 片岡望, 熊坂江里子, 荒井剛, 鈴木新一, 加賀勇治, 千田浩一

    第69回日本放射線技術学会総会学術大会 2013/04/11

  65. Study on accurate dose mapping system with radiophotoluminescence glass dosimeter (RPLD) measuring the direct patient entrance dose in cardiac interventional procedures International-presentation

    Mamoru Kato, Koichi Chida, Takashi Moritake, Yasuhiro Koguchi, Tadaya Sato, Hajime Oosaka, Tetsuo Tosa, Ken Kadowaki

    European Congress of Radiology (ECR2013) 2013/03/06

  66. Radiation dose to the interventional radiology staff, especially nurses International-presentation

    K. Chida, Y. Haga, Y. Kaga, N. Kataoka, E. Kumasaka, T. Meguro, M. Zuguchi

    European Congress of Radiology (ECR2013) 2013/03/06

  67. Black spots on Computed Radiography Images Caused by Radioactive Material Discharged in the Fukushima Nuclear Power Plant Accident International-presentation

    Yasuhiro Kashimura, Hideki Orikasa, Yoshinao Kusao, Koichi Konno, Koichi Chida

    RSNA 2012 2012/11/25

  68. Quality Control in Fluoroscopy Systems with an Over-the-Table X-ray Tube International-presentation

    Ohta J, Katou H, Masuda T, Chida K

    RSNA 2012 2012/11/25

  69. Knowledge of the Public Regarding Ionizing Radiation and Radioactive Material in Japan International-presentation

    Yashima S, Chida K, Ohta Y, Numakura J, Shibuya D, Hisamichi S

    RSNA 2012 2012/11/25

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    Certificate of Merit受賞

  70. 福島第1原発事故に伴い発生したComputed Radiography (CR)画像のblack spotsの発生割合と低減法の基礎的検討

    樫村康弘, 佐藤尚司, 桑村啓太, 実川剛, 折笠秀樹, 伊藤幹, 草野義直, 赤沼輝亨, 今野広一, 千田浩一

    第2回東北放射線医療技術学術大会 2012/11/03

  71. FPD用QCファントムにおける品質管理プロトコルの検討と品質管理ソフトの開発

    芳賀喜裕, 佐藤直人, 片岡望, 熊坂江里子, 加賀勇治, 千田浩一

    第2回東北放射線医療技術学術大会 2012/11/03

  72. 2機種の多機能型X線出力アナライザの基礎的性能評価

    杣 薫織, 工藤貴弘, 星野有紀, 加藤雅人, 芳賀喜裕, 加賀勇治, 千田浩一

    第2回東北放射線医療技術学術大会 2012/11/03

  73. 看護師・看護学生の放射線に関する意識調査からみた放射線教育の重要性

    森島貴顕, 繁泉和彦, 瀬戸初江, 片平美明, 千田浩一, 千葉浩生

    CCT2012 2012/11/02

  74. Computed Radiography(CR)画像に写し出されたblack spotsの発生原因とその対処法の検討

    樫村康弘, 桑村啓太, 実川剛, 高橋誠, 名城敦, 折笠秀樹, 伊藤幹, 草野義直, 赤沼輝亨, 今野広一, 千田浩一

    第40回日本放射線技術学会秋季学術大会 2012/10/04

  75. FPD 用 QC ファントムにおける試作品質管理ソフトの作成

    賀喜裕, 荒井剛, 鈴木新一, 片岡望, 熊坂江里子, 加賀勇治, 千田浩一

    第40回日本放射線技術学会秋季学術大会 2012/10/04

  76. 多機能型の非接続型X線測定器を用いた線量測定に関する基礎的検討

    加藤雅人, 工藤貴弘, 杣薫織, 星野有紀, 加賀勇治, 千田浩一

    第40回日本放射線技術学会秋季学術大会 2012/10/04

  77. 心血管IVRにおける放射線障害について

    森島貴顕, 片柳敬一, 片平美明, 千田浩一, 千葉浩生

    第10回仙台PTCAネットワークライブ 2012/09/29

  78. 嚥下造影検査(VF)時における被験者および従事者被ばく線量の基礎的検討

    森島貴顕, 渡辺裕志, 目黒祐子, 千田浩一, 千葉浩生

    第17回・第18回共催 日本摂食・嚥下リハビリテーション学会学術大会 2012/09/01

  79. 被曝低減は本当に必要? ― 臨床の立場から ―

    加藤 守, 千田 浩一, 佐藤 匡也, 寺田 茂則, 吉田 恭平, 佐々木 文昭, 大阪 肇, 土佐 鉄雄

    第21回日本心血管インターベンション治療学会学術集会(CVIT2012) 2012/07/11

  80. FPD搭載型心血管撮影装置における同一QCファントムを用いた線量と画質の多施設評価

    加藤 守, 千田 浩一, 土佐 鉄雄, 伊丸岡 俊治, 坂本 幸夫, 武蔵 安徳, 中田 充, 芳賀 喜裕, 森島 貴顕, 山田 金市, 知々田 勝之

    第10回アジア太平洋IVR学会(APCCVIR2012) 2012/05/11

  81. Imaging plateに写し出されHot spotsの基礎的検討

    樫村康弘, 桑村啓太, 実川剛, 折笠秀樹, 名城敦, 伊藤幹, 草野義直, 今野広一, 八島幸子, 千田浩一

    第103回日本医学物理学会 2012/04/12

  82. 蛍光ガラス線量計を用いた心臓インターベンション時の患者入射皮膚線量測定の検討

    加藤 守, 千田 浩一, 盛武 敬, 小口 靖弘, 大阪 肇, 土佐 鉄雄

    第68回日本放射線技術学会総会学術大会 2012/04/11

  83. X線TV装置日常点検ファントム使用時のファントムセッティング方法が及ぼす影響の検討

    太田丞二, 黒木克寿, 佐藤孝行, 小浦基明, 千田浩一

    第68回日本放射線技術学会総会学術大会 2012/04/11

  84. 災害被ばく時における電話被ばく相談の基礎的検討

    八島幸子, 太田洋一, 千田浩一

    第68回日本放射線技術学会総会学術大会 2012/04/11

  85. Radiation Safety Issues for IVR Physicians International-presentation

    Chida k

    RSNA 2009 2009/11/29

  86. Radiation Exposure in Cardiac Catheterization for Children International-presentation

    Chida K

    RSNA 2009 2009/11/29

  87. Patient Skin Injury in Cardiac Intervention Procedures International-presentation

    Kato M, Chida K

    RSNA 2009 2009/11/29

  88. Is The MOSFET Dosimeter Feasible at Diagnostic X-Ray Energies for Interventional Radiology? International-presentation

    Chida K

    MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING WORLD CONGRESS 2009 2009/09/07

  89. Does a flat-panel detector reduce the skin radiation dose in interventional procedures? International-presentation

    Chida K

    European Congress of Radiology (ECR 2009) 2009/03/06

  90. Does a flat-panel detector reduce the skin radiation dose in interventional procedures? International-presentation

    Chida K, Inaba Y, Kato M, Saito H, Ishibashi T, Maruoka S, Zuguchi M

    European Congress of Radiology (ECR 2009) 2009/03/03

  91. Aortic wall stress pattern in the patients with thoracic aortic aneurysm: An analysis with finite element models of aortas. International-presentation

    Saito H, Hosokai Y, Chida K

    Radiological Society of North America (94th RSNA) 2008/11/30

  92. Optimizing the Patient Radiation Dose in IVR. International-presentation

    Chida K

    Radiological Society of North America (94th RSNA) 2008/11/30

  93. Radiation protection basics for IVR staff: Usefulness of non-lead aprons. International-presentation

    chida K

    Radiological Society of North America (94th RSNA). 2008/11/30

  94. 心臓血管IVR用X線装置の散乱X線量の多施設比較

    結城裕子, 千田浩一 ほか

    第36回日本放射線技術学会秋季学術大会 2008/10/23

  95. How to evaluate patient radiation dose in fluoroscopically guided cardiac intervention procedures International-presentation

    Chida K

    Cardiovascular and Interventional Radiological Society of Europe (CIRSE 2008) 2008/09/13

  96. Stability of radiation survey meters and electronic pocket dosimeters International-presentation

    Chida k

    International Congress of Radiology ICR 2008 2008/06/04

  97. 血管撮影装置の表示線量を活用しよう(心血管IVRにおいて):患者総線量と最大線量との関係

    千田浩一

    第65回日本放射線技術学会総会学術大会 2008/04/11

  98. 心血管造影装置における入射表面線量多施設評価ー7年間での比較ー

    稲葉洋平, 千田浩一ほか

    第65回日本放射線技術学会総会学術大会 2008/04/11

  99. Can lowering the maximum compression force in mammography reduce pain and still provide acceptable results? International-presentation

    Chida K

    ECR2008 2008/03/07

  100. What is the most effective indicator for estimating the maximum radiation dose to the patient during percutaneous coronary intervention procedures? International-presentation

    Chida K

    ECR2008 2008/03/07

  101. Effective dose equivalent to estimated physician dose in cardiac intervention procedures: How best to evaluate it? International-presentation

    Chida K

    93rd RSNA 2007/11/25

  102. Understanding the details of the patient radiation dose during cardiac intervention procedures: Ways to Avoid Radiation Injuries International-presentation

    Chida K

    93rd RSNA 2007/11/25

  103. What Is the Most Useful Method for Evaluating the Maximum Radiation Dose to the Patient during Cardiac IVR? International-presentation

    Chida K

    93rd RSNA 2007/11/25

  104. Usefulness of stress perfusion MRI with continuous adenosine injection in cardiac patients International-presentation

    Nagasaka T, Chida K

    93rd RSNA 2007/11/25

  105. ワイドダイナミックタイプ新型蛍光量計の性能評価

    白鳥和敏, 千田浩一ほか

    日本放射線技術学会35回秋季大会 2007/10/25

  106. DOES THE LOCATION AND AREA OF MAXIMUM PATIENT SKIN DOSE DURING PCI RELATE TO THE TARGET VESSEL? International-presentation

    Chida K

    30th The Society for Cardiovascular Angiography and Interventions 2007/05/09

  107. 心血管IVRにおける患者および術者の被曝低減法

    千田浩一

    日本医学放射線学会 2007/04/13

  108. 血管造影IVR術者の実効線量評価法に関する基礎的検討

    舛山葉菜子, 千田浩一

    日本放射線技術学会 2007/04/13

  109. MOSFET型線量計を用いた患者皮膚線量測定に関する基礎的検討

    稲葉 洋平, 千田 浩一

    日本放射線技術学会 2007/04/13

  110. 心血管IVRにおける患者被曝線量:最大皮膚線量部位に関する検討(第4報)

    布田 憲司, 千田 浩一

    日本放射線技術学会 2007/04/13

  111. Is the B-type natriuretic peptide correlated with the myocardial PCr/ATP ratio determined by rapid 31P-MRS in DCM patients? International-presentation

    Koichi Chida

    10th Society of Cardiovascular Magnetic Resonance (SMCR) 2007/02/01

  112. 心血管IVR時の放射線防護

    千田浩一

    第21回日本心血管インターベンション学会東北地方会 2007/01/27

  113. Does the Performance of Various Digital Mammography International-presentation

    Asuka Nakagami, Masahiro Sai, Koichi Chida

    RSNA 2006/11/26

  114. カテーテルアブレーションにおける患者最大皮膚線量部位に関する基礎的検討

    布田 憲司ほか

    第34回日本放射線技術学会秋季大会 2006/10/19

  115. IVR基準点線量の基礎的検討-2装置間の比較-

    森島 貴顕 ほか

    第34回日本放射線技術学会秋季大会 2006/10/19

  116. I..I.-被写体間密着方法の違いによる術者被曝線量の比較.

    小野寺, 理紗 ほか

    第34回日本放射線技術学会秋季大会 2006/10/19

  117. 被曝線量の測定評価法

    千田浩一

    全国循環器撮影研究会 2006/09/23

  118. Development of a quantitative isometric exercise device for MR examination. International-presentation

    K Chida, H Saito, T Nagasaka, M Zuguchi, Y Takai, M Kohzuki, S Takahashi, S Yamada

    24th INTERNATIONAL CONGRESS OF RADIOLOGY (ICR2006) 2006/09/12

  119. マンモグラフィにおける圧迫圧の基礎的検討

    小松由佳, ほか

    第14回日本がん検診・診断学会 2006/07/21

  120. 低パルスレートのパルス透視により被曝は低減できるか?

    齋藤春夫, ほか

    第35回日本血管造影IVR学会 2006/05/18

  121. 心血管IVRにおける被曝線量計測評価に関する諸問題

    千田浩一

    第62回日本放射線技術学会 2006/04/07

  122. 心血管IVRにおいてパルス透視は患者被曝低減に役立つか?

    千田浩一

    第65回日本医学放射線学会 2006/04/07

  123. 診断X線領域におけるDirect Ion Storage型ポケット線量計の基本性能評価

    小島康弘, ほか

    第62回日本放射線技術学会総会学術大会 2006/04/07

  124. 心血管IVRにおける患者被曝線量:最大皮膚線量部位に関する検討(第2報)

    布田憲司, ほか

    第62回日本放射線技術学会総会学術大会 2006/04/07

  125. Does Pulsed Fluoroscopy Reduce Patients’ Skin Dose as compared to Conventional Fluoroscopy? International-presentation

    Koichi Chida

    91st Radiological Society of North America (RSNA2005) 2005/11/27

  126. 心血管IVRにおける患者被曝線量:最大皮膚線量部位に関する検討

    布田憲司, ほか

    第33回日本放射線技術学会秋季学術大会 2005/10/20

  127. I.I〜被写体間距離およびFIDの違いによる患者皮膚入射線量低減効果の違い

    小野寺理紗, ほか

    第33回日本放射線技術学会秋季学術大会 2005/10/20

  128. The effectiveness of additional lead shielding in protecting the physician from radiation: A phantom study International-presentation

    Koichi Chida

    14th International Conference of Medical Physics (ICMP2005) 2005/09/12

  129. Estimating the maximum radiation skin dose during cardiac interventional procedures using the dose-area product, fluoroscopic time, and patient weight International-presentation

    Koichi Chida

    27th European Society of Cardiology Congress (ESC205) 2005/09/03

  130. 心臓カテーテル検査室における放射線被曝防護の取り組み

    森島貴顕, ほか

    第14回日本心血管インターベンション学会 2005/06/10

  131. 心血管インターベンションにおける患者皮膚最大線量と透視時間、面積線量、患者BMIの関係

    千田浩一

    第64回日本医学放射線学会 2005/04/08

  132. 新型リアルタイム患者皮膚被曝線量計の性能評価

    森島貴顕, ほか

    第61回日本放射線技術学会総会学術大会 2005/04/08

  133. 放射線管理用測定器の測定精度比較(第1報)

    西村裕子, ほか

    第61回日本放射線技術学会総会学術大会 2005/04/08

  134. 放射線管理用測定器の測定精度比較(第2報)

    佐藤友子, ほか

    第61回日本放射線技術学会総会学術大会 2005/04/08

  135. Estimating the maximum radiation skin dose during percutaneous coronary intervention using the fluoroscopic time, dose-area product, and body mass index. International-presentation

    Koichi Chida

    17th European Congress of Radiology (ECR2005) 2005/03/04

  136. Feasibility of rapid-sequence 31P-MRS of the heart in cardiac patients International-presentation

    Koichi Chida

    17th European Congress of Radiology (ECR2005) 2005/03/04

  137. パルス透視の被曝線量に関する実験的検討

    布田憲司, ほか

    第32回日本放射線技術学会秋季学術大会 2004/10/21

  138. Estimating the maximum radiation skin dose during cardiac radiofrequency catheter ablation using the dose-area product, fluoroscopic time, and body weight. International-presentation

    Koichi Chida

    23rd INTERNATIONAL CONGRESS OF RADIOLOGY (ICR2004) . 2004/06/25

  139. Radiation exposure of patients with various x-ray systems used in cardiac interventional procedures: phantom study. International-presentation

    Koichi Chida

    23rd INTERNATIONAL CONGRESS OF RADIOLOGY (ICR2004) 2004/06/25

  140. 心臓カテーテル検査における術者被曝防護?追加シールド(鉛防護具)の有効性?

    森島貴顕, ほか

    第60回日本放射線技術学会総会学術大会 2004/04/09

  141. デジタルシネ心血管撮影装置によって皮膚被曝は低減したか?

    齋藤春夫, ほか

    第63回日本医学放射線学会学術集会 2004/04/09

  142. 心臓カテーテル検査室の放射線被曝防護の現状と取り組み

    森島貴顕, ほか

    日本心血管インターベンション学会第15回東北地方会 2004/01/31

  143. Quality control of the x-ray tube voltage waveforms of high-frequency generators: a study of FFT analysis International-presentation

    Koichi Chida

    89th Radiological Society of North America (RSNA2003) 2003/11/30

  144. Relationship between patient weight, fluoroscopic time, dose-area product, and maximum radiation skin dose in cardiac interventional procedures International-presentation

    Koichi Chida

    89th Radiological Society of North America (RSNA2003) 2003/11/30

  145. Optimization of tube potential/filter combinations for film-screen mammography: a contrast detail phantom study International-presentation

    Koichi Chida

    89th Radiological Society of North America (RSNA2003) 2003/11/30

  146. 心筋31P-MRSの臨床応用に向けた基礎的検討(第2報)

    永坂竜男, ほか

    第31回日本放射線技術学会秋季学術大会 2003/10/10

  147. 心筋のリンMRS短時間測定法の基礎的検討.

    千田浩一

    第56回心臓血管放射線研究会 2003/01/18

  148. Feasibility of Rapid-Sequence 31P-MRS of the Human Heart Using a 1.5-Tesla Clinical Imager International-presentation

    Koichi Chida

    88th Radiological Society of North America (RSNA2002) 2002/12/01

  149. Stability of Electron-Beam Energy Monitor International-presentation

    Koichi Chida

    87th Radiological Society of North America (RSNA2001). 2001/11/24

  150. Digital cine ventriculography using ECG-gated multiple diastolic injections in pediatric cardiac catheterization International-presentation

    Koichi Chida

    European Congress of Radiology (ECR 2000) 2000/03/05

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Industrial Property Rights 9

  1. X線診断装置、画像処理装置、及び画像診断支援方法

    大石 悟, 千田 浩一

    特許第6758951号

    Property Type: Patent

  2. 電源システム及び医用X線システム

    千田 浩一, 小林 亮太, 稲葉 洋平, 佐藤 公悦, 伊与木 勉

    特許第6488455号

    Property Type: Patent

  3. 線量計

    千田 浩一, 洞口 正之, 中村 正明, 佐藤 公悦, 伊与木 勉, 内嶋 栄一

    特許第6273475号

    Property Type: Patent

  4. 評価用補助具および評価用装置

    千田浩一ほか

    特許第5859232号

    Property Type: Patent

  5. 評価用補助具

    千田浩一

    特許第5826469号

    Property Type: Patent

  6. 放射線検出装置及び線量計

    佐藤 公悦, 松田 安司, 桑本 佳行, 伊与木 勉, 内嶋 栄一, 千田 浩一

    Property Type: Patent

  7. 放射線被ばくの判定方法

    孫 略, 盛武 敬, 平山 暁, 千田 浩一

    Property Type: Patent

  8. 温度測定プローブ及び温度測定システム

    千田 浩一, 永坂 竜男, 加藤 勝彦

    Property Type: Patent

  9. 放射線防護具

    千田浩一

    Property Type: Patent

Show all Show first 5

Research Projects 29

  1. リンMRS等による心筋エネルギー代謝状態の評価 Competitive

    1999/04 - Present

  2. 放射線被曝計測評価と放射線防護 Competitive

    1991/04 - Present

  3. 医用放射線機器のQC・QAおよび最適化 Competitive

    1990/04 - Present

  4. 放射線白内障の線量応答を解明し医師らの放射線防護を文化として定着させる

    盛武 敬, 黒坂 大次郎, 千田 浩一, 喜多村 紘子, 掛田 伸吾, 雑賀 司珠也, 栗山 知子, 吉永 信治, 初坂 奈津子, 佐々木 洋, 永田 竜朗, 古渡 意彦, 山下 一太, 土方 保和, 中上 晃一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 国立研究開発法人量子科学技術研究開発機構

    2024/04/01 - 2029/03/31

  5. 低線量・低線量率放射線長期被ばく影響に抗酸化能の抑制が関与するのか?

    鈴木 正敏, 千田 浩一, 遠藤 暁

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2024/04/01 - 2028/03/31

  6. 妊娠子宮を備えた被曝線量評価用ファントムの開発

    松永 雄太, 千田 浩一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2024/04/01 - 2027/03/31

  7. 新規解析モデルを活用する正常水晶体細胞の低線量域放射線への応答とp53関与の解析

    千田 浩一, 山本 直樹, 鈴木 正敏

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2023/04/01 - 2027/03/31

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    水晶体の職業被ばくが生じるインターベンショナル・ラジオロジー(IVR)に従事する医療スタッフの水晶体被ばく線量に関するデータをある程度収集することができた。 野生ニホンザルから採取した水晶体中の酸化ストレス解析方法の改良に取り組んだ。本解析では試料中のマロンジアルデヒド(MDA)とチオバルビツール酸の付加体を形成させて波長480から700 nmまでの範囲を1nmずつ吸光度を測定して得られるスペクトルを解析した。535 nm付近でのみ示される吸収のピークとその他の波長範囲の水平なベースラインの2成分が得られるので、535nmのピーク高から検量線を用いてMDA濃度が定量できる。しかしながら、組織試料解析では、ベースライン部分に起伏が生じて平坦なベースラインが得られないため、535nmのピーク高を正確に取得できずにMDAを評価できない課題が生じた。試料調整前に血液を取り除くことで解析可能なスペクトルが得られるようになった。また、血液除去過程が不十分であるとMDA濃度の正確性に影響を及ぼすことも分かった。本年度は組織試料を用いてMDA濃度を解析するためのプロトコールを確立し、従来法では定量が困難であった個体試料の評価できるようになったこと、従来よりも誤差範囲を小さくできるために低線量率被ばくによるわずかな変化を評価できる解析手法を確立した。 p53が機能するヒト水晶体上皮細胞の樹立するために、白内障手術時に切除される前のう片に接着しているヒト水晶体上皮細胞の初代培養を行った。研究分担者が開発した不死化ベクターは、従来の不死化ベクターと異なり遺伝子の特異的な領域に不死化遺伝子を選択的に導入することが可能であるため、水晶体上皮細胞の特徴が保持された不死化ヒト水晶体上皮細胞株(iHLEC-NY1)を作製することに成功した。

  8. 臨床用高性能CTによる心臓リハ患者の低侵襲心機能解析評価法の開発

    曽田 真宏, 千田 浩一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2023/04/01 - 2026/03/31

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    近年、臨床用高性能X線CT 、すなわち多面検出器を持つエリアディテクタX線Computed Tomography (AD320列CT)を用いた心臓CT検査の有用性が認められている。AD320列CTは検査時間が極めて短く1心拍の撮影時間で心臓全体の3次元の画像表示が可能である。だがX線CTは造影剤と被曝のリスクがある。そこで当研究は、臨床用AD320CTを用いて、造影剤と被ばくのリスクを軽減して負荷試験を可能とする低侵襲心機能解析法に関する新手法の開発を目指す。そのために、今年度は主に臨床用AD320列CTの被ばく線量の現状を詳細に調査した。すなわち臨床用AD320列CT を用いた心臓X線CTにおける、CTDI(computed tomography dose index)やDLP(dose length product)の現状の評価を行った。臨床用AD320列CTの2つの心臓CTモードにて調査した(①X線管電圧 120kV、X線管電流 AEC、 回転速度 0.24sec、 スライス厚 0.5mm、 320列 volume scan、②X線管電圧 100kV、X線管電流 AEC、 回転速度 0.24sec、 スライス厚 0.5mm、 320列 volume scan)。その結果、心臓X線CTの診断参考レベル(DRLs2020)は、CTDIは66mGy、DLPは1300mGycmであるので、CTDIとDLPは何れもDRLs2020より低値であることが確認できた。次年度は、臨床用AD320列CT を用いた心臓X線CTさらなる線量低減へ向けた詳細な基礎検討などを実施する予定である。(主な研究協力者:加藤聖規、藤沢昌輝、山田歩実、大野紗耶、今田聡恵、進藤僚太、山本啓介、下橋航大、高平咲希)

  9. 放射線計測と被曝防護を同時に実現するハイブリット型線量計デバイスの開発

    稲葉 洋平, 千田 浩一, 常陸 真, 加田 渉

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2023/04/01 - 2026/03/31

  10. 運動負荷カテーテル・MRI検査による肺高血圧症における潜在的な両心機能障害の精査

    山本 沙織, 安田 聡, 矢尾板 信裕, 千田 浩一, 大田 英揮, 宮田 敏, 佐藤 大樹

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2023/04/01 - 2026/03/31

  11. 実践的な課題解決能力を持つ高度放射線防護人材育成プログラム

    藤淵俊王, 千田浩一

    Offer Organization: 原子力規制庁

    2021/04 - 2026/03

  12. 医療用超高感度放射線被ばく線量計の開発研究と評価

    中村 正明, 千田 浩一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2021/04/01 - 2024/03/31

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    インターベンショナルラジオロジー(Interventional Radiology:IVR)は、外科手技と比べ低侵襲であり患者にとって極めて有用な治療法である。しかし、一方で放射線障害発生が重大問題である(国際放射線防護委員会 ICRP2000年勧告)。また厚労省から被曝対策強化の方針が出され過剰な医療被曝防止が国家的課題となっており、さらに医療被曝に対する国民の関心が高い。しかし実用的な高感度IVR用リアルタイム線量計は現在無く、より超高感度な測定システムが必要である。そこで当研究は超高感度リアルタイム被曝線量計開発の基礎として、X線検出部の蛍光体の輝度劣化現象と回復現象を検討し、超高感度線量計の検出部の開発に役立てる。まずはじめに、輝度劣化した蛍光体を作製するため蛍光体X線を連続照射して輝度劣化処理をした。そして、輝度劣化処理した蛍光体を用いて、基礎的検討を実施した。その結果、X線照射後の蛍光体を暗所保管したものと外光や照明下等の明所で保管したものでは明所保管の輝度回復がより大きいことを確認した。さらに光照射処理による輝度回復の初期実験を行った。光照射処理は、光照射の累積光量と輝度変化との関係を比較した。光照射条件は、蛍光ランプ以外の光による影響を避けるため暗室内に設置した蛍光灯スタンドに蛍光ランプを取り付けて光源とした。蛍光灯表面と蛍光体間距離が一定となるように蛍光体を配置し輝度劣化処理直後の蛍光体に光照射処理した。照射された光の放射照度は照度計で測定した。光照射処理後の蛍光体は速やかにX線照射をして輝度を測定した。初期検討結果から、照射した時の輝度変化は蛍光体種類、照射光の色によって様々であることが示唆された。引き続き基礎実験を行い詳細な検討を実施する予定である。 (主な研究協力者:加藤聖規、服部兼進、藤沢昌輝、山田歩実、石川諒椰)

  13. 歯科X線診療に資する患者被曝線量計の開発

    洞口 正之, 千田 浩一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2020/04/01 - 2023/03/31

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    歯科診療の高度化等に伴い、コーンビームX線CT(cone-beam computed tomography : CBCT)や携帯型口内法X線撮影などの歯科X線検査も増加している。歯科X線検査は繰返し撮影を行うことも多く、さらに放射線感受性の高い若年者の検査も多いため、放射線被曝評価は重要である。また歯科用CBCT装置の被曝線量は少なくないと言われている。よって歯科X線検査時の正確な患者被曝線量評価や線量低減は必要である。だが現在、歯科X線検査に資する患者リアルタイム線量計は無い。そのため歯科X線診療用のリアルタイム患者線量計開発および歯科診療患者の被曝低減を目指す。また歯科用CBCTの画質(物理評価)に関する報告は少ない。そこで今年度は主に下記の基礎的な研究および検討を実施した。まず、歯科用CBCT装置の線量(ビーム軸空気カーマなど)を測定し診断参考レベル(Diagnostic Reference Level: DRL)と比較検討した。歯科用CBCT装置の日本のDRLは高値であるが、180°撮影画像を用いることで画質を維持しながら、英国などのDRLを同等程度のレベルに低減できる可能性があることが示唆された。さらに歯科用CBCTの画質について、ファントムを用いた粒状性物理実験評価(noise power spectrum :NPSなど)を行った結果、180°撮影画像の粒状性(NPS)は有意な低下を示さないことが明らかになった。なお初期成果について3件の学会発表を行うことができた。以上の検討結果をもとに、今後基礎研究を発展させて、歯科X線診療に資するリアルタイム患者線量計の開発と画質を維持したうえでの患者被曝線量低減を目指す。 (研究分担者:千田浩一。主な研究協力者:伊藤実咲、稲葉洋平)

  14. 水晶体被曝を可視化する医療用ウェアラブル防護デバイスの開発

    稲葉 洋平, 千田 浩一, 常陸 真, 加田 渉

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2019/04/01 - 2023/03/31

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    放射線医療従事者の業務は、一般撮影(X線ポータブル撮影含む)・CT (Computed Tomography) ・IVR (Interventional Radiology) ・核医学 検査・放射線治療など多岐にわたる。2011年に国際放射線防護委員会 (ICRP) は、水晶体等価線量限度を今まで考えられてきたものより約1/8に引き下げる勧告(150 mSv/year → 20 mSv/year)をしたため、放射線従事者が放射線白内障になる危険性が大幅に増加することが危惧されており、可及的速やかな対応が国際的な課題となっている。ゆえにあらゆる医療従事者に水晶体防護策を施行するためには水晶体被曝を可視化して放射線防護教育することが今後の法改正に 向けて必要であるが水晶体防護と教育を併せ持つ医療用デバイスが存在しない。本研究では水晶体被曝を可視化できる医療用ウェアラブル型水晶体防護メガネの開発を試みる。 2019年度は、様々な放射線検査場の中で歯科領域、CT領域の平面および高さ双方の空間散乱線量分布の測定を行い、水晶体高さレベルでの3次元的な空間散乱線量の基礎データを得ることができた。また、実際に歯科X線装置およびCTガイド下インターベンションに従事するスタッフの被ばく線量測定を一部開始した。2020年度は、CT透視下インターベンション時の医師、看護師の放射線被曝測定を実施した(Inaba. Y, Diagnostics 2021)。2021年度は、ラジオフォトルミネセンス現象を用いて水晶体被曝を可視化できる眼鏡型の線量計デバイスを作成した。線量依存的にデバイス光量が増加することを確認した。さらには、当該デバイスが水晶体防護効果50%程度あることも確認した。

  15. Novel concept of IVR system based on object identification in X-ray fluroscopic images for drastic dose reduction

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2019/04/01 - 2023/03/31

  16. ハイブリッド手術における医療従事者の水晶体被曝線量評価に関する多施設共同研究

    米虫 敦, 千田 浩一, 松原 孝祐, 本郷 哲央

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 関西医科大学

    2016/04/01 - 2023/03/31

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    ハイブリッド手術における医療従事者の水晶体被曝線量評価に関する多施設共同研究について、研究参加施設のリクルートが進んでいる。臨床研究法により、倫理審査等の各施設での手続きの煩雑化が問題となっているが、各施設において対応が進んだ。 多施設共同 非ランダム化 前向きコホート試験として、ハイブリッド手術に従事する医療従事者(医師または看護師)の水晶体被曝量を測定する。 線量測定には超小型線量計(nanoDot線量計)およびクイクセルバッジを使用する。研究協力に同意が得られた測定対象者について、超小型線量計を取り付けた防護メガネ(パノラマシールド エクストラワイド)およびクイクセルバッジを使用して線量測定を行う。測定期間は1ヵ月として、期間中に従事したハイブリッド手術における被曝を測定する。 現時点で2施設での測定が終了した。 SARS-CoV-2によるCOVID-19流行により、一部の医療機関では、平時の臨床業務が制限を受けている状況にある。また、2021年より職業被ばくにおける線量限度が改定され、各施設における被ばく状況が本研究の開始時と比して変化している。このため、現時点で収集されたデータを取り纏めて、ハイブリッド手術における水晶体被ばくの検討を行う。 本研究により、X線透視を併用した手術に従事した医師、看護師の水晶体等価線量を、超小型線量計を取り付けた放射線防護メガネを使用して測定し、日本国内における実態の把握が可能となる。

  17. Development of evaluation and management of cardiac organ dose and breast dose in cardiac computed tomography and interventional radiology.

    Kato Mamoru, KINOSHITA toshibumi, ABE yoshihisa, SAKAMOTO hajime, TSUKAMOTO atsuko, MATSUMOTO kazuma, SUN lue, HAGA yoshihiro, SAKAMOTO kentarou, TAKAHASHI noriyuki, OOSAKA hajime

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Akita Cerebrospinal and Cardiovascular Center

    2016/04/01 - 2019/03/31

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    Recently, medical exposure has attracted international attention. In 2007, the International Commission on Radiological Protection (ICRP) published a new set of radiation weighting factors in order to assess the carcinogenic risk effectively. According to the publication, the radiation weighting factors for breast and heart were increased and corrected the risk assessment of stochastic effect. Furthermore, in ICRP Publication 118 (2013), it was reported that cardiac CT and IVR require high doses, which may cause radiation injury and increase the risk of cancer. In this study, we measured the breast incident dose of cardiac CT and IVR using many arrayed glass dosimeters in clinical. The results of breast incident dose of cardiac CT were 100mGy, and cardiac IVRs were 20mGy. On the other hand, the average absorbed heart organ dose using a chest phantom was 50mGy for Cardiac CT and 150mGy for cardiac IVR.

  18. Infrastructure Construction and Social Implementation for Support of Environmental Monitoring and Disaster Reduction by Cooperation of Citizens, Administration and Experts

    TANAKA Kenji, ISHIGAKI Yang

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: The University of Electro-Communications

    2015/04/01 - 2019/03/31

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    For environmental risks such as radiation, PM2.5, CBRNE terrorism (dirty bomb), and landslides caused by heavy rain, we have developed an inexpensive device that allows citizens to voluntarily measure the environment at multiple points. In addition, by visualizing measured values and location information from linking GPS, we realized a mechanism that can share measured information between citizens and administrative organizations (local governments, police, fire departments, hospitals etc.). Moreover, online discussion with experts has become possible. The effect of the training simulator USOTOPE developed to build those mechanisms is extremely large.

  19. New device for real-time temperature measurement during 3T-MR under the temperature rise associated with SAR: aiming for the development of rapid-sequence cardiac MR for rehabilitation patients

    CHIDA Koichi, KOHZUKI Masahiro, NAGASAKA Tatsuo

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2015/04/01 - 2018/03/31

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    Cardiac MRI, including that of rehabilitation patients, is a valuable non-invasive source of information on cardiac function. However, cardiac MR requires long examination times, which many rehabilitation patients cannot tolerate. Although 3T-MR was expected to facilitate shorter examination times, long examination times are still required due to the temperature rise associated with the SAR. This study describes the development of a new real-time temperature measurement device for MR, and our motivation is the expansion of short-duration MR sequences for cardiac rehabilitation patients. Our measurement system consists of non-magnetic thermocouple sensors, an electromagnetically shielded cable, and a display. The sensors and cables of the new thermometer resulted in almost no artifacts on MR images. The thermometer presented here is an effective tool for real-time temperature measurement during MR. Our measurement methods will aid the development of short-duration cardiac MR sequences.

  20. Development of a New Lead-shielding Device during Videofluoroscopic Swallowing Study

    MORISHIMA YOSHIAKI, WATANABE Hiroshi, MEGURO Yuko

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku Medical and Pharmaceutical University

    2015/04/01 - 2018/03/31

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    We have developed a radiation protection device of the self-made "Scattered radiation protection Box" and "Slide type protective plate" for physician protection during Videofluoroscopic Swallowing Study. The additional filter (1.0, 2.0, 3.0 mm Al and 0.5 mm Cu) was combined with these two to examine the effect of protecting the scatter radiation with the human phantom. As a result, the scattered radiation removal rate at 150 cm above the floor was 65.4% to 79.4% respectively. The scattered radiation removal rate at 90 cm above the floor was 30.1% to 62.8%, respectively, and the effect of scattered radiation protection at the physician position was observed. We believe that using a combination of scattered radiation protection box, sliding protective plate and additional filter is very effective for physician scatter radiation protection.

  21. Diagnostic Reference Levels and occupational eye lens doses for neurointerventional radiology

    MORITAKE Takashi, AKAHANE Keiichi, KATO Mamoru, HAYAKAWA Mikito

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: University of Occupational and Environmental Health, Japan

    2014/04/01 - 2018/03/31

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    Thorough this project, we have shown the exposure dose to the physician’s lens of the eye. Also, we could obtain the precise data on the lens dose of the patient who underwent neurointerventional radiology, using the RADIREC system we constructed. We found the DICOM-RDSR could be an useful tool for estimating the dose to the patient as well as managing the medical exposure automatically.

  22. Development of a new nontoxic dosimeter for real-time measurements of patient radiation doses

    ZUGUCHI MASAYUKI, YAMADA Shogo, CHIDA Koichi, NAKAMURA Masaaki, KATO Mamoru, INABA Yohei

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2014/04/01 - 2017/03/31

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    There are no effective real-time direct skin dosimeters for interventional radiology (IVR). Therefore, we produced a prototype of a real-time dosimeter for patients undergoing IVR that uses a nontoxic phosphor. The basic characteristics of the real-time dosimeter prototype are comparable to those of the previously used skin dose monitor (SDM), with the exception that our prototype has the distinct advantage of including multichannel sensors. The novel dosimeter exhibited equivalent performance with respect to energy dependence and linearity, etc., compared with an SDM. To date, no feasible method exists for measuring the radiation dose to the patient in real-time during IVR. Therefore, the novel real-time dosimeter system is expected to useful in measuring patients’ exposure dose during IVR.

  23. Improvement of patient dose management: Development of a patient radiation dose evaluation system

    CHIDA Koichi, MORITAKE Takashi, ZUGUCHI Masayuki, KATO Mamoru, TANO Masakatsu, NAKAMURA MasaAaki, DENDOU Yutaka, INABA Yohei

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2012/04/01 - 2016/03/31

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    Patient dose management using DICOM header files is becoming common. However, some problems have become apparent, because dose information may be stored in ‘private’ fields in many instances and dose units vary among manufacturers. Furthermore, it is not uncommon to find that a DICOM header file has no dose information. Therefore, it is imperative to standardize DICOM header dose information. Some recent reports have described the usefulness of patient dose management using DICOM SR. However, the use of DICOM SRs in X-ray systems is currently very limited. We have developed a dose-management system using an RIS and an MPPS interface. Both radiographic information from the X-ray system and dosimetric information from the DAP meter can be sent to the RIS using the MPPS interface. To improve dose management, it is necessary to use a combination of DICOM and an RIS system.

  24. Fundamental study of magnetic resonance examination for cardiac rehabilitation patient: Development of a real-time measurement device for temperature in the gantry during magnetic resonance imaging

    CHIDA Koichi, KOHZUKI Masahiro, ZUGUCHI Masayuki, NAGASAKA Tatsuo, NAKAMURA Masaaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2012/04/01 - 2015/03/31

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    The conventional cardiac magnetic resonance (MR) examination necessitates long examination times and impedes its utility as a diagnostic tool, since few cardiac patients can tolerate long procedures. Furthermore, even in current 3T-MRI, the long examination time results in a temperature rise associated with SAR. Most commercial real-time thermometer systems cannot be used for accurate temperature monitoring during MRI because they are made of magnetic materials. We have developed a novel, direct real-time temperature measurement system for use during MRI procedures. The system consists of sensors with thermocouples using non-magnetic materials, a cable with electromagnetic shielding, and a display system. The sensors and cables of the new thermometer resulted in no artifacts on MRI. The new thermometer presented here is a very effective tool for real-time temperature measurement during MRI. Furthermore, such measurement methods will aid the development of short-term MRI sequences.

  25. Study on a comprehensive radiation exposure management protocol for measuring patient entrance doses in cardiac interventional procedures and cardiac computed tomography.

    KATO Mamoru, CHIDA Koichi, MORITAKE Takashi, SATO Tadaya, ABE Yosjihisa

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2012/04/01 - 2015/03/31

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    Interventional cardiology, such as percutaneous coronary intervention (PCI), are increasingly being adopted in the treatments for coronary artery disease. Unfortunately, several cases of skin injury caused by radiation exposure are still being reported in association with PCIs. Furthermore, coronary computed tomography (CT), which is a promising non-invasive technique for the detection of coronary stenosis, is increasingly utilized for the preoperative examination and postoperative assessment of PCI. Compared to other CT examinations, coronary CT examinations deliver a higher dose. In addition, many CT protocols do not provide a method for evaluating the patient entrance skin dose. Thus, high radiation doses may have deterministic effects. Using multiple radiophotoluminescence glass dosimeters with a modified dosimetry gown to measuring the entrance skin doses in PCI and coronary CT, we developed a comprehensive radiation exposure management protocol to prevent radiation skin injuries.

  26. Fundamental study of a Real-time Dosimeter using a Diagnostic X-rayApparatus for Interventional Radiology

    ZUGUCHI Masayuki, CHIDA Koichi, NAKAMURA Masaaki, KATO Mamoru, INABA Yohei

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2010 - 2012

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    Radiation protection is an important issue in interventional radiology (IVR) for which the radiation dose should be monitored. To protect against patient skin injury, the radiation dose should be monitored in real-time. When more than one effective working view is available, a combination of different viewing angles and real-time monitoring of patient dose can be used to prevent any one skin area from receiving excessive radiation, thereby reducing the risk of skin injury. However, no feasible real-time patient dose measuring method has been established. The purpose of this study was to evaluate the feasibility of using real-time dosimeter to measure patient skin exposure dose after exposure to diagnostic X-ray energies during IVR. The real-time dosimeter detector consists of x-ray scintillator, optical fiber and photodiode. The real-time dosimeter was not visible on X-ray images at diagnostic energies. Furthermore, the real-time dosimeter is easy to handle. Therefore, it will be feasible to use the real-time dosimeter at diagnostic X-ray energies for measuring patient dose during IVR.

  27. Standardization of patient dosimetry for interventional radiology

    MORITAKE Takashi, SAKAE Takeji, CHIDA Koichi, MATSUMARU Yuji, MIZUNO Yusuke, HAYAKAWA Mikito

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: University of Tsukuba

    2009 - 2011

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    Interventional radiology is increasingly being adopted in the treatment of various diseases because of its low invasiveness. However, the entrance skin doses (ESDs) exceed several Gy for each procedure in most cases. We therefore built a system for precise mapping of ESDs using a number of radiophotoluminescence glass dosimeters to reduce the dose of patient. We also concluded that the precise dose mapping accompanied by monitoring of angiographic parameters during the procedure should contribute to reducing X-ray dose accumulation.

  28. PROTECTIVE APRON FOR IVR PHYSICIANS

    ZUGUCHI Masayuki, CHIDA Koichi, YAMADA Shogo, CHIDA Koichi, YAMADA Shogo, NAKAMURA Masaaki, SATO Tadaya, KATO Kato, INABA Inaba, TAURA Masaaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2007 - 2008

  29. MRI examination during dynamic muscular exercise

    CHIDA Koichi, KOHZUKI Masahiro, ZUGUCHI Masayuki, KOHZUKI Masahiro, ZUGUCHI Masayuki, NAGASAKA Tatsuo, ITO Daisuke, SHIMURA Hirotaka

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2007 - 2008

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Teaching Experience 33

  1. 医用写真学 東北大学

  2. 臨床撮影技術学Ⅰ 東北大学

  3. 放射線工学概論 東北文化学園大学

  4. 災害の科学 東北大学

  5. 卒業研究 東北大学

  6. 放射線関係法規 東北大学

  7. Radiological Examination and Technology 東北大学

  8. Laws and Regulations for Radiologic Technologist 東北大学

  9. Radiation Equipment Engineering 東北大学

  10. Radiation Dosimetry 東北大学

  11. Clinical Radiological Technique Seminar II 東北大学

  12. Technique of clinical Imaging 東北大学

  13. Clinical Radiological Technique Seminar I 東北大学

  14. Doctoral Dissertation Research 東北大学

  15. Paper research & Basic seminar 東北大学

  16. 応用セミナー 東北大学

  17. 基礎セミナー 東北大学

  18. 放射線技術学実験II 東北大学

  19. 放射線技術学実験I 東北大学

  20. 放射線機器工学II 東北大学

  21. 放射線機器工学I 東北大学

  22. 医用工学実習 東北大学

  23. 放射線計測学実験II 東北大学

  24. 放射線計測学実験I 東北大学

  25. 医用工学 東北大学

  26. 放射線基礎医学 物理 東北大学

  27. 放射線計測学II 東北大学

  28. 放射線計測学I 東北大学

  29. 分野特論 東北大学

  30. 分野セミナー 東北大学

  31. 応用セミナーI 東北大学

  32. カレントトピックス 東北大学

  33. 基礎ゼミ 東北大学

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Social Activities 35

  1. [日本国内] 日本血管撮影・インターベンション専門診療放射線技師認定機構委員

    2007/10 - Present

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    日本血管撮影・インターベンション専門診療放射線技師認定機構委員として、その設立に加わり同機構運営に携わった。また同試験委員として尽力した。

  2. [日本国内] 放射線技師会医療安全学セミナー講師

    2003/04 - Present

  3. [日本国内] 日本放射線技術学会医療被曝測定セミナー講師

    2004/01 - 2007/12

  4. [日本国内] 産業医科大学・早稲田大学「医工連携合同セミナー」講師

    2014/03/13 -

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    「福島原発事故後における対応」と題して招待講演を行った。

  5. [日本国内] 第39回全国助産師教育協議会研修会講師

    2014/02/22 -

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    「放射能とは?保健指導でどのように教えるか」と題して教育講演を行った。

  6. [日本国内] 弘前大学「平成25年度 被ばく医療プロフェッショナル育成計画」セミナ講師

    2013/09/11 -

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    「被ばく放射線科学」医療被曝・職業被曝の集中講義を行った。

  7. [日本国内] 平成25年度市民公開講座相談員 放射線・放射能を正しく理解するための市民公開講座(福島市)

    2013/05/12 -

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    日本放射線技術学会主催の表記の市民公開講座において、「放射能放射線」に関する質問に対して回答を行った。

  8. [日本国内] 宮城県仙台市中学校理科教育研究会講演会講師

    2013/01/12 -

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    「放射能のリスクと健康影響」と題して教育講演を行った。

  9. [日本国内] 第22回医療被ばく測定セミナ(日本放射線技術学会主催)講師

    2012/09/15 -

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    第22回医療被ばく測定セミナー(山形市)の講師を行った。

  10. [日本国内] 弘前大学「平成24年度 被ばく医療プロフェッショナル育成計画」セミナ講師

    2012/09/11 -

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    「被ばく放射線科学」医療被曝・職業被曝の集中講義を行った。

  11. [日本国内] 日本消化器がん検診学会 東北支部部会研修会講師

    2012/07/13 -

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    放射線の人体影響に関する基礎知識と題して教育講演を行った。

  12. [日本国内] 筑波大学集中講座「放射線科学 その基礎理論と応用」 講師

    2012/05/17 -

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    放射能に関する正しい知識と題して教育講演を行った。

  13. [日本国内] 平成24年度市民公開講座講師 放射線・放射能を正しく理解するための市民公開講座(福島市)

    2012/05/12 -

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    日本放射線技術学会主催の表記の市民公開講座において、「被ばく量を正しく推定するために」に関する講演を行った。

  14. [日本国内] KCJL2012(第10回近畿心血管治療ジョイントライブ)講師

    2012/04/20 -

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    コメディカル(特に看護師さん)のための放射線被ばくのお話しと題して教育講演を行った。

  15. [日本国内] 日本混相流学会「環境再生に向けた震災復興シンポジウム」講師

    2012/03/15 -

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    表記についてシンポジストとして参加し「放射能の人体等への影響について」講演した。

  16. [日本国内] 福島県伊達市大枝小学校PTA教育講演会講師

    2012/01/24 -

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    「放射能汚染の現状と健康被害の予防について」と題して教育講演を行った。

  17. [日本国内] 亘理郡医師会産業医学研修会講師

    2011/11/15 -

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    「事業所における放射能の影響と対策」について講演した。

  18. [日本国内] 弘前大学「被ばく医療プロフェッショナル育成計画」セミナー講師

    2011/09/20 -

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    「被ばく放射線科学」医療被曝・職業被曝の講義を行った。

  19. [日本国内] みやぎ生協 食品の安全推進本部講演会講師

    2011/07/21 -

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    「放射線ひばくの基礎知識」と題して、教育講演を行った。

  20. [日本国内] 平成23年度市民公開講座講師 放射線・放射能を正しく理解するための市民公開講座(福島市)

    2011/07/10 -

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    「シーベルトやベクレルってなに?放射線の単位と測定方法を学ぼう」について講演し、さらにコメンテータとして総合討論を行った。

  21. [日本国内] 第12回千葉アンギオ技術研究会講師

    2011/07 -

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    教育講演講師

  22. [日本国内] 第29 回日本Metallic Stents & Grafts 研究会講師

    2011/05 -

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    教育講演講師

  23. [日本国内] 高大連携講座(佐沼高校)

    2010/07/21 -

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    「エックス線検査の放射線被ばく」について公開講座を行った。

  24. [日本国内] 第27回CVIT東北地方会講師

    2010/01 -

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    放射線防護講習会講師

  25. [日本国内] 第21回循環器被ばく低減技術セミナー講師

    2009/09 -

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    教育講演講師

  26. [日本国内] 第105回日本シネアンジオ研究会シンポジウム講師

    2009/06 -

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    基調講演(冠動脈造影に関係した放射線被曝について)

  27. [日本国内] 第64回日本放射線技術学会総会学術大会セミナー講師

    2008/04 -

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    セミナー講師(患者総入射皮膚線量と最大皮膚線量との関係)

  28. [日本国内] 第6回秋田PCIライブセミナー講師

    2007/11 -

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    セミナー講師(PCI時の放射線被曝)

  29. [日本国内] 日本放射線技師会平成19年度医療安全学セミナ講師

    2007/07 -

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    講師(電離放射線施設での安全性)

  30. [日本国内] 第21回日本心血管インターベンション学会東北地方会特別講演講師

    2007/01 -

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    特別講演講師

  31. [日本国内] 全国循環器撮影研究会被曝低減技術セミナー講師

    2006/09 -

  32. [日本国内] 東北厚生年金病院セミナー講師

    2006/06 -

  33. [日本国内] 日本放射線技術学会技術活用セミナー講師

    2006/04 -

  34. [日本国内] 診療放射線技師実習施設指導者等養成講習会講師

    2005/10 -

  35. [日本国内] 仙台PTCAネットワークセミナー講師

    2003/09 -

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Other 20

  1. 災害時等における医用X線写真撮影用のX線発生システムの開発

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    災害時等における医用X線写真撮影用のX線発生システムの開発を行った。

  2. 医用X線透視撮影装置(フラットパネル)用QCQAファントムの実用化

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    医用X線透視撮影装置(フラットパネル)用QCQAファントムの実用化

  3. FPD搭載IVR用X線装置のための品質保証管理法の開発

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    FPD搭載IVR用X線装置のための品質保証管理法の開発

  4. 医学研究者の教育研修に関する助成

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    医学研究者の教育研修に関する助成

  5. Acta Radiologica誌のカバーページ

  6. American Roentgen Ray Societyからプレスリリース

  7. 総合健診における診断と治療法に関する研究

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    総合健診における診断と治療法に関する研究

  8. 胸部IVR被曝計測

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    胸部IVR被曝計測

  9. 心臓血管カテーテル治療用X線装置の放射線被曝線量測定調査

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    心臓血管カテーテル治療用X線装置の放射線被曝線量測定調査

  10. カテーテルインターベンションにおける患者放射線被ばく評価のための

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    カテーテルインターベンションにおける患者放射線被ばく評価のための

  11. 総合健診における診断と治療法に関する研究

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    総合健診における診断と治療法に関する研究

  12. 国際学会等派遣事業

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    国際学会等派遣事業

  13. 国際研究集会海外派遣助成金

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    国際研究集会海外派遣助成金

  14. 放射線管理用測定器の測定精度比較評価

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    放射線管理用測定器の測定精度比較評価

  15. 国際学会派遣助成金

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    国際学会派遣助成金

  16. 海外学会派遣助成金

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    海外学会派遣助成金

  17. 心血管IVR被曝評価に関する研究

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    心血管IVR被曝評価に関する研究

  18. 国際研究集会等海外派遣助成金

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    国際研究集会等海外派遣助成金

  19. 乳癌検診用マンモグラフィーシステムの最適化に関する研究

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    乳癌検診用マンモグラフィーシステムの最適化に関する研究

  20. 国際研究集会への出席旅費の一部援助

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    国際研究集会への出席旅費の一部援助

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