Details of the Researcher

PHOTO

Yoshitaka Toyama
Section
Graduate School of Medicine
Job title
Senior Assistant Professor
e-Rad No.
30770862

Awards 3

  1. 優秀演題賞

    2020/07 第87回日本核医学北日本地方会 機械学習を用いた膵癌FDG-PETの予後予測

  2. 教育展示優秀賞

    2017/04 日本医学放射線学会 副腎のPET imaging

  3. 優秀演題賞

    2016/10 日本核医学北日本地方会 123I-FP- CITと123I-MIBGを用いたパーキンソンニズムの鑑別方法

Papers 29

  1. Response accuracy of GPT-4 across languages: insights from an expert-level diagnostic radiology examination in Japan.

    Ayaka Harigai, Yoshitaka Toyama, Mitsutoshi Nagano, Mirei Abe, Masahiro Kawabata, Li Li, Jin Yamamura, Kei Takase

    Japanese journal of radiology 43 (2) 319-329 2025/02

    DOI: 10.1007/s11604-024-01673-6  

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    PURPOSE: This study aims to investigate the effects of language selection and translation quality on Generative Pre-trained Transformer-4 (GPT-4)'s response accuracy to expert-level diagnostic radiology questions. MATERIALS AND METHODS: We analyzed 146 diagnostic radiology questions from the Japan Radiology Board Examination (2020-2022), with consensus answers provided by two board-certified radiologists. The questions, originally in Japanese, were translated into English by GPT-4 and DeepL and into German and Chinese by GPT-4. Responses were generated by GPT-4 five times per question set per language. Response accuracy was compared between languages using one-way ANOVA with Bonferroni correction or the Mann-Whitney U test. Scores on selected English questions translated by a professional service and GPT-4 were also compared. The impact of translation quality on GPT-4's performance was assessed by linear regression analysis. RESULTS: The median scores (interquartile range) for the 146 questions were 70 (68-72) (Japanese), 89 (84.5-95.5) (GPT-4 English), 64 (55.5-67) (Chinese), and 56 (46.5-67.5) (German). Significant differences were found between Japanese and English (p = 0.002) and between Japanese and German (p = 0.022). The counts of correct responses across five attempts for each question were significantly associated with the quality of translation into English (GPT-4, DeepL) and German (GPT-4). In a subset of 31 questions where English translations yielded fewer correct responses than Japanese originals, professionally translated questions yielded better scores than those translated by GPT-4 (13 versus 8 points, p = 0.0079). CONCLUSION: GPT-4 exhibits higher accuracy when responding to English-translated questions compared to original Japanese questions, a trend not observed with German or Chinese translations. Accuracy improves with higher-quality English translations, underscoring the importance of high-quality translations in improving GPT-4's response accuracy to diagnostic radiology questions in non-English languages and aiding non-native English speakers in obtaining accurate answers from large language models.

  2. MAO-B特異的PETトレーサー18F-SMBT-1による脳腫瘍検体のAutoradiography

    阿部 未玲, 外山 由貴, 清水 悠暉, 原田 龍一, 三木 康宏, 高浪 健太郎, 金森 政之, 鈴木 貴, 高瀬 圭, 古本 祥三, 田代 学

    核医学 62 (Suppl.) S178-S178 2025

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  3. Role of radiologists in the diagnosis and management of adrenal disorders.

    Sota Oguro, Hiromitsu Tannai, Hideki Ota, Kazumasa Seiji, Hiroki Kamada, Yoshitaka Toyama, Kei Omata, Yuta Tezuka, Yoshikiyo Ono, Fumitoshi Satoh, Sadayoshi Ito, Tetsuhiro Tanaka, Hideki Katagiri, Kei Takase

    Endocrine journal 2024/10/10

    DOI: 10.1507/endocrj.EJ24-0156  

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    This study aimed to focus on the role of radiologists in the diagnosis and management of adrenal lesions, particularly primary aldosteronism (PA) and secondary hypertension. As hypertension affects more than one-third of the population in Japan, identifying secondary causes such as PA and adrenal lesions is crucial. Establishing a radiological differential diagnosis of adrenal lesions using advanced imaging techniques, such as computed tomography and magnetic resonance imaging, is crucial. Knowledge of the imaging findings of various benign and malignant adrenal lesions, such as adrenocortical adenomas, cortisol-producing lesions, pheochromocytomas, adrenocortical carcinoma, malignant lymphoma, and metastatic tumors, is necessary. Adrenal venous sampling (AVS) plays a crucial role in accurately localizing aldosterone hypersecretion in PA, especially when imaging fails to provide a clear diagnosis. This paper details the technical aspects of AVS, emphasizing catheterization techniques, anatomical considerations, and the importance of preprocedural imaging for successful sampling. Furthermore, we explore segmental adrenal venous sampling (SAVS), a more refined technique that samples specific adrenal tributary veins, offering enhanced diagnostic accuracy, particularly for microadenomas or challenging cases that may be missed with conventional AVS. The methodology for performing SAVS, along with the interpretation criteria for successful sampling and lateralization, is also outlined. Furthermore, radiologists have initiated treatments for unilateral PA, such as radiofrequency ablation, and play an integral role in the management of adrenal lesions. Collaborative approaches across clinical departments are required to enhance patient management in medical care involving the adrenal gland.

  4. Reply to "The R.E.N.A.L. nephrometry scoring from CT reports with ChatGPT: example with proofs".

    Ayaka Harigai, Yoshitaka Toyama, Kei Takase

    Japanese journal of radiology 42 (8) 932-933 2024/08

    DOI: 10.1007/s11604-024-01599-z  

  5. Reply to "Assessing the diagnostic performance of large language models with European Diploma in Musculoskeletal Radiology (EDiMSK) examination sample questions".

    Ayaka Harigai, Yoshitaka Toyama, Kei Takase

    Japanese journal of radiology 42 (6) 675-676 2024/06

    DOI: 10.1007/s11604-024-01556-w  

  6. Letter to the editor response to "ChatGPT, GPT-4, and bard and official board examination: comment".

    Ayaka Harigai, Yoshitaka Toyama, Kei Takase

    Japanese journal of radiology 42 (2) 214-215 2024/02

    DOI: 10.1007/s11604-023-01515-x  

  7. アルドステロン産生腺腫を標的としたPETプローブ開発 構造活性相関と比較研究

    大高 憧子, 清水 悠暉, 山崎 有人, 手塚 雄太, 鷹尾 月舟, 尾股 慧, 小野 美澄, 外山 由貴, 原田 龍一, 金田 朋洋, 古本 祥三

    核医学 61 (Suppl.) S149-S149 2024

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  8. Performance evaluation of ChatGPT, GPT-4, and Bard on the official board examination of the Japan Radiology Society

    Yoshitaka Toyama, Ayaka Harigai, Mirei Abe, Mitsutoshi Nagano, Masahiro Kawabata, Yasuhiro Seki, Kei Takase

    Japanese Journal of Radiology 2023/10/04

    DOI: 10.1007/s11604-023-01491-2  

  9. Type 2 Endoleak Detection After Endovascular Aneurysm Repair: Can Low-Flow Endoleaks Also Be Visualized in Silicon-Photomultiplier-Based Positron Emission Tomography/Computed Tomography Scans? International-journal

    Ayaka Harigai, Yoshitaka Toyama, Michihisa Umetsu, Kentaro Takanami, Kei Takase

    Journal of endovascular therapy : an official journal of the International Society of Endovascular Specialists 15266028231185237-15266028231185237 2023/07/02

    DOI: 10.1177/15266028231185237  

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    PURPOSE: To present a novel clinical application of silicon-photomultiplier-based positron emission tomography (SiPM-based PET)/computed tomography (CT), detecting a type II endoleak 5 years after endovascular aneurysm repair (EVAR). TECHNIQUE: SiPM-based PET/CT scans with a standard whole-body protocol were performed for a 73-year-old man with a past medical history of abdominal aortic aneurysms treated with EVAR and currently under investigation of his duodenal papillary carcinoma. The PET/CT demonstrated 18F-fluorodeoxyglucose (FDG) accumulation outside the stent graft in the native sac of the aneurysm. The site of accumulation corresponded to that of the contrast enhancement depicted in the CT angiography taken 1 month earlier. Another CT scan performed 3 months later revealed enlargement of the aneurysm. CONCLUSION: SiPM-based PET/CT, with its superior sensitivity and spatial resolution over conventional PET/CT, can detect type II low-flow endoleaks. CLINICAL IMPACT: Abnormal intra-aneurysmal FDG activity incidentally detected on SiPM-based PET/CT is worthy of attention because it may be indicative of endoleaks. Additional imaging using different modalities should be considered so that the patient would not miss the additional treatment opportunity upon observing sac enlargement. For patients with contraindications for iodine CT contrast media, SiPM-based PET/CT would serve as a suitable alternative.

  10. 18 F-FDG PET/CT Imaging Post Heart Transplantation Depicts High Accumulation at Sites of Previous Ventricular Assist Device Insertion. International-journal

    Yoshitaka Toyama, Masayuki Otani, Nobuhiro Yaoita, Kentaro Takanami, Kei Takase

    Clinical nuclear medicine 48 (4) 366-369 2023/04/01

    DOI: 10.1097/RLU.0000000000004580  

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    A 37-year-old man with previous heart transplantation for dilated cardiomyopathy underwent screening for malignancy under posttransplantation immunosuppression. 18 F-FDG PET/CT revealed uptake in 2 peritoneal sites of the pericardium that corresponded to the insertion sites of a left ventricular assist device that was used before transplantation. Additional abnormal uptake in the right axillary artery, aortic arch, and left femoral artery corresponded to the insertion sites for arterial inflow during cardiopulmonary bypass. Knowledge that FDG accumulation may occur at the insertion sites of an extracorporeal-circulation device enables unnecessary tests to be avoided.

  11. 原発性アルドステロン症診断に向けた新規CYP11B2 PETプローブの開発

    清水 悠暉, 田中 暉之, 鷹尾 月舟, 外山 由貴, 山崎 有人, 手塚 雄太, 石川 洋一, 原田 龍一, 古本 祥三

    核医学 60 (Suppl.) S218-S218 2023

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  12. Current and future perspectives on functional molecular imaging in nephro-urology: theranostics on the horizon International-journal Peer-reviewed

    Yoshitaka Toyama, Rudolf A. Werner, Camilo A. Ruiz-Bedoya, Alvaro A. Ordonez, Kei Takase, Constantin Lapa, Sanjay K. Jain, Martin G. Pomper, Steven P. Rowe, Takahiro Higuchi

    Theranostics 11 (12) 6105-6119 2021

    Publisher: Ivyspring International Publisher

    DOI: 10.7150/thno.58682  

    ISSN: 1838-7640

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    In recent years, a paradigm shift from single-photon-emitting radionuclide radiotracers toward positron-emission tomography (PET) radiotracers has occurred in nuclear oncology. Although PET-based molecular imaging of the kidneys is still in its infancy, such a trend has emerged in the field of functional renal radionuclide imaging. Potentially allowing for precise and thorough evaluation of renal radiotracer urodynamics, PET radionuclide imaging has numerous advantages including precise anatomical co-registration with CT images and dynamic three-dimensional imaging capability. In addition, relative to scintigraphic approaches, PET can allow for significantly reduced scan time enabling high-throughput in a busy PET practice and further reduces radiation exposure, which may have a clinical impact in pediatric populations. In recent years, multiple renal PET radiotracers labeled with 11C, 68Ga, and 18F have been utilized in clinical studies. Beyond providing a precise non-invasive read-out of renal function, such radiotracers may also be used to assess renal inflammation. This manuscript will provide an overview of renal molecular PET imaging and will highlight the transformation of conventional scintigraphy of the kidneys toward novel, high-resolution PET imaging for assessing renal function. In addition, future applications will be introduced, e.g. by transferring the concept of molecular image-guided diagnostics and therapy (theranostics) to the field of nephrology.

  13. Prognostic value of FDG-PET radiomics with machine learning in pancreatic cancer. International-journal

    Yoshitaka Toyama, Masatoshi Hotta, Fuyuhiko Motoi, Kentaro Takanami, Ryogo Minamimoto, Kei Takase

    Scientific reports 10 (1) 17024-17024 2020/10/12

    DOI: 10.1038/s41598-020-73237-3  

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    Patients with pancreatic cancer have a poor prognosis, therefore identifying particular tumor characteristics associated with prognosis is important. This study aims to investigate the utility of radiomics with machine learning using 18F-fluorodeoxyglucose (FDG)-PET in patients with pancreatic cancer. We enrolled 161 patients with pancreatic cancer underwent pretreatment FDG-PET/CT. The area of the primary tumor was semi-automatically contoured with a threshold of 40% of the maximum standardized uptake value, and 42 PET features were extracted. To identify relevant PET parameters for predicting 1-year survival, Gini index was measured using random forest (RF) classifier. Twenty-three patients were censored within 1 year of follow-up, and the remaining 138 patients were used for the analysis. Among the PET parameters, 10 features showed statistical significance for predicting overall survival. Multivariate analysis using Cox HR regression revealed gray-level zone length matrix (GLZLM) gray-level non-uniformity (GLNU) as the only PET parameter showing statistical significance. In RF model, GLZLM GLNU was the most relevant factor for predicting 1-year survival, followed by total lesion glycolysis (TLG). The combination of GLZLM GLNU and TLG stratified patients into three groups according to risk of poor prognosis. Radiomics with machine learning using FDG-PET in patients with pancreatic cancer provided useful prognostic information.

  14. 18F-FDG PET/CT Imaging of Vasculitis Complicated With Relapsing Polychondritis. International-journal

    Hiroki Kamada, Kentaro Takanami, Yoshitaka Toyama, Mioko Saito, Kei Takase

    Clinical nuclear medicine 45 (7) e327-e328 2020/07

    DOI: 10.1097/RLU.0000000000003060  

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    We present a case of a 38-year-old woman who complained with cough, fever, and back pain with a weight loss. F-FDG PET/CT to search fever origin revealed uptake in the tracheobronchial and the left auricular cartilage and wall of the thoracic aorta. She underwent biopsy of the left auricle and was diagnosed with relapsing polychondritis (RP) complicating vasculitis. After steroid therapy, FDG PET/CT demonstrated regression of inflammation, showing decreases in the uptakes. Vasculitis should be considered in case of RP with systemic manifestations. Our case demonstrated the utility of FDG PET/CT in evaluation of RP lesions including aortitis.

  15. 結腸癌に連続するFDG高集積のPET/CT所見と病理所見の比較検討

    加賀谷 由里子, 外山 由貴, 太田 瑛梨, 前川 由依, 齊藤 美穂子, 高浪 健太郎, 高瀬 圭, 渡辺 みか, 藤島 史喜

    核医学 57 (1) 4-5 2020

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  16. FDG-PETで指摘し得た顕微鏡的多発血管炎(MPA)の1症例

    太田 瑛梨, 加賀谷 由里子, 前川 由依, 外山 由貴, 齊藤 美穂子, 高浪 健太郎, 高瀬 圭

    核医学 57 (1) 5-5 2020

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  17. 最新半導体PET/CTにおける上腹部病変への呼吸同期の有用性

    外山 由貴, 高浪 健太郎, 太田 瑛梨, 加賀谷 由里子, 前川 由依, 齊藤 美穂子, 高瀬 圭

    核医学 57 (1) 5-5 2020

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  18. 新型FDG PETで多数の神経節に集積を認めたNeurolymphomatosisの一例

    加藤 恵里奈, 外山 由貴, 太田 瑛梨, 高橋 梢, 前川 由依, 加賀谷 由里子, 村田 隆紀, 斎藤 美穂子, 高浪 健太郎, 高瀬 圭

    核医学 56 (1) 101-101 2019/07

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  19. 半導体検出器を搭載した新PET装置による口腔がんリンパ節転移の診断精度

    小嶋 郁穂, 高浪 健太郎, 小川 武則, 外山 由貴, 齊藤 美穂子, 阪本 真弥, 飯久保 正弘, 高橋 哲

    歯科放射線 59 (増刊) 49-49 2019/06

    Publisher: (NPO)日本歯科放射線学会

    ISSN: 0389-9705

    eISSN: 2185-6311

  20. NETの局在診断 SACIテストとオクトレオスキャンの比較

    井上 麻美, 外山 由貴, 佐藤 友美, 柳垣 聡, 村中 美千帆, 前川 由依, 齊藤 美穂子, 高浪 健太郎, 高瀬 圭

    Japanese Journal of Radiology 37 (Suppl.) 10-10 2019/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 1867-1071

    eISSN: 1867-108X

  21. ソマトスタチン受容体シンチの生理的集積と偽陽性・偽陰性

    鎌田 裕基, 外山 由貴, 齊藤 美穂子, 高浪 健太郎, 高瀬 圭

    核医学 55 (1) 38-38 2018/12

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  22. 当院における塩化ラジウム(223Ra)の初期経験

    太田 瑛梨, 鎌田 裕基, 外山 由貴, 齋藤 美穂子, 高浪 健太郎, 高瀬 圭, 高橋 紀善, 石川 陽二郎, 山本 貴也, 梅澤 玲, 松下 晴雄, 神宮 啓一

    核医学 55 (1) 37-37 2018/12

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  23. FDG-PETで高集積を呈した稀な腹壁病変の一例

    樋口 慧, 外山 由貴, 前川 由衣, 齋藤 美穂子, 高浪 健太郎, 高瀬 圭, 植松 智海, 佐藤 聡子

    核医学 55 (1) 41-41 2018/12

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  24. 最新型半導体PETと従来型PETにおける下垂体FDG集積と視認性の比較検討

    加賀谷 由里子, 外山 由貴, 太田 瑛梨, 前川 由依, 斎藤 美穂子, 高浪 健太郎, 高瀬 圭

    核医学 55 (Suppl.) S208-S208 2018/11

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  25. 自然縮小した胸腺腫の1例

    大山 翼, 袴塚 崇, 榊原 宏幸, 森下 陽平, 伊藤 幸, 高橋 祐輝, 野村 脩子, 大村 健介, 前川 由衣, 加賀谷 由里子, 長谷川 哲也, 木下 知, 佐藤 嘉尚, 外山 由貴, 冨永 循哉, 高瀬 圭

    Japanese Journal of Radiology 35 (Suppl.) 8-8 2017/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 1867-1071

    eISSN: 1867-108X

  26. 冠状動脈-肺動脈瘻に合併した動脈瘤に対する塞栓術の1例

    榊原 宏幸, 大田 英揮, 伊藤 幸, 森下 陽平, 高橋 祐輝, 大村 健介, 野村 脩子, 加賀谷 由里子, 前川 由依, 木下 知, 長谷川 哲也, 佐藤 嘉尚, 外山 由貴, 佐藤 友美, 嶋内 亜希子, 森 菜緒子, 松浦 智徳, 北見 昌広, 常陸 真, 齊藤 美穂子, 冨永 循哉, 清治 和将, 高瀬 圭

    Japanese Journal of Radiology 35 (Suppl.) 8-8 2017/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 1867-1071

    eISSN: 1867-108X

  27. 胆嚢悪性リンパ腫の1例

    森下 陽平, 長谷川 哲也, 伊藤 幸, 榊原 宏幸, 高橋 祐輝, 大村 健介, 野村 脩子, 加賀谷 由里子, 前川 由依, 木下 知, 佐藤 嘉尚, 外山 由貴, 佐藤 友美, 嶋内 亜希子, 森 菜緒子, 松浦 智徳, 大田 英揮, 北見 昌広, 常陸 真, 齊藤 美穂子, 冨永 循哉, 清治 和将, 高瀬 圭

    Japanese Journal of Radiology 35 (Suppl.) 10-10 2017/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 1867-1071

    eISSN: 1867-108X

  28. 123I-MIBG心筋シンチグラフィと123I-FP-CIT SPECTを用いたLewy小体病とその類縁疾患の鑑別方法

    外山 由貴, 高浪 健太郎, 森下 陽平, 高瀬 圭

    臨床放射線 62 (1) 189-198 2017/01

    Publisher: 金原出版(株)

    ISSN: 0009-9252

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    Lewy小体病は、その他パーキンソニズムを呈する神経変性疾患やアルツハイマー病などと区別されるが、その鑑別は難しい。鑑別に当っては画像診断の果たす役割は大きく、その中でも核医学分野の機能画像診断は有用である。123I-FP-CIT SPECTと123I-MIBG心筋シンチグラフィーを組み合わせることで、Lewy小体病の診断精度が上がるだけでなく、その類縁疾患などを診断する助けになる。その二つの検査を使った鑑別法を「4分割法」とし、理論と運用法を紹介した。

  29. Lipomatous hypertrophy of the interatrial septumが疑われた症例

    前川 由依, 外山 由貴, 荒井 晃, 高浪 健太郎, 高瀬 圭, 瀧 靖之

    核医学 53 (1) 509-509 2016/02

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

Show all ︎Show first 5

Misc. 6

  1. 心電図同期心筋血流SPECTによる心機能解析:その原理と臨床的有用性

    木曽啓祐, 高浪健太郎, 齊藤美穂子, 外山由貴, 前川由依, 益田淳朗, 高瀬圭

    日本医学放射線学会秋季臨床大会抄録集 58th 2022

    ISSN: 0048-0428

  2. 原発性アルドステロン症診断を目的としたアルドステロン合成酵素PETプローブの開発

    田中 暉之, 鷹尾 月舟, 外山 由貴, 山崎 有人, 手塚 雄太, 石川 洋一, 古本 祥三

    核医学 56 (Suppl.) S157-S157 2019/10

    Publisher: (一社)日本核医学会

    ISSN: 0022-7854

    eISSN: 2189-9932

  3. 半導体検出器を搭載した新PET装置による口腔がんリンパ節転移の診断精度

    小嶋 郁穂, 高浪 健太郎, 小川 武則, 外山 由貴, 齊藤 美穂子, 阪本 真弥, 飯久保 正弘, 高橋 哲

    歯科放射線 59 (増刊) 49-49 2019/06

    Publisher: (NPO)日本歯科放射線学会

    ISSN: 0389-9705

    eISSN: 2185-6311

  4. リンパ管造影が有効であったPulmonary lymphatic perfusion syndromeによる難治性乳び胸の一例

    影山 咲子, 大田 英輝, 外山 由貴, 高浪 健太郎, 平野 泰三, 藤野 直也, 一ノ瀬 正和, 高瀬 圭

    日本インターベンショナルラジオロジー学会雑誌 34 (Suppl.) 396-396 2019/05

    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

  5. 口腔癌多発転移との鑑別を要したメトトレキサート関連リンパ増殖性疾患(MTX-LPD)の1例

    阪本 真弥, 小嶋 郁穂, 飯久保 正弘, 笹野 高嗣, 宮下 仁, 纐纈 衆, 川井 忠, 高橋 哲, 村田 隆紀, 外山 由貴

    歯科放射線 58 (増刊) 46-46 2018/05

    Publisher: (NPO)日本歯科放射線学会

    ISSN: 0389-9705

    eISSN: 2185-6311

  6. 副鼻腔に進展したくも膜嚢胞の1例

    大山 翼, 村田 隆起, 麦倉 俊司, 北見 昌広, 明石 敏昭, 佐藤 志帆, 外山 由貴, Mata-Mbemba Daddy, 李 麗, 田村 元, 高橋 昭喜, 高瀬 圭

    Japanese Journal of Radiology 36 (Suppl.) 3-3 2018/02

    Publisher: (公社)日本医学放射線学会

    ISSN: 1867-1071

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Research Projects 4

  1. Introduction of new renal PET tracer

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2023/04/01 - 2026/03/31

  2. Quantitative MAO-B imaging of human brain and whole-body organs using [18F]SMBT-1 PET

    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

    2021/04/01 - 2025/03/31

  3. Quantitative brain and whole-body MAO-B imaging with [18F]SMBT-1 and PET

    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

    2021/04/01 - 2025/03/31

  4. Metomidateを使った原発性アルドステロン症の新たな診断法の確立

    外山 由貴

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究(B)

    Institution: 東北大学

    2017/04/01 - 2023/03/31

    More details Close

    平成29年度には、代表研究者が4月に横浜で開催された日本医学放射線学会にて「副腎のPET imaging」の教育演題を発表し、優秀演題賞を受賞した。 また、東北大学サイクロトロンラジオアイソトープセンターとの連携のために核薬学研究部の舟木博士と連絡を取り合い、ミーティングを行った。11C- Metomidateの合 成に先駆けて、まずは18F-etomidateの合成を行った。放射性化合物の副腎での分布を調べるために、オートラジオグラフィーの手法を用いた。 18F-etomidateではアルドステロン産生腺腫内部よりも辺縁の付属副腎組織への集積が強いことがわかった。これらの実験 の後、11C-Metomidateの合成を確立した。11C-Metomidateでもヒト副腎腺腫の組織検体を用いてオートラジオグラフィーを行った。11C-Metomidateでも18Fetomidate と同 様にアルドステロン産生 腺腫内部よりも辺縁の付属副腎組織への集積が強いことがわかった。 動物への投与実験を行い、動物用のPET/CTで撮像を行った。平成30年度には11C-Metomidateによる被ばくの影響を調べるために、マウスを用いた体内分布測定を行い、ヒトに換算することで被ばく量の数値を得ることができた。 令和1年から2年は長期出張で、新規実験を行うことはできなかったが、科研費を利用した研究結果を「prognostic value of FDG pet radiomics with machine learning in pancreatic cancer」という題で執筆し、Scientific Reportsに採択された。 令和3年はコロナウイルス感染対策にともなう研究環境の縮小のため、研究の進展はなかった。 第105回みちのく核医学の会に招待され、特別講演を行なった。