Details of the Researcher

PHOTO

Shohei Mori
Section
Graduate School of Engineering
Job title
Assistant Professor
Degree

  • 博士（工学）（東京工業大学）

  • 修士（工学）（東京工業大学）

Committee Memberships 10

  • アコースティックイメージング研究会　幹事補佐

    2023/04 - Present

  • 日本超音波医学会　超音波工学フェロー認定審査委員会委員

    2022/08 - Present

  • 日本音響学会東北支部　庶務幹事

    2022/04 - Present

  • 先端生体超音波シンポジウム　実行委員

    2018/06 - Present

  • 日本超音波医学会 東北地方会　運営事務局

    2018/01 - Present

  • 日本音響学会東北支部　会計幹事

    2020/04 - 2022/03

  • 日本超音波医学会　査読委員・論文賞審査委員

    2018/04 - 2022/03

  • 日本超音波医学会 第93回学術集会プログラム委員会　副委員長

    2018/05 - 2021/01

  • 日本超音波医学会 第93回学術集会　実行委員

    2018/01 - 2021/01

  • 日本超音波医学会 第93回学術集会　運営事務局

    2018/01 - 2021/01

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Professional Memberships 3

  • 日本超音波医学会

  • 日本音響学会

  • IEEE

Research Interests 2

  • 計測工学

  • 超音波医用計測

Research Areas 2

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Measurement engineering /

  • Life sciences / Biomedical engineering /

Awards 12

  1. Best Paper Award of USE 2022

    2023/11　Symposium on Ultrasonic Electronics　Quantification of limitations in statistical analysis of ultrasound echo envelope amplitudes

  2. Outstanding Reviewer Awards 2022

    2023　IOP Publishing

  3. 第28回青葉工学研究奨励賞

    2022/12　一般財団法人青葉工学振興会　超音波エコー信号の振幅確率分布モデルを用いた ロバストな肝線維化構造推定法の開発

  4. The 36th Kikuchi award

    2022/05　Low‑complexity generalized coherence factor estimated from binarized signals in ultrasound beamforming

  5. The 35th Kikuchi award

    2021/05　Discrimination of thoracic spine from muscle based on their difference in ultrasound reflection and scattering characteristics

  6. Best Paper Award of USE2017

    2018/10　Symposium on Ultrasonic Electronics　Quantitative evaluation method for liver fibrosis based on multi-Rayleigh model with estimation of number of tissue components in ultrasound B-mode image

  7. Young Scientist Award

    2018/10　Symposium on Ultrasonic Electronics

  8. 平成29年度電気・情報系若手優秀研究賞

    2018/03　東北大学電気・情報系研究教授会

  9. 粟屋 潔学術奨励賞

    2018/03　日本音響学会

  10. 第17回奨励賞

    2016/05　日本超音波医学会

  11. 第10回学生優秀発表賞

    2015/03　日本音響学会

  12. Poster Session Award, TOIN International Symposium on Biomedical Engineering 2014

    2014/11　TOIN International Symposium on Biomedical Engineering 2014

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Papers 72

  1. Correction to: Modified multi-Rayleigh model-based statistical analysis of ultrasound envelope for quantification of liver steatosis and fibrosis (Journal of Medical Ultrasonics, (2024), 51, 1, (5-16), 10.1007/s10396-023-01354-3)

    Yuki Ujihara, Kazuki Tamura, Shohei Mori, Dar In Tai, Po Hsiang Tsui, Shinnosuke Hirata, Kenji Yoshida, Hitoshi Maruyama, Tadashi Yamaguchi

    Journal of Medical Ultrasonics　51　(3)　555　2024/07

    DOI： 10.1007/s10396-024-01454-8 　

    ISSN： 1346-4523

    eISSN： 1613-2254

  2. Correction: Modified multi-Rayleigh model-based statistical analysis of ultrasound envelope for quantification of liver steatosis and fibrosis.

    Yuki Ujihara, Kazuki Tamura, Shohei Mori, Dar-In Tai, Po-Hsiang Tsui, Shinnosuke Hirata, Kenji Yoshida, Hitoshi Maruyama, Tadashi Yamaguchi

    Journal of medical ultrasonics (2001)　51　(3)　555-555　2024/07

    DOI： 10.1007/s10396-024-01454-8 　

  3. Estimation of red blood cell aggregation size using power spectrum considering density of red blood cells in focal region Peer-reviewed

    Rina Takeyama, Shohei Mori, Nobuo Masauzi, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi KANAI

    Japanese Journal of Applied Physics　2024/05/07

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ad47fe 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract We have studied a noninvasive and quantitative method for measuring the aggregate size of red blood cells (RBCs). In our previous study, the scattering power spectrum obtained from the vascular lumen was fitted to the reference scattering spectra calculated from the scattering spectrum of a single-sphere scatterer. In this paper, we propose a method for calculating the reference scattering spectra by summing the scattering spectra for numerous scatterers in the ultrasound focal region. By applying this method to the size estimation of microparticles simulating RBC aggregates, the estimated sizes are found to be close to the true values. In in vivo measurements, the estimated sizes at rest are equivalent to the size of a single sphere with the same volume as an RBC, and those during avascularization are larger than those at rest, which is reasonable. The proposed method has the potential to accurately estimate the size of RBC aggregates.

  4. Influence of Power-Weighted Center of Echo Signal Within Window Function on Local Strain Rate Distribution in Left Ventricular Wall Peer-reviewed

    Yu Obara, Shohei Mori, Masumi Iwai-Takano, Mototaka Arakawa, Hiroshi Kanai

    Ultrasound in Medicine & Biology　50　(5)　768-774　2024/05

    Publisher: Elsevier BV

    DOI： 10.1016/j.ultrasmedbio.2024.01.014 　

    ISSN： 0301-5629

  5. Appropriate indicator of modeling error for threshold-based model selection in statistics-based ultrasound tissue characterization Peer-reviewed

    Shohei Mori, Mototaka Arakawa, Tadashi Yamaguchi, Hiroshi Kanai, Hiroyuki Hachiya

    Japanese Journal of Applied Physics　63　(5)　05SP03-05SP03　2024/05/01

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ad3653 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract Analysis of the envelope statistics of ultrasound echo signals contributes to quantitative tissue characterization in medical ultrasound. Many probability distribution model functions have been studied, and the model function that should be used for tissue characterization depends on the type of disease, even in the same organ. Thus, an appropriate model selection is important for an accurate diagnosis. In this study, we aimed to select a model using threshold processing for modeling errors instead of a simple selection by minimizing the modeling error. For this purpose, we compared several indicators of modeling errors using random number simulations, ultrasonic simulation, and phantom experiment. The results validated that the Mahalanobis distance of moments is an appropriate indicator because it enables the use of a constant threshold value, regardless of the type of model function and data length.

  6. Method for measuring time waveforms of minute sinusoidal displacements using continuous waves with a network analyzer Peer-reviewed

    Yuya Komatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Japanese Journal of Applied Physics　63　(4)　048003-048003　2024/04/01

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ad3655 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract This study proposes a method for precise measurement of time waveforms of minute sinusoidal displacements using continuous waves. The technique involves measuring the S-parameter of ultrasonic waves reflected from an object undergoing sinusoidal vibration with a network analyzer. When the sinusoidal displacement is not sufficiently small, second-order side peaks emerge in its inverse Fourier transform, alongside the main and first-order side peaks. This method, which incorporates second-order side peaks previously overlooked, enhances the accuracy of measurements. It facilitates precise measurement of sinusoidal displacements ranging from 0.3 to 50 μm at frequencies between 10 and 300 Hz.

  7. A novel ultrasonic method for measuring minute sinusoidal displacement by network analyzer Peer-reviewed

    Yuya Komatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Review of Scientific Instruments　95　(2)　2024/02/01

    Publisher: AIP Publishing

    DOI： 10.1063/5.0177846 　

    ISSN： 0034-6748

    eISSN： 1089-7623

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    We developed a method for generating continuous sinusoidal displacements of an object to estimate viscoelastic parameters. However, the amplitude of the displacement caused by the ultrasonic excitation force under safe guidelines was small (a few micrometers), and it was difficult to stably measure the displacement. Therefore, to stably measure the amplitude of sinusoidal displacement as small as the order of micrometers, we proposed a novel method using a network analyzer. Ultrasonic waves were irradiated using an ultrasonic transducer to an object vibrating sinusoidally. The S parameter of the first reflected wave received from the surface of the object was measured using a network analyzer. The S parameter and the inverse Fourier transform were formulated theoretically, and the amplitude of the sinusoidal displacement of the object was estimated from the amplitude characteristics of the inverse Fourier-transformed signal. The proposed method was applied to measure sinusoidal displacements on the order of micrometers from 10 to 300 Hz on an object using a water tank experiment. The obtained sinusoidal displacement agreed well with the reference values measured using a laser displacement meter. The proposed method can accurately measure minute sinusoidal displacements that occur on an object.

  8. Constant False Alarm Rate Processing Based on Multi-Rayleigh Model for Extraction of Fibrotic Signals in Liver Fibrosis: A Preliminary Study

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Shin Yoshizawa, Hiroyuki Hachiya

    IEEE Ultrasonics, Ferroelectrics, and Frequency Control Joint Symposium, UFFC-JS 2024 - Proceedings　2024

    DOI： 10.1109/UFFC-JS60046.2024.10794108 　

  9. Optimizing irradiation conditions for low-intensity pulsed ultrasound to upregulate endothelial nitric oxide synthase Peer-reviewed

    Daiki Ouchi, Shohei Mori, Mototaka Arakawa, Tomohiko Shindo, Hiroaki Shimokawa, Satoshi Yasuda, Hiroshi Kanai

    Journal of Medical Ultrasonics　51　(1)　39-48　2023/12/05

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10396-023-01382-z 　

    ISSN： 1346-4523

    eISSN： 1613-2254

  10. Estimation error in speed of sound caused by rotation of measured cross-section from short-axis plane of blood vessels: a preliminary study Peer-reviewed

    Shohei Mori, Keiji Onoda, Mototaka Arakawa, Hiroshi Kanai

    Journal of Medical Ultrasonics　51　(1)　49-57　2023/11/30

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10396-023-01383-y 　

    ISSN： 1346-4523

    eISSN： 1613-2254

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    Abstract Purpose Estimating the speed of sound (SoS) in ultrasound propagation media is important for improving the quality of B-mode images and for quantitative tissue characterization. We have been studying a method for estimating the SoS by measuring the reception time distribution of waves scattered from a scatterer at the elements in a probe. Previously, the measurement cross section was assumed to be perpendicular to the long axis of the blood vessel. In this study, we experimentally investigated the relationship between rotation angle $$\theta$$ of the probe relative to the short-axis plane of the blood vessel and the estimated SoS, $$\widehat{c}$$. Methods Water tank and phantom experiments were conducted to investigate the characteristics of $$\widehat{c}$$ and element signals when the probe was rotated. Results The received signal powers at the elements around both edges greatly decreased as $$\theta$$ increased. We introduced a parameter representing the decrease in power, $${P}_{\mathrm{dec } }$$, in the received signal at the elements at both edges relative to the center element. $$\widehat{c}$$ was estimated to be larger as $$\theta$$ increased, especially for $$\theta \ge 30^\circ$$. $${P}_{\mathrm{dec } }$$ also increased as $$\theta$$ increased. An approximately proportional relationship existed between the errors in $$\widehat{c}$$ and $${P}_{\mathrm{dec } }$$. Conclusion Based on these results, we can distinguish between the presence and the absence of SoS misestimations using the difference in power among the elements in the received signal. In the absence of misestimation, we can obtain the true SoS, even if the target has a non-negligible size, by applying our previously proposed methods.

  11. Modified multi-Rayleigh model-based statistical analysis of ultrasound envelope for quantification of liver steatosis and fibrosis Peer-reviewed

    Yuki Ujihara, Kazuki Tamura, Shohei Mori, Dar-In Tai, Po-Hsiang Tsui, Shinnosuke Hirata, Kenji Yoshida, Hitoshi Maruyama, Tadashi Yamaguchi

    Journal of Medical Ultrasonics　51　(1)　5-16　2023/10/05

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10396-023-01354-3 　

    ISSN： 1346-4523

    eISSN： 1613-2254

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    Abstract Purpose Quantitative diagnosis of the degree of fibrosis progression is currently a focus of attention for fatty liver in nonalcoholic steatohepatitis (NASH). However, previous studies have focused on either lipid droplets or fibrotic tissue, and few have reported the evaluation of both in patients whose livers contain adipose and fibrous features. Our aim was to evaluate fibrosis tissue and lipid droplets in the liver. Methods We used an analytical method combining the multi-Rayleigh (MRA) model and a healthy liver structure filter (HLSF) as a technique for statistical analysis of the amplitude envelope to estimate fat and fibrotic volumes in clinical datasets with different degrees of fat and fibrosis progression. Results Fat mass was estimated based on the non-MRA fraction corresponding to the signal characteristics of aggregated lipid droplets. Non-MRA fraction has a positive correlation with fat mass and is effective for detecting moderate and severe fatty livers. Progression of fibrosis was estimated using MRA parameters in combination with the HLSF. The proposed method was used to extract non-healthy areas with characteristics of fibrotic tissue. Fibrosis in early fatty liver suggested the possibility of evaluation. On the other hand, fat was identified as a factor that reduced the accuracy of estimating fibrosis progression in moderate and severe fatty livers. Conclusion The proposed method was used to simultaneously evaluate fat mass and fibrosis progression in early fatty liver, suggesting the possibility of quantitative evaluation for discriminating between lipid droplets and fibrous tissue in the early fatty liver.

  12. Quantification of limitations in statistical analysis of ultrasound echo envelope amplitudes Peer-reviewed

    Shohei Mori, Mototaka Arakawa, Hiroshi Kanai, Hiroyuki Hachiya

    Japanese Journal of Applied Physics　62　(SJ)　SJ1045-SJ1045　2023/04/12

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/acc33e 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract Ultrasound echo envelope statistics have been widely studied for quantitative tissue characterization. In ultrasound measurements, the size of the region-of-interest (ROI) is limited by several factors, such as the locality of the tissue characteristics and the depth dependence of the acoustic field of the ultrasound beam. In this case, the evaluated echo envelope statistics vary even when the envelope amplitudes follow the same population without any noise. In this study, the statistical variance of the moments caused by this finite number of samples was quantified based on the central limit theorem and the law of error propagation. The proposed principles were validated by random number simulation and used to quantify the statistical variance of Nakagami parameter estimation. Finally, the effective number of independent samples in an ultrasonic measurement was quantified based on the relationship between the ROI size and the ultrasound spatial resolution.

  13. Improved robustness of multi-component analysis in amplitude envelope statistics using plane waves Peer-reviewed

    Yuki Ujihara, Kazuki Tamura, Shohei Mori, Shinnosuke Hirata, Kenji Yoshida, Hitoshi Maruyama, Tadashi Yamaguchi

    Japanese Journal of Applied Physics　62　(SJ)　SJ1043-SJ1043　2023/04/11

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/acc749 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract We compared the evaluation accuracy of amplitude envelope statistics under the transmission and reception conditions of compounded plane wave imaging (CPWI) and focused beam imaging (FBI). In a basic study using a homogeneous phantom, we found that the amplitude gradient in the depth direction and the point spread function in the lateral direction spread in the FBI reduced the accuracy of evaluation in amplitude envelope statistics. On the other hand, CPWI showed a more stable evaluation than FBI because of the elimination of sound field characteristics. In CPWI, the multi-Rayleigh model discriminated signals from two types of scatterer with high accuracy in the evaluation using phantoms mimicking fatty liver. It was confirmed that the combination of CPWI and the multi-Rayleigh model is effective for detecting early fatty liver disease. The results show that CPWI is effective for improving the robustness of amplitude envelope statistics.

  14. Ultrasonic measurement of carotid luminal surface roughness with removal of axial displacement caused by blood pulsation Peer-reviewed

    Ryota Yamane, Shohei Mori, Mototaka Arakawa, Jens E. Wilhjelm, Hiroshi Kanai

    Japanese Journal of Applied Physics　62　(SJ)　SJ1042-SJ1042　2023/04/03

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/acc07a 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract For early diagnosis of atherosclerosis, we have developed a method to measure the initial minute surface roughness utilizing the natural longitudinal displacement of the intima-media-complex (IMC) on the carotid artery caused by pulsation. However, the IMC displaces not only in the longitudinal direction but also in the axial direction due to the pulsation. In the present paper, we proposed a novel method to remove the pulsation component by spatially convolving a high-pass filter with the measured depths of IMC in the longitudinal direction. The proposed method was validated by a phantom experiment, and the surface roughness with ten saw teeth was correctly measured. Next, the surface roughness of the carotid artery wall was measured for two healthy volunteers. The proposed method reduced the variation of measured surface roughness among beams compared to the previous method.

  15. High-speed measurement of two-dimensional displacement of myocardium using element RF data of ultrasonic probe Peer-reviewed

    Kaisei Hara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Japanese Journal of Applied Physics　62　(SJ)　SJ1040-SJ1040　2023/03/27

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/acc112 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract Improving the accuracy of heart wall motion measurement is essential to realise better cardiac function evaluation. This paper proposed a two-dimensional (2D) displacement estimation method with a high temporal resolution using the 2D complex cross-correlation of element RF signals of an ultrasonic probe between frames returned from the target scatterers. The application of the proposed method to the phantom displacement confirmed its principle. The estimated 2D displacement of the phantom was consistent with the set displacement. Subsequently, the method was applied to two healthy subjects to measure the 2D displacement of the interventricular septum during one cardiac cycle. Consequently, during systole and diastole, the movement of the myocardium was measured, and the results were validated.

  16. Internal pressure dependence on viscoelasticity of arterial wall by ultrasonic measurement Peer-reviewed

    Saki Suzuki, Shohei Mori, Masumi Iwai-Takano, Mototaka Arakawa, Hiroshi Kanai

    Japanese Journal of Applied Physics　62　(SJ)　SJ1041-SJ1041　2023/03/27

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/acbf5d 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract Previously, we proposed an ultrasonic measurement method of arterial wall elasticity for the early detection of arteriosclerosis. Since vascular wall elasticity depends on blood pressure, in this study, the elasticity and viscosity were estimated using the hysteresis loop determined between the incremental strain in the wall and internal pressure by altering the internal pressure in the phantom and in vivo experiments. Consequently, both the estimated elasticity and viscosity increased with the internal pressure. Moreover, the slope of each hysteresis loop was larger than that of the approximated curve for the lowest blood pressures of the hysteresis loops with different internal pressures, as the blood pressure changed in the order of several hertz within a single heartbeat. Hence, we conclude that measuring both the blood pressure and the elastic and viscous moduli would be beneficial in comprehensively investigating more vessel wall properties that change with the progression of arteriosclerosis.

  17. Ultrasonic measurement of thickness of carotid arterial wall using its natural longitudinal displacement Peer-reviewed

    Yoshifumi Nagai, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Japanese Journal of Applied Physics　62　(SJ)　SJ1039-SJ1039　2023/03/21

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/acba26 　

    ISSN： 0021-4922

    eISSN： 1347-4065

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    Abstract The thickness of the carotid arterial wall obtained from B-mode imaging using ultrasonic diagnostic devices is widely used for the diagnosis of atherosclerosis. However, the measurement interval in the lateral direction of the B-mode image depended on the beam interval (>100 μm). Therefore, the B-mode image is discrete in the lateral direction and cannot reflect changes in local and minute thicknesses. A method for measuring the roughness of the luminal surface of the wall was proposed using the displacement of the carotid arterial wall in the lateral direction during one heartbeat. In this method, the lateral measurement interval is much shorter than the beam interval, enabling a smooth measurement of the luminal surface. By simultaneously applying the method to the lumen-intima and medial-adventitia boundaries of the wall, we propose a novel method to measure the local and minute thicknesses of the carotid arterial wall.

  18. Speed-of-sound estimation in ultrasound propagation medium by considering size of target scatterer Peer-reviewed

    Shohei Mori, Hiroshi Kanai, Mototaka Arakawa

    Journal of Medical Ultrasonics　50　(2)　151-165　2023/03/11

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10396-023-01282-2 　

    ISSN： 1346-4523

    eISSN： 1613-2254

  19. Lateral M-Mode: Ultrasound Visualization of Displacement Along Longitudinal Direction at Intima–Media Complex Peer-reviewed

    Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Ultrasound in Medicine & Biology　49　(3)　875-888　2023/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.ultrasmedbio.2022.11.014 　

    ISSN： 0301-5629

  20. In vivo measurement of attenuation coefficient of blood in a dorsal hand vein in a frequency range of 10–45 MHz: A preliminary study Peer-reviewed

    Mototaka Arakawa, Kyohei Higashiyama, Shohei Mori, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

    Frontiers in Physics　11　2023/02/07

    Publisher: Frontiers Media SA

    DOI： 10.3389/fphy.2023.1077696 　

    eISSN： 2296-424X

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    In this study, the attenuation coefficient of blood was measured in vivo in the frequency range of 10–45 MHz. A procedure to correct the distribution of sound pressure in the measurements was discussed. Further, in vivo measurements were applied on the dorsal hand vein of four healthy subjects at rest and during avascularization. As a preliminary result, less variation of the measured attenuation coefficients was achieved by the proposed method. The comparable results of the inclination of the attenuation coefficients were obtained at rest and during avascularization. Furthermore, the attenuation coefficients during avascularization were markedly higher than those at rest, reflecting the degree of red blood cell aggregation promoted by avascularization. This method may aid in the non-invasive evaluation of blood properties reflecting the degree of red blood cell aggregation.

  21. Application of low-complexity generalized coherence factor to in vivo data Peer-reviewed

    Masanori Hisatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Journal of Medical Ultrasonics　49　(4)　555-567　2022/08/30

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10396-022-01243-1 　

    ISSN： 1346-4523

    eISSN： 1613-2254

  22. Evaluation of local changes in radio-frequency signal waveform and brightness caused by vessel dilatation for ascertaining reliability of elasticity estimation inside heterogeneous plaque: a preliminary study Peer-reviewed

    Yuta Haji, Shohei Mori, Mototaka Arakawa, Toshio Yamagishi, Hiroshi Kanai

    Journal of Medical Ultrasonics　49　(4)　529-543　2022/07/16

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10396-022-01229-z 　

    ISSN： 1346-4523

    eISSN： 1613-2254

  23. Accurate measurement of elasticity of the radial artery wall considering changes in cross-sectional shape of artery caused by pushing pressure applied by ultrasound probe Peer-reviewed

    Yuto Shoji, Shohei Mori, Mototaka Arakawa, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

    Japanese Journal of Applied Physics　61　(SG)　2022/07/01

    DOI： 10.35848/1347-4065/ac4e4a 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  24. Transmission conditions for clear depiction of thoracic spine based on difference between reflection and scattering characteristics of medical ultrasound Peer-reviewed

    Taiga Bando, Shohei Mori, Mototaka Arakawa, Eiko Onishi, Masanori Yamauchi, Hiroshi Kanai

    Japanese Journal of Applied Physics　61　(SG)　2022/07/01

    DOI： 10.35848/1347-4065/ac51c0 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  25. Improving axial resolution of medical ultrasound images by using noise-robust broadband filter based on singular value decomposition Peer-reviewed

    Kenta Kawamata, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Japanese Journal of Applied Physics　61　(SG)　2022/07/01

    DOI： 10.35848/1347-4065/ac5a2c 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  26. Estimation of aggregate size of red blood cell by introducing reference power spectrum measured for hemispherical ultrafine wire Peer-reviewed

    Kyohei Higashiyama, Shohei Mori, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

    Japanese Journal of Applied Physics　61　(SG)　2022/07/01

    DOI： 10.35848/1347-4065/ac4683 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  27. Appropriate Window Function and Window Length in Multifrequency Velocity Estimator for Rapid Motion and Locality of Layered Myocardium. International-journal Peer-reviewed

    Yu Obara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    IEEE transactions on ultrasonics, ferroelectrics, and frequency control　69　(4)　1353-1369　2022/04

    DOI： 10.1109/TUFFC.2022.3153048 　

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    The heart wall has a multilayered structure and moves rapidly during ejection and rapid filling periods. Local strain rate (SR) measurements of each myocardial layer can contribute to accurate and sensitive evaluations of myocardial function. However, ultrasound-based velocity estimators using a single-frequency phase difference cannot realize these measurements owing to insufficient maximum detectable velocity, which is limited by a quadrature frequency. We previously proposed a velocity estimator using multifrequency phase differences to improve the maximum detectable velocity. However, the improvement is affected by a spatial discrete Fourier transform (DFT) window length that represents the locality of the velocity estimation. In this article, we theoretically describe that shortening the window increases the interference between different frequency components and decreases the maximum detectable velocity. The tradeoff between the maximum detectable velocity and the window length was confirmed through simulations and a water-tank experiment. Under the tradeoff, the Hanning window, which was used in previous studies, is not always appropriate for the local measurement of the velocity, which sometimes exceeds 100 mm [Formula: see text] depending on the subject, direction of the ultrasound beam to the heart wall, and cardiac periods. In the in vivo measurement with the short window, the Tukey window with a large flat part that has a high-frequency resolution and ameliorates the discontinuity at both edges of the windowed signal was appropriate to measure the maximum velocity. This study offers the potential for local measurements of each myocardial layer using the multifrequency velocity estimator with the appropriate window function and window length.

  28. 骨と筋組織の超音波の反射特性と散乱特性の差異に基づく胸椎の描出

    横山 智大, 森 翔平, 荒川 元孝, 大西 詠子, 山内 正憲, 金井 浩

    超音波医学　49　(2)　141-149　2022/03

    Publisher: (公社)日本超音波医学会

    ISSN： 1346-1176

    eISSN： 1881-9311

  29. Low-complexity generalized coherence factor estimated from binarized signals in ultrasound beamforming

    Masanori HISATSU, Shohei MORI, Mototaka ARAKAWA, Hiroshi KANAI

    Choonpa Igaku　49　(6)　503-516　2022

    Publisher: Japan Society of Ultrasonics in Medicine

    DOI： 10.3179/jjmu.jjmu.k.27 　

    ISSN： 1346-1176

    eISSN： 1881-9311

  30. A Novel Method for Depicting Thoracic Spine Using Difference Between Scattering of Muscle Tissues and Reflection at Bone Surface

    Mototaka Arakawa, Takumi Hashimoto, Taiga Bando, Shohei Mori, Eiko Onishi, Masanori Yamauchi, Hiroshi Kanai

    2021 IEEE International Ultrasonics Symposium (IUS)　2021/09/11

    Publisher: IEEE

    DOI： 10.1109/ius52206.2021.9593754 　

  31. Study on estimation of speed of sound in propagation medium considering size of target scatterer

    森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電子情報通信学会技術研究報告(Web)　121　(272(US2021 40-46))　2021/09/11

    Publisher: IEEE

    DOI： 10.1109/ius52206.2021.9593638 　

    ISSN： 2432-6380

  32. Strain Rate Distribution in Layered Myocardium Measured Using Local Velocity Estimator with Multifrequency Phase Differences. International-journal Peer-reviewed

    Yu Obara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Ultrasound in medicine & biology　47　(9)　2768-2773　2021/09

    DOI： 10.1016/j.ultrasmedbio.2021.05.021 　

    More details Close

    Measurement of the myocardial strain rate (SR), with high spatial resolution, is useful in evaluation of the transmurality of myocardial infarction. As the SR distribution is calculated using velocities observed at multiple positions in the heart wall, it is necessary to estimate the local velocity to measure SR distribution. In the present study, our previously proposed local velocity estimator, with multifrequency phase differences, was used to measure SR distribution in the heart wall. The SR distribution measured with the proposed local velocity estimator revealed alternate layers of contraction and relaxation, which were not measured with the conventional velocity estimator with spatial averaging. The reproducibility of the SR distributions was confirmed in three consecutive heartbeats with three subjects. High-spatial-resolution SR measurement with the proposed local velocity estimator will allow myocardial layer-specific analysis in the transmural direction.

  33. Accuracy verification in ultrasonic elasticity measurement within intima-media complex visible range using phantom experimental system Peer-reviewed

    Seira Akiyama, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

    DOI： 10.35848/1347-4065/abef0d 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  34. Stabilization of red blood cell aggregation evaluation using short-axis view of vein of ultrasound Peer-reviewed

    Akiyo Fukase, Kyohei Higashiyama, Shohei Mori, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

    JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

    DOI： 10.35848/1347-4065/abf3d5 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  35. A study on differentiation of depiction between scatterer and reflector to assist epidural anesthesia by ultrasound Peer-reviewed

    Takumi Hashimoto, Shohei Mori, Mototaka Arakawa, Eiko Onishi, Masanori Yamauchi, Hiroshi Kanai

    JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

    DOI： 10.35848/1347-4065/abf4a3 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  36. Estimation error in sound velocity depending on size of target scatterer Peer-reviewed

    Aoi Nakayama, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

    DOI： 10.35848/1347-4065/abf39e 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  37. Measurement of propagation of local and minute contractile response in layered myocardium Peer-reviewed

    Yu Obara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

    DOI： 10.35848/1347-4065/abeabf 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  38. Fatty liver evaluation with double-Nakagami model under low-resolution conditions International-coauthorship Peer-reviewed

    Yusuke Sato, Kazuki Tamura, Shohei Mori, Dar-In Tai, Po-Hsiang Tsui, Kenji Yoshida, Shinnosuke Hirata, Hitoshi Maruyama, Tadashi Yamaguchi

    JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

    DOI： 10.35848/1347-4065/abf07d 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  39. Estimation of viscoelasticity of radial artery during flow-mediated dilatation using a single ultrasound probe based on blood pressure measurement via pulse transit time method Peer-reviewed

    Yuto Shoji, Shohei Mori, Mototaka Arakawa, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

    JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

    DOI： 10.35848/1347-4065/abef0b 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  40. Evaluation of error factors depending on ultrasonic transmitted beamwidth in measurement of myocardial minute velocity Peer-reviewed

    Kana Sugahara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    JAPANESE JOURNAL OF APPLIED PHYSICS　60　(SD)　2021/07

    DOI： 10.35848/1347-4065/abef0e 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  41. Low-complexity generalized coherence factor estimated from binarized signals in ultrasound beamforming Peer-reviewed

    Masanori Hisatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Journal of Medical Ultrasonics　48　(3)　259-272　2021/04/22

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10396-021-01089-z 　

    ISSN： 1346-4523

    eISSN： 1613-2254

  42. Multifrequency Phased Tracking Method for Estimating Velocity in Heart Wall. International-journal Peer-reviewed

    Yu Obara, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Ultrasound in medicine & biology　47　(4)　1077-1088　2021/04

    DOI： 10.1016/j.ultrasmedbio.2020.12.011 　

    More details Close

    Local high-accuracy velocity estimation is important for the ultrasound-based evaluation of regional myocardial function. The ultrasound phase difference at the center frequency of the transmitted signal has been conventionally used for velocity estimation. In the conventional method, spatial averaging is necessary owing to the frequency-dependent attenuation and interference of backscattered waves. Here, we propose a method for suppressing these effects using multifrequency phase differences. The resulting improvement in velocity estimation in the heart wall was validated by in vivo experiments. In the conventional method, the velocity waveform exhibits spike-like changes. The velocity waveform estimated using the proposed method did not exhibit such changes. Because the proposed method estimates myocardium velocity without spatial averaging, it can be used for measuring heart wall dynamics involving thickness changes.

  43. Evaluation method of the degree of red blood cell aggregation considering ultrasonic propagation attenuation by analyzing ultrasonic backscattering properties Peer-reviewed

    Kanta Nagasawa, Akiyo Fukase, Shohei Mori, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

    Journal of Medical Ultrasonics　48　(1)　3-12　2021/01/12

    Publisher: Springer Science and Business Media {LLC}

    DOI： 10.1007/s10396-020-01065-z 　

    ISSN： 1346-4523

    eISSN： 1613-2254

  44. Estimation of viscoelasticity of radial artery via simultaneous measurement of changes in pressure and diameter using a single ultrasound probe Peer-reviewed

    Takumi Saito, Shohei Mori, Mototaka Arakawa, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

    Japanese Journal of Applied Physics　59　(SK)　SKKE04-SKKE04　2020/07/01

    DOI： 10.35848/1347-4065/ab7f1c 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  45. Measurement of viscoelasticity of anisotropic viscoelastic phantom by dual ultrasound excitation Peer-reviewed

    Hibiki Kawamura, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Japanese Journal of Applied Physics　59　(SK)　SKKE24-SKKE24　2020/07/01

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ab8bc0 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  46. Generalized coherence factor estimated from real signals in ultrasound beamforming Peer-reviewed

    Masanori Hisatsu, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Journal of Medical Ultrasonics　47　(2)　179-192　2020/04

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s10396-019-01004-7 　

    ISSN： 1346-4523

    eISSN： 1613-2254

    More details Close

    PURPOSE: The generalized coherence factor (GCF), an adaptive beamforming technique, can reduce unnecessary signals from an unfocused position without reducing the contrast-to-noise ratio. However, the computational complexity of this method is large compared to the conventional delay-and-sum (DAS) beamformer. In the present paper, we propose a novel method to achieve the same reduction effect of unnecessary signals with a smaller computational load than that of the conventional GCF approach. METHODS: One of the factors increasing the computational complexity of the GCF-based beamformer compared with DAS is the generation of analytic signals at receiving elements. We clarified the mechanism of generating unnecessary signal components to enable the calculation of the GCF value directly from real signals without generating analytic signals. Furthermore, we proposed a method to filter out these components without generating analytic signals. RESULTS: The GCF values obtained using the proposed and conventional methods were compared and verified using the actual data acquired from a phantom with an ultrasound diagnostic system. We also compared the B-mode images. As a result, equivalent GCF values and similar B-mode image quality were achieved with the proposed method with reduced computational complexity. CONCLUSION: With the proposed method, generation of analytic signals at receiving elements can be omitted, and as a result, the computational load of the GCF method can be greatly reduced, while preserving the effect of reducing unnecessary signals like with the conventional method.

  47. Discrimination of thoracic spine from muscle based on their difference in ultrasound reflection and scattering characteristics Peer-reviewed

    Tomohiro Yokoyama, Shohei Mori, Mototaka Arakawa, Eiko Onishi, Masanori Yamauchi, Hiroshi Kanai

    Journal of Medical Ultrasonics　47　(1)　3-11　2020/01/21

    Publisher: Springer Science and Business Media {LLC}

    DOI： 10.1007/s10396-019-00964-0 　

    More details Close

    PURPOSE: Medical ultrasound is often used to specify the puncture position during epidural anesthesia. However, visualization of the thoracic spine is difficult because of the complex structure, i.e., it is difficult to determine whether the thoracic spine or muscle is depicted. Therefore, this study aims to distinguish bone from muscle tissue using the differences in reflection and scattering characteristics of ultrasound. METHODS: We experimentally investigated the difference in signals received from bone and muscle. We proposed a new parameter utilizing the ratio of the amplitude of the received signals averaged in a wide range around the ideal delay line and that only along the ideal delay line, to emphasize the bone. RESULTS: First, we confirmed the difference in signals received from bone and muscle tissue by basic experiments. We also investigated the difference by in vitro experiments using chicken thigh and in vivo experiments in humans. In both experiments, the proposed method succeeded to clearly depict bone, suppressing the depiction of muscle, compared with conventional B-mode imaging. CONCLUSION: Using the difference in the characteristics of reflection from bone and scattering from muscle tissue, we could distinguish bone from muscle tissue with the proposed method.

  48. Basic Study for Size Estimation of Red Blood Cell Aggregates by Analyzing Ultrasonic Backscattering Properties Considering Ultrasonic Propagation Attenuation

    Mototaka Arakawa, Kanta Nagasawa, Akiyo Fukase, Kyohei Higashiyama, Shohei Mori, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

    PROCEEDINGS OF THE 2020 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)　2020

    ISSN： 1948-5719

  49. Ultrasonic Measurement of Luminal Surface Roughness of Carotid Artery Wall with Removal of Local Displacement Induced by Blood Vessel Pulsation

    Shohei Mori, Takahisa Abe, Mototaka Arakawa, Jens E. Wilhjelm, Hiroshi Kanai

    PROCEEDINGS OF THE 2020 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)　2020

    ISSN： 1948-5719

  50. Measurement of Change in Viscoelasticity of Radial Artery During Flow-Mediated Dilatation Using a Single Ultrasonic Probe

    Yuto Shoji, Takumi Saito, Shohei Mori, Mototaka Arakawa, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

    PROCEEDINGS OF THE 2020 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)　2020

    ISSN： 1948-5719

  51. Accurate Estimation Method of Arterial Wall Movement in Longitudinal Direction

    Koji Iwamori, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    2019 IEEE International Ultrasonics Symposium (IUS)　460-462　2019/10

    DOI： 10.1109/ultsym.2019.8925634 　

    ISSN： 1948-5719

  52. Correlation between Red Blood Cell Aggregation and Blood Glucose Level

    Akiyo Fukase, Kanta Nagasawa, Shohei Mori, Mototaka Arakawa, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

    2019 IEEE International Ultrasonics Symposium (IUS)　45-47　2019/10

    DOI： 10.1109/ultsym.2019.8926267 　

    ISSN： 1948-5719

  53. Speeds of Contraction Responses Propagating along Septum at Pre-ejection Period are Different Between Radial and Longitudinal Directions

    Hiroshi Kanai, Shohei Mori, Mototaka Arakawa

    2019 IEEE International Ultrasonics Symposium (IUS)　1418-1420　2019/10

    DOI： 10.1109/ultsym.2019.8925990 　

    ISSN： 1948-5719

  54. Development of an ultrasonic probe to measure both radial arterial pressure and diameter change at the same position for early diagnosis of vascular endothelial function: Preliminary study Peer-reviewed

    Mototaka Arakawa, Takumi Saito, Shohei Mori, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

    Sensors and Actuators A: Physical　297　111487-111487　2019/10

    Publisher: Elsevier BV

    DOI： 10.1016/j.sna.2019.07.011 　

    ISSN： 0924-4247

  55. A new evaluation method for dependence of width of transmitted waves on accuracy in multipoint simultaneous ultrasonic measurements of cardiac wall vibration waveform Peer-reviewed

    Naoya Furusawa, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Japanese Journal of Applied Physics　58　(SG)　2019/07/01

    DOI： 10.7567/1347-4065/ab1a30 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  56. Local two-dimensional distribution of propagation speed of myocardial contraction for ultrasonic visualization of contraction propagation Peer-reviewed

    Akane Hayashi, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    Japanese Journal of Applied Physics　58　(SG)　2019/07/01

    DOI： 10.7567/1347-4065/ab0d0b 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  57. Spiral Complex Movements of the Heart Wall at the Beginning of Myocardial Contraction Detected by High Frame Speckle Tracking

    Itsuki Kobayashi, Shohei Mori, Mototaka Arakawa, Hiroshi Kanai

    2018 IEEE International Ultrasonics Symposium (IUS)　2018/10

    DOI： 10.1109/ultsym.2018.8579988 　

    ISSN： 1948-5719

  58. Ultrasonically Measured Propagation Speed of Myocardial Contraction Rapidly Decreased in Swine Heart Just After Avascularisation of Coronary Artery

    Akane Hayashi, Shohei Mori, Arakawa Mototaka, Hiroaki Yamamoto, Susumu Morosawa, Hiroaki Shimokawa, Hiroshi Kanai

    2018 IEEE International Ultrasonics Symposium (IUS)　2018-October　2018/10

    Publisher: IEEE

    DOI： 10.1109/ultsym.2018.8579780 　

    ISSN： 1948-5719

    eISSN： 1948-5727

  59. An Ultrasonic Probe to Measure Both Radial Arterial Pressure and Diameter at Identical Position for Early Diagnosis of Arteriosclerosis

    Mototaka Arakawa, Takumi Saito, Shohei Mori, Shigeo Ohba, Kazuto Kobayashi, Hiroshi Kanai

    2018 IEEE International Ultrasonics Symposium (IUS)　2018/10

    DOI： 10.1109/ultsym.2018.8579854 　

    ISSN： 1948-5719

  60. Red Blood Cell Aggregation Measurement with 40- MHz Ultrasound Has a Possibility for Noninvasive Evaluation of Blood Glucose Level in Patients with Diabetes

    Mototaka Arakawa, Hiroki Sakaki, Kanta Nagasawa, Akiyo Fukase, Shohei Mori, Satoshi Yashiro, Yasushi Ishigaki, Hiroshi Kanai

    2018 IEEE International Ultrasonics Symposium (IUS)　2018/10

    DOI： 10.1109/ultsym.2018.8580086 　

    ISSN： 1948-5719

  61. Quantitative Evaluation Method for Liver Fibrosis in Clinical Ultrasound B-Mode Image Based on Optimized Multi-Rayleigh Model

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    2018 IEEE International Ultrasonics Symposium (IUS)　2018/10

    DOI： 10.1109/ultsym.2018.8580078 　

    ISSN： 1948-5719

  62. Examination of optimal moments as input parameters for evaluation of liver fibrosis based on multi-Rayleigh model Peer-reviewed

    Chuang Zhang, Shohei Mori, Shinnosuke Hirata, Hiroyuki Hachiya

    JAPANESE JOURNAL OF APPLIED PHYSICS　57　(7)　07LF27-1-07LF27-7　2018/07/01

    DOI： 10.7567/JJAP.57.07LF27 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  63. Quantitative evaluation method for liver fibrosis based on multi-Rayleigh model with estimation of number of tissue components in ultrasound B-mode image Peer-reviewed

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    Japanese Journal of Applied Physics　57　(7S1)　07LF17-1-07LF17-11　2018/07/01

    Publisher: Japan Society of Applied Physics

    DOI： 10.7567/JJAP.57.07LF17 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  64. Robust analysis method for acoustic properties of biological specimens measured by acoustic microscopy Peer-reviewed

    Mototaka Arakawa, Shohei Mori, Hiroshi Kanai, Ryo Nagaoka, Miki Horie, Kazuto Kobayashi, Yoshifumi Saijo

    Japanese Journal of Applied Physics　57　(7S1)　07LB07-1-07LB07-7　2018/07/01

    Publisher: Japan Society of Applied Physics

    DOI： 10.7567/JJAP.57.07LB07 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  65. Quantitative fibrotic imaging based on multi-Rayleigh model for ultrasound B-mode image of liver fibrosis Peer-reviewed

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    The Journal of the Acoustical Society of America　140　(4)　3247-3247　2016/10

    Publisher: Acoustical Society of America ({ASA})

    DOI： 10.1121/1.4970273 　

  66. Comparison of modeling accuracy of amplitude distribution models for ultrasonic tissue characterization of liver fibrosis

    Shohei Mori, Shinnosuke Hirata, Hiroyuki Hachiya, Tadashi Yamaguchi

    2016 IEEE International Ultrasonics Symposium (IUS)　2016/09

    DOI： 10.1109/ultsym.2016.7728528 　

    ISSN： 1948-5719

  67. Stability evaluation of parameter estimation of multi-Rayleigh model for ultrasound B-mode image of liver fibrosis Peer-reviewed

    Shohei Mori, Minori Ohashi, Shinnosuke Hirata, Hiroyuki Hachiya

    Japanese Journal of Applied Physics　55　(7S1)　07KF09-1-07KF09-6　2016/06

    DOI： 10.7567/jjap.55.07kf09 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  68. Evaluation of fibrotic probability image by multi-Rayleigh model for ultrasound image of liver using automatic region of interest selection

    Shohei Mori, Shinnosuke Hirata, Hiroyuki Hachiya, Tadashi Yamaguchi

    2015 IEEE International Ultrasonics Symposium (IUS)　2015/10

    DOI： 10.1109/ultsym.2015.0406 　

    ISSN： 1948-5719

  69. Probability image of tissue characteristics for liver fibrosis using multi-Rayleigh model with removal of nonspeckle signals Peer-reviewed

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    Japanese Journal of Applied Physics　54　(7S1)　07HF20-1-07HF20-8　2015/06

    DOI： 10.7567/jjap.54.07hf20 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  70. Effect of Non-speckle Echo Signals on Tissue Characteristics for Liver Fibrosis using Probability Density Function of Ultrasonic B-mode image

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    Physics Procedia　70　1173-1176　2015

    DOI： 10.1016/j.phpro.2015.08.252 　

    ISSN： 1875-3892

  71. Effect of beam width on quantitative estimation of liver fibrosis using ultrasonic images Peer-reviewed

    Shohei Mori, Shinnosuke Hirata, Hiroyuki Hachiya

    Japanese Journal of Applied Physics　53　(7S)　07KF23-1-07KF23-5　2014/06

    DOI： 10.7567/jjap.53.07kf23 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  72. Quantitative estimation of liver fibrosis considering effect of resolution of ultrasound in B-mode image

    Shohei Mori, Shinnosuke Hirata, Hiroyuki Hachiya

    Proceedings of Forum Acusticum　2014-　2014

    Publisher: European Acoustics Association, EAA

    ISSN： 2221-3767

Show all ︎Show first 5

Misc. 170

  1. 超音波を用いた生体内音速推定における血管の径と走行角度の影響

    森翔平, 荒川元孝, 金井浩

    超音波Techno　36　(1)　61-66　2024/02

    ISSN： 0916-2410

  2. Basic verification of tissue discrimination ability in the liver in high-frequency multicomponent amplitude envelope characteristics analysis

    白井麻美, ZHANG Tingzhen, 森翔平, 平田慎之介, 吉田憲司, 山口匡

    超音波医学 Supplement　51　2024

    ISSN： 1881-9311

  3. Ultrasound measurement of propagation velocity of myocardial contractile response to electrical excitation with high locality in transmural direction

    小原優, 森翔平, 政氏伸夫, 高野真澄, 高野真澄, 高野真澄, 高野真澄, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　51　2024

    ISSN： 1881-9311

  4. Ultrasonic measurement system of luminal surface roughness on carotid artery for early detection of atherosclerosis

    山根綾太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　51　2024

    ISSN： 1881-9311

  5. Estimation of viscoelastic properties by dual ultrasound excitation and displacement measurement method using network analyzer

    小松祐也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　51　2024

    ISSN： 1881-9311

  6. Examination of envelope statistics analysis of M-mode signals for pneumothorax detection

    森翔平, TRAN Khoa, 荒川元孝, 荒川元孝, 金井浩, 金井浩, 小野雄

    超音波医学 Supplement　51　2024

    ISSN： 1881-9311

  7. Estimation of red blood cell aggregation size using backscattering property from numerous scatterers in focal region

    武山莉奈, 森翔平, 政氏伸夫, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    超音波医学 Supplement　51　2024

    ISSN： 1881-9311

  8. Phantom experiment to investigate relationship among internal pressure, pushing pressure by probe, and tube cross-sectional shape for ultrasound blood pressure measurement

    石川諒, 森翔平, 荒川元孝, 大庭茂男, 小林和人, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2024　2024

    ISSN： 1880-7658

  9. Examination of quantitative evaluation method of lung ultrasound for pneumothorax detection

    森翔平, TRAN Khoa, 荒川元孝, 金井浩, 小野雄

    日本音響学会研究発表会講演論文集(CD-ROM)　2024　2024

    ISSN： 1880-7658

  10. Diagnosis of myocardium properties of cardiac wall

    金井浩, 金井浩, 森翔平, 森翔平, 高野真澄, 高野真澄, 高野真澄, 高野真澄, 政氏伸夫, 荒川元孝, 荒川元孝

    超音波医学 Supplement　51　2024

    ISSN： 1881-9311

  11. Quantitative evaluation method for liver fibrosis by multi-Rayleigh model-based statistical analysis of echo envelope

    森翔平, 平田慎之介, 荒川元孝, 荒川元孝, 山口匡, 金井浩, 金井浩, 蜂屋弘之

    超音波医学 Supplement　51　2024

    ISSN： 1881-9311

  12. Spatial frequency analysis of surface roughness on carotid artery measured by ultrasound

    山根綾太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2023　2023

    ISSN： 1880-7658

  13. Stabilization in measurement of displacement generated by ultrasonic excitation

    小松祐也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2023　2023

    ISSN： 1880-7658

  14. 濃度共起行列によるテクスチャ解析を用いた細胞質内顆粒の自動・定量評価に用いる判別系の検討

    政氏伸夫, 三澤(山本)麻衣, 川崎(菅野)加奈絵, 井田晴日, 中村伊織, 藪田麻結, 黒澤(後藤)美沙紀, 森翔平, 荒川元孝, 荒川元孝, 金井浩

    日本検査血液学会雑誌　24　2023

    ISSN： 1347-2836

  15. 高周波超音波プローブを用いた赤血球集合の評価

    政氏伸夫, 武山莉奈, 森翔平, 荒川元孝, 荒川元孝, 高野真澄, 高野真澄, 八代諭, 石垣泰, 金井浩

    日本検査血液学会雑誌　24　2023

    ISSN： 1347-2836

  16. Variance estimation based on multifrequency phase differences of RF echoes in myocardial strain rate measurement

    小原優, 森翔平, 高野真澄, 高野真澄, 高野真澄, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　50　2023

    ISSN： 1881-9311

  17. In vivo measurement of internal pressure dependence of radial artery viscoelasticity by ultrasound

    鈴木沙綺, 森翔平, 高野真澄, 高野真澄, 高野真澄, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　50　2023

    ISSN： 1881-9311

  18. 過分葉好中球を含む末梢血好中球の自動分類

    政氏伸夫, 井田晴日, 中村伊織, 薮田麻結, 森翔平, 荒川元孝, 金井浩

    臨床血液　64　(5)　2023

    ISSN： 0485-1439

  19. High-speed measurement of two-dimensional displacement of myocardium using received time distribution on elements in ultrasonic probe

    原魁星, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　50　2023

    ISSN： 1881-9311

  20. Investigation of irradiation conditions for low intensity pulsed ultrasound to induce angiogenesis

    大内大輝, 森翔平, 荒川元孝, 荒川元孝, 進藤智彦, 下川宏明, 安田聡, 金井浩, 金井浩

    超音波医学 Supplement　50　2023

    ISSN： 1881-9311

  21. Examination of effect of rotation angle of measured cross-section from short-axis plane of blood vessels on speed-of-sound estimation in liver

    森翔平, 小野田啓司, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2023　2023

    ISSN： 1880-7658

  22. An ultrasonic method for measuring small continuous sinusoidal displacements using a network analyzer

    小松祐也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電子情報通信学会技術研究報告(Web)　123　(214(US2023 37-42))　2023

    ISSN： 2432-6380

  23. What is observed in medical ultrasound images?

    森翔平

    日本音響学会誌　78　(6)　313-321　2022/06

    DOI： 10.20697/jasj.78.6_313 　

    ISSN： 0369-4232

  24. A preliminary study on sound speed estimation for in vivo application

    小野田啓司, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

    ISSN： 1880-7658

  25. Ultrasound measurement of instantaneous displacement using cross-correlation of element signals along ideal delay time

    原魁星, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

    ISSN： 1880-7658

  26. Construction of phantom experimental system simulating in vivo pulsation conditions of carotid artery and evaluation of accuracy of elasticity ultrasound measurement

    鈴木沙綺, 森翔平, 荒川元孝, 高野真澄, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

    ISSN： 1880-7658

  27. A study on transmission conditions of focused waves for thoracic-spine imaging using differences in ultrasonic reflection and scattering characteristics for in vivo application

    阪東泰河, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

    ISSN： 1880-7658

  28. Verification of accuracy of determination of the number of components of echo signal in medium with various types of scatterers

    氏原裕貴, 田村和輝, 森翔平, 平田慎之介, 吉田憲司, 山口匡

    日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

    ISSN： 1880-7658

  29. Viscoelasticity measurement of arterial wall using single probe aimed for evaluating vascular endothelial function

    荒川元孝, 荒川元孝, 庄司悠人, 森翔平, 大庭茂男, 小林和人, 金井浩, 金井浩

    超音波医学 Supplement　49　2022

    ISSN： 1881-9311

  30. Accurate elasticity measurement of radial artery wall considering change in cross-sectional shape of vessel caused by pushing pressure from ultrasound probe

    庄司悠人, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

    超音波医学 Supplement　49　2022

    ISSN： 1881-9311

  31. Red blood cell aggregate size estimation by using reference scattering power spectrum

    東山京平, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    超音波医学 Supplement　49　2022

    ISSN： 1881-9311

  32. Observation of brightness change distributions in carotid plaque to evaluate reliability of measured elastic modulus

    土師佑太, 森翔平, 荒川元孝, 荒川元孝, 山岸俊夫, 金井浩, 金井浩

    超音波医学 Supplement　49　2022

    ISSN： 1881-9311

  33. Individual evaluation of fat and fiber in NASH liver by amplitude envelope statistics analysis

    氏原裕貴, 田村和輝, 森翔平, TAI Dar-In, TSUI Po-Hsiang, 平田慎之介, 吉田憲司, 山口匡

    超音波医学 Supplement　49　2022

    ISSN： 1881-9311

  34. Improving Axial Resolution of Medical Ultrasound Images by Noise-Robust Broadband Filter

    川又健太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　49　2022

    ISSN： 1881-9311

  35. Investigation of improving the accuracy of amplitude envelope statistics by eliminating the transmitting/receiving sound field characteristics

    氏原裕貴, 田村和輝, 森翔平, 平田慎之介, 吉田憲司, 山口匡

    日本音響学会研究発表会講演論文集(CD-ROM)　2022　2022

    ISSN： 1880-7658

  36. 頸動脈の内腔表面粗さ推定のための移動平均による拍動成分推定に関する検討

    山根綾太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2022　2022

  37. 赤血球集合度評価を目指した超音波伝播減衰特性のin vivo計測-生体模擬ファントムの減衰係数計測-

    武山莉奈, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2022　2022

  38. 双方向超音波加振用超音波トランスデューサの加振焦点の特定の検討

    小松祐也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2022　2022

  39. 医用超音波 超音波を用いた動脈壁弾性率計測法のファントム実験による精度検証

    森翔平, 荒川元孝, 金井浩

    超音波Techno　33　(6)　72-77　2021/12

    ISSN： 0916-2410

  40. 公益社団法人日本超音波医学会第 93 回学術集会（仙台 2020）を終えて

    金井浩, 荒川元孝, 森翔平, 冨永佳代

    超音波医学　48　(4)　207-2212　2021/07

  41. Basic study on applicability of amplitude envelope statistical analysis model in clinical echo data of NASH liver

    氏原裕貴, 佐藤悠佑, 田村和輝, 森翔平, TSUI Po-Hsiang, 山口匡

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  42. Conditions for calculating the power spectrum for estimating size of red blood cell aggregate by analyzing ultrasonic backscattering characteristics

    東山京平, 深瀬晶予, 森翔平, 荒川元孝, 八代諭, 石垣泰, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  43. Medical ultrasound can visualize response of myocardium to propagation of electric activation during pre-systole

    金井浩, 荒川元孝, 森翔平

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  44. Measurement of changes in viscoelasticiy of radial artery during flow-mediated dilation using a single ultrasonic probe-Introduction of blood pressure correction based on pulse transit time method-

    庄司悠人, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  45. Filter design considering depth dependence of transfer function in ultrasound measurement system for high resolution observation of myocardial fibers

    川又健太, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  46. Influence of displacement of carotid artery along direction perpendicular to ultrasonic beam and deformation of plaque on ultrasonic elasticity modulus measurement

    土師佑太, 森翔平, 荒川元孝, 山岸俊夫, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  47. Basic study of discrimination evaluation of fibers and fats in organs by amplitude enveloping statistics analysis

    氏原裕貴, 田村和輝, 森翔平, TSUI Po-Hsiang, 平田慎之介, 吉田憲司, 山口匡

    電子情報通信学会技術研究報告(Web)　121　(67(US2021 8-17))　2021

    ISSN： 2432-6380

  48. Myocardial strain rate measured using multifrequency phased-tracking method

    小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　48　2021

    ISSN： 1881-9311

  49. Change in velocity waveform of interventricular septum caused by avascularization of coronary artery

    金井浩, 小原優, 森翔平, 荒川元孝, 山本裕朗, 諸沢薦, 下川宏明, 高野真澄, 高野真澄

    超音波医学 Supplement　48　2021

    ISSN： 1881-9311

  50. Dependence of transmitted beamwidth on ultrasonic measurement of myocardial minute velocity

    菅原佳奈, 原魁星, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　48　2021

    ISSN： 1881-9311

  51. Estimation method of sound velocity distribution in vivo using the delay time distribution of each element of the ultrasonic probe

    中山碧惟, 小野田啓司, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　48　2021

    ISSN： 1881-9311

  52. Observation of brightness distribution of intravenous B-mode image for evaluation of the degree of red blood cell aggregation using ultrasound

    深瀬晶予, 武山莉奈, 東山京平, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    超音波医学 Supplement　48　2021

    ISSN： 1881-9311

  53. Sharp Depiction of Thoracic Spinal Gap Using Difference between Reflection and Scattering Properties of Ultrasound to Assist Epidural Anesthesia

    橋本拓実, 阪東泰河, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

    超音波医学 Supplement　48　2021

    ISSN： 1881-9311

  54. Accuracy verification of elasticity measurement within visible range of intima-media complex

    秋山星来, 鈴木沙綺, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　48　2021

    ISSN： 1881-9311

  55. Verification of relationship between tissue distribution and evaluation parameters in amplitude analysis of NASH liver echoes

    氏原裕貴, 田村和輝, 森翔平, 平田慎之介, 吉田憲司, 山口匡

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  56. A method for estimating degree of red blood cell aggregation by measuring ultrasonic backscattering characteristics-Estimation of scatterer size using power spectrum measured from a point scatterer-

    東山京平, 森翔平, 荒川元孝, 八代諭, 石垣泰, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  57. Relationship between detectable maximum velocity and locality in multifrequency phased-tracking method

    小原優, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  58. A study on transmission conditions of focused waves for thoracic spine imaging using differences in ultrasonic reflection and scattering characteristics

    阪東泰河, 森翔平, 金井浩, 大西詠子, 山内正憲, 荒川元孝

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  59. Design of broadband filter based on singular value decomposition considering depth dependence of transfer function in ultrasound measurement system

    川又健太, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  60. Theoretical study on elasticity measurement of radial arterial wall by considering change in cross-sectional shape of vessel from circular shape caused by pushing pressure of ultrasound probe

    庄司悠人, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2021　2021

    ISSN： 1880-7658

  61. ファントム実験系における超音波による血管壁の粘弾性計測

    鈴木沙綺, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021

  62. 血管新生を誘発する低出力パルス超音波の細胞実験における音場計測

    大内大輝, 森翔平, 荒川元孝, 荒川元孝, 進藤智彦, 安田聡, 下川宏明, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021

  63. 超音波による心筋速度波形計測のための2次元相関を用いた近傍からの成分抑制の検討

    原魁星, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021

  64. 反射体の振幅角度特性におけるディップの形成原因に関する検討

    阪東泰河, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021

  65. 超音波の媒質内伝播時間以外の遅延時間を考慮した生体内音速推定法に関する検討

    小野田啓司, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2021　2021

  66. Simulation verification of amplitude envelope characteristics evaluation using multi-Rayleigh model by amplitude enveloping statistics analysis

    氏原裕貴, 田村和輝, 森翔平, 平田慎之介, 吉田憲司, 山口匡

    電子情報通信学会技術研究報告(Web)　121　(310(US2021 47-57))　2021

    ISSN： 2432-6380

  67. Study About Optimal Condition of Transmitted Ultrasonic Beam for Heart Wall Dynamics Measurement

    森翔平, 荒川元孝, 金井浩

    村田学術振興財団年報　(35)　2021

    ISSN： 0919-3383

  68. 大学教員として働くこと

    森翔平

    日本音響学会誌　77　(1)　96-97　2021/01

  69. Multiple Phased-Tracking for Velocity Estimation of Heart Wall

    小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電子情報通信学会技術研究報告　119　(374(US2019 70-98))　2020

    ISSN： 0913-5685

  70. Evaluation of stability in measurement of red blood cell aggregation using ultrasound

    深瀬晶予, 永澤幹太, 森翔平, 荒川元孝, 八代諭, 石垣泰, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  71. Improvement in measurement of contraction response of heart wall by velocity estimation using ultrasound phase difference

    小原優, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  72. A study on the difference between reflection characteristics of the surface structure and scattering characteristics of the point structure for depiction of surface structure for human thoracic vertebral by ultrasound

    橋本拓実, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  73. Basic study in ultrasonic elasticity measurement of arterial wall using a phantom experimental system

    秋山星来, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  74. Dependence of ultrasonic transmitted beam condition for measurement of myocardial minute velocity

    菅原佳奈, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  75. 双方向超音波加振による音響放射力の音場と対象物表面における変位分布の計測

    福澤徳美, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020

  76. 超音波による計測領域を考慮した頸動脈粥腫部位の弾性率の経時変化解析

    土師佑太, 森翔平, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020

  77. 単一プローブによる橈骨動脈壁粘弾性特性計測のための血圧計測におけるパルス伝播時間法の適用

    庄司悠人, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020

  78. 筋線維の高分解能な超音波観察を目指したWiener filterの設計法の検討

    川又健太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020

  79. 超音波後方散乱特性計測による赤血球集合体サイズ推定時における解析条件の検討

    東山京平, 深瀬晶予, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020

  80. 心筋収縮応答の遅延時間計測の高精度化に関する検討

    荻野智司, 小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2020　2020

  81. A Basic Study on Depiction of Thoracic Spine Based on Difference between Ultrasound Reflection and Scattering Characteristics

    橋本拓実, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

    電子情報通信学会技術研究報告(Web)　120　(174(US2020 27-42))　2020

    ISSN： 2432-6380

  82. Investigation on measurement of myocardial contraction response using multiple-frequency phased-tracking method

    小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電子情報通信学会技術研究報告(Web)　120　(174(US2020 27-42))　2020

    ISSN： 2432-6380

  83. A basic study on application of pulse transit time method to measurement of viscoelastic properties of radial artery with a single ultrasound probe

    庄司悠人, 森翔平, 荒川元孝, 大庭茂男, 小林和人, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  84. Measurements of acoustic field and displacement distribution to estimate anisotropy in viscoelastic properties for an object using dual ultrasound excitation

    福澤徳美, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  85. Study on effect of target scatterer sizes in ultrasonic sound velocity estimation

    中山碧惟, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  86. Examination on transfer function in Wiener filter for high resolution observation of muscle fiber

    川又健太, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  87. Measurable maximal velocity in multiple-frequency phased-tracking for measurement in the heart wall

    小原優, 森翔平, 荒川元孝, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  88. Influence on frequency range in estimation of red blood cell aggregated size by analyzing ultrasonic backscattering characteristics

    東山京平, 深瀬晶予, 森翔平, 荒川元孝, 八代諭, 石垣泰, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  89. Theoretical and experimental investigations on ultrasound reflective properties for depicting bone surface to assist epidural anesthesia

    橋本拓実, 森翔平, 荒川元孝, 大西詠子, 山内正憲, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2020　2020

    ISSN： 1880-7658

  90. 頸動脈に形成された粥腫における同一計測領域での経時的な弾性率変化の超音波計測

    土師佑太, 秋山星来, 森翔平, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

    日本栓子検出と治療学会プログラム・抄録集　23rd　2020

  91. 超音波を用いた赤血球集合の観察における静脈内輝度分布の短軸像による評価

    深瀬晶予, 東山京平, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    日本栓子検出と治療学会プログラム・抄録集　23rd　2020

  92. Multiple Phased-Tracking for Local Velocity Estimation of Heart Wall

    小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  93. Measurements of acoustic field and displacement distribution caused by acoustic radiation force generated by dual ultrasound excitation

    荒川元孝, 荒川元孝, 川村響, 福澤徳美, 森翔平, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  94. Accuracy verification of ultrasonic measurement method of arterial wall elastic modulus

    秋山星来, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  95. Analysis of elasticity change in carotid artery atheroma by ultrasonic measurement

    土師佑太, 秋山星来, 森翔平, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  96. Temporal changes measurements of viscoelastic properties in radial artery wall using a single ultrasonic probe

    庄司悠人, 斎藤拓海, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  97. Accurate estimation of longitudinal movement in carotid arterial wall

    森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  98. Estimation of anisotropic viscoelasticity by dual ultrasound excitation

    福澤徳美, 川村響, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  99. Ultrasonic measurement of luminal surface roughness of carotid artery-Improvement of estimation accuracy of removal pulsation component-

    北爪聡一郎, 木村元幸, 阿部貴久, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  100. Evaluation of stability in measurement of red blood cell aggregation using ultrasound

    深瀬晶予, 永澤幹太, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  101. High resolution observation of striated muscle fiber~wider bandwidth based on Wiener filter~

    川又健太, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  102. Measurement of Attenuation Component by Analyzing Ultrasonic Backscatter for Evaluation of Red Blood Cell Aggregation

    東山京平, 永澤幹太, 深瀬晶予, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  103. Measurement of Ultrasonic Reflection and Scattering Characteristics of Ultrasound for Epidural Anesthesia with Medical Ultrasound

    橋本拓実, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  104. Ultrasonic measurement detects propagation of electrical excitation and difference in propagation velocity of myocardial response in pre-ejection phase for longitudinal and radial components

    金井浩, 金井浩, 森翔平, 荒川元孝, 荒川元孝

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  105. Experimental determination of optimal condition of ultrasonic transmitted beam to measure myocardial minute velocity

    菅原佳奈, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  106. Depiction of thoracic spine based on the difference between ultrasound reflection and scattering characteristics on bone and muscle tissue for epidural anesthesia

    荒川元孝, 荒川元孝, 橋本拓実, 森翔平, 大西詠子, 山内正憲, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  107. Development of generalized coherence factor with reduced computational complexity

    久津将則, 久津将則, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  108. Estimation method of sound velocity distribution in vivo for quantitative fatty liver diagnosis

    中山碧惟, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学 Supplement　47　2020

    ISSN： 1881-9311

  109. 超音波プローブを用いた血圧と血管径の同時計測法に関する検討

    斎藤拓海, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

    圧電材料・デバイスシンポジウム　2019　2019

  110. 超音波計測による頸動脈内腔表面粗さ推定の精度向上に関する検討-拍動成分の除去-

    阿部貴久, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2019　2019

    ISSN： 1880-7658

  111. 単一超音波プローブを用いた血圧-血管径同時計測の再現性に関する検討

    斎藤拓海, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2019　2019

    ISSN： 1880-7658

  112. 超音波後方散乱特性解析による超音波伝搬減衰を考慮した赤血球集合度の評価方法に関する検討

    永澤幹太, 深瀬晶予, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2019　2019

    ISSN： 1880-7658

  113. 双方向超音波加振により発生する変位の計測精度に関する検討

    川村響, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2019　2019

    ISSN： 1880-7658

  114. Improvement in estimation accuracy of luminal surface roughness of carotid artery by ultrasonic measurement-examination on the elimination method of pulsatile components of blood vessel-

    阿部貴久, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電子情報通信学会技術研究報告　119　(211(US2019 46-56))　2019

    ISSN： 0913-5685

  115. 超音波を用いた音速分布推定における散乱体サイズの影響の理論的考察

    中山碧惟, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019

  116. 超音波を用いた赤血球集合観察方法の安定化に関する検討

    深瀬晶予, 永澤幹太, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019

  117. 心臓壁における超音波の位相を用いた微小速度推定

    小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019

  118. 動脈壁弾性率の超音波計測に関する血管模擬ファントムを用いた検討

    秋山星来, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019

  119. 超音波によるヒト胸椎描出を目指した面構造からの受信波形の模擬

    橋本拓実, 森翔平, 荒川元孝, 荒川元孝, 大西詠子, 山内正憲, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2019　2019

  120. 超音波計測を用いた動脈壁の同部位における弾性率変化の経時的観察

    森翔平, 土師佑太, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

    日本栓子検出と治療学会プログラム・抄録集　22nd　2019

  121. 超音波による赤血球集合度と血糖値との相関に関する検討

    深瀬晶予, 永澤幹太, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    日本栓子検出と治療学会プログラム・抄録集　22nd　2019

  122. ヒト心臓壁を対象にした超音波による心筋収縮の伝播速度ベクトルの空間分布推定

    林あかね, 小原優, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学　46　(Supplement (CD-ROM))　2019

    ISSN： 1346-1176

  123. 心臓壁振動速度波形の超音波計測精度の送信ビーム幅依存性評価を目指した基礎検討

    古澤直也, 菅原佳奈, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学　46　(Supplement (CD-ROM))　2019

    ISSN： 1346-1176

  124. 超音波断層像の画質向上と脂肪肝診断を目指した音速分布推定

    阿部啓一郎, 中山碧惟, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学　46　(Supplement (CD-ROM))　2019

    ISSN： 1346-1176

  125. 心臓壁の動態計測における最適な超音波ビーム送信条件の評価

    森翔平, 古澤直也, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学　46　(Supplement (CD-ROM))　2019

    ISSN： 1346-1176

  126. 超音波計測による動脈壁弾性率の経時変化における計測部位の影響

    岩森光司, 秋山星来, 森翔平, 荒川元孝, 荒川元孝, 長谷川英之, 山岸俊夫, 金井浩, 金井浩

    超音波医学　46　(Supplement (CD-ROM))　2019

    ISSN： 1346-1176

  127. 生体組織の微小速度・変形の超音波による高精度な定量評価

    金井浩, 荒川元孝, 森翔平

    超音波医学　46　(Supplement (CD-ROM))　2019

    ISSN： 1346-1176

  128. 超音波計測技術 超音波顕微鏡による生体試料の音響特性の解析方法の検討=ロバストな解析方法を目指して=

    荒川元孝, 森翔平, 金井浩, 堀江みき, 西條芳文, 長岡亮, 小林和人, 小林和人

    超音波Techno　30　(6)　26-32　2018/12

    ISSN： 0916-2410

  129. 種々の加振条件による生体模擬ファントム内を伝搬する横波の計測

    中村健太郎, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2018　2018

    ISSN： 1880-7658

  130. 肝線維化推定のための入力パラメータとして最適な超音波エコー振幅モーメントの検討

    ZHANG Chuang, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2018　2018

    ISSN： 1880-7658

  131. 心臓の高時間分解能超音波計測における送信平面波の有効幅の検討

    古澤直也, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    日本音響学会研究発表会講演論文集(CD-ROM)　2018　2018

    ISSN： 1880-7658

  132. 超音波エコー振幅統計量の統計ゆらぎがマルチレイリーモデルを用いた肝線維化推定に与える影響の検討

    森翔平, 山内優, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2018　2018

    ISSN： 1880-7658

  133. 双方向超音波加振により生体模擬試料表面に発生する変位分布の計測

    川村響, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018

  134. 頸動脈表面粗さの超音波計測における超音波プローブに対する頸動脈の傾斜の影響除去に関する検討

    阿部貴久, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018

  135. 超音波後方散乱特性解析による赤血球集合度評価法の超音波伝播減衰除去に関する検討

    永澤幹太, 森翔平, 荒川元孝, 荒川元孝, 八代諭, 石垣泰, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018

  136. 血管壁粘弾性評価のための単一超音波プローブを用いた橈骨動脈の血管径と血圧の同時計測に関する検討

    斎藤拓海, 森翔平, 荒川元孝, 荒川元孝, 大庭茂男, 小林和人, 金井浩, 金井浩

    電気関係学会東北支部連合大会講演論文集(CD-ROM)　2018　2018

  137. In vivo estimation of sound velocity distribution for diagnosis of fatty liver disease and high resolution of tomographic imaging using ultrasound

    阿部啓一郎, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    電子情報通信学会技術研究報告　118　(229(US2018 49-62))　2018

    ISSN： 0913-5685

  138. 多数点で超音波計測した頸動脈壁振動解析による局所脈波伝播速度の算出

    伊藤未夏, 森翔平, 荒川元孝, 荒川元孝, 金井浩, 金井浩

    超音波医学　45　(Supplement (CD-ROM))　2018

    ISSN： 1346-1176

  139. Relationship of shear wave velocity and excited vibration waveform in tissue mimicking phantom

    長谷川博人, 森翔平, 平田慎之介, 蜂屋弘之

    電子情報通信学会技術研究報告　116　(419(US2016 72-119))　2017

    ISSN： 0913-5685

  140. 超音波エコー振幅統計量に基づく肝線維化定量評価における超音波ビーム幅の影響の検討

    中村健太郎, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  141. 種々の加振手法による横波伝搬波面の観察

    長谷川博人, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  142. 臨床超音波画像を用いた肝線維化定量推定のための最適な入力パラメータの検討

    ZHANG Chuang, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  143. 肝超音波画像のエコー振幅分布を用いた実用的な非スペックル信号除去手法の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  144. 肝線維化定量推定における組織成分数判定手法の検討

    大橋穣, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  145. マルチレイリーモデルに基づく肝線維確率画像に対するスペックル低減手法の影響の検討

    和田淳, 大橋穣, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  146. 臨床応用を考慮した超音波肝画像中の成分数判定によるマルチレイリーモデルに基づく肝線維定量画像の高精度推定

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  147. 粘弾性ファントム内を伝搬する横波の観察

    中村健太郎, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  148. 超音波エコー振幅統計量を用いた肝線維化推定のための入力パラメータと推定精度の関係の検討

    ZHANG Chuang, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2017　2017

    ISSN： 1880-7658

  149. 組織成分を考慮したマルチレイリーモデルに基づく肝線維確率画像の高精度化の検討

    森翔平, 大橋穣, 平田慎之介, 山口匡, 蜂屋弘之

    超音波医学　44　(Supplement (CD-ROM))　2017

    ISSN： 1346-1176

  150. マルチレイリーモデルに基づくExtended-CFAR処理によるびまん性肝疾患の線維抽出手法の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2016　2016

    ISSN： 1880-7658

  151. びまん性肝疾患の組織性状超音波画像のための種々の定量処理手法の比較

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2016　2016

    ISSN： 1880-7658

  152. マルチレイリーモデルに基づく組織性状確率画像による肝超音波画像の線維化定量評価

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    超音波医学　43　2016

    ISSN： 1346-1176

  153. 臨床画像における超音波エコー振幅統計量の分布と肝病変進行度の関係評価

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2016　2016

    ISSN： 1880-7658

  154. 肝組織構造モデルを用いたマルチレイリーモデルに基づく線維抽出手法の評価

    中村健太郎, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2016　2016

    ISSN： 1880-7658

  155. ファントムを用いたせん断波伝搬速度と計測位置の関係の検討

    長谷川博人, 森翔平, 貴志崇之, 山口匡, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2016　2016

    ISSN： 1880-7658

  156. 肝病変進行と超音波画像のエコー振幅統計量分布の関係の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本超音波医学会光超音波画像研究会プログラム・抄録集　2016　(2nd)　2016

  157. 超音波画像を用いた肝炎線維化定量診断手法に関する研究

    森翔平

    立石科学技術振興財団助成研究成果集　(25)　2016

    ISSN： 0918-9939

  158. マルチレイリーモデルの成分数と肝線維抽出画像の関係についての実験的検討

    大橋穣, 森翔平, 平田慎之介, 蜂屋弘之

    日本超音波医学会関東甲信越地方会学術集会抄録集　28th　2016

  159. 超音波エコー信号の振幅分布情報を用いた肝臓内線維化の定量評価手法

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本超音波医学会関東甲信越地方会学術集会抄録集　28th　2016

  160. 臨床画像に含まれる非スペックル成分を考慮した肝線維化定量手法の推定精度の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    超音波医学　43　(5)　2016

    ISSN： 1346-1176

  161. 肝臓組織構造モデルを用いた非スペックル信号除去手法の精度検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2015　2015

    ISSN： 1880-7658

  162. Estimation accuracy of quantitative diagnostic method for liver fibrosis considering nonspeckle signals in ultrasound B-mode image of clinical data

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    電子情報通信学会技術研究報告　115　(102(US2015 16-26))　2015

    ISSN： 0913-5685

  163. 非スペックル成分を含む肝病変組織における線維組織画像化手法の評価

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    超音波医学　42　2015

    ISSN： 1346-1176

  164. マルチレイリーモデルの成分数と肝線維化パラメータ推定精度の関係

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2015　2015

    ISSN： 1880-7658

  165. 肝病変組織構造モデルを用いた肝炎線維組織画像化手法の精度検討

    森翔平, 平田慎之介, 蜂屋弘之

    超音波医学　41　2014

    ISSN： 1346-1176

  166. マルチレイリーモデルに基づく病変肝の線維化定量推定に分解能が与える影響

    森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2014　2014

    ISSN： 1880-7658

  167. 非スペックル成分を除去したマルチレイリーモデルによる肝組織性状確率画像の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2014　2014

    ISSN： 1880-7658

  168. 肝病変超音波画像の振幅確率分布に対するビーム幅の影響評価

    大橋穣, 森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2014　2014

    ISSN： 1880-7658

  169. 肝病変超音波画像を用いた線維組織量評価にビーム幅が与える影響の検討

    森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会研究発表会講演論文集(CD-ROM)　2013　2013

    ISSN： 1880-7658

  170. Simulation for the effect of the beam width on quantitative estimation of liver fibrosis using ultrasonic images

    森翔平, 平田慎之介, 蜂屋弘之

    電子情報通信学会技術研究報告　113　(284(US2013 53-67))　2013

    ISSN： 0913-5685

Show all ︎Show first 5

Presentations 54

  1. Envelope Statistics Analysis of M-mode Signals in Lung Ultrasound for Distinguishing Stratosphere from Seashore Signs

    Shohei Mori, Mototaka Arakawa, Shin Yoshizawa, Sreeraman Rajan, Yuu Ono

    2024 IEEE International Ultrasonics Symposium　2024/09/24

  2. Extraction of Fibrotic Tissues in Liver Using Multi-Rayleigh-Based Constant False Alarm Rate Method for Echo Envelope Statistics

    Shohei Mori, Shinnosuke Hirata, Shin Yoshizawa, Tadashi Yamaguchi, Hiroyuki Hachiya

    2024 IEEE International Ultrasonics Symposium　2024/09/26

  3. マルチレイリーモデルに基づくエコー包絡振幅統計解析による肝線維化の定量評価法 Invited

    森 翔平, 平田慎之介, 荒川元孝, 山口 匡, 金井 浩, 蜂屋弘之

    日本超音波医学会第97回学術集会　2024/06/01

  4. 気胸検出モニタリングに向けた M モード信号の包絡振幅統計解析の基礎検討

    森 翔平, Khoa Tran, 荒川元孝, 金井 浩, 小野 雄

    日本超音波医学会第97回学術集会　2024/06/01

  5. Examination of quantitative evaluation method of lung ultrasound for pneumothorax detection

    森 翔平, Khoa Toran, 荒川元孝, 金井 浩, 小野 雄

    日本音響学会第151回(2024年春季)研究発表会　2024/03/06

  6. 動脈硬化症の極早期診断を目指した頸動脈内腔表面粗さ超音波計測における解析時相の限定法

    森 翔平, 山根綾太, 荒川元孝, 金井 浩

    日本超音波医学会 第67回東北地方会学術集会　2024/03/03

  7. Examination of Envelope Statistics Analysis for M-mode Signals in Lung Ultrasound

    森 翔平, Khoa Toran, 荒川元孝, 金井 浩, 小野 雄

    令和5年度第4回アコースティックイメージング研究会　2023/12/06

  8. 超音波による生体組織性状解析における振幅確率分布モデルの近似精度評価法の比較

    森 翔平, 荒川元孝, 金井 浩, 蜂屋弘之

    第6回東北地区音響学研究会　2023/11/25

  9. Basic examination for selecting probability distribution model in ultrasound tissue characterization

    Shohei Mori, Mototaka Arakawa, Tadashi Yamaguchi, Hiroshi Kanai, Hiroyuki Hachiya

    USE2023 The 44th Symposium on Ultrasonic Electronics　2023/11/13

  10. 超音波を用いた肝臓内音速推定における血管の走行角度の影響に関する基礎検討

    森 翔平, 小野田啓司, 荒川元孝, 金井 浩

    日本音響学会第150回(2023年秋季)研究発表会　2023/09/27

  11. びまん性肝疾患の定量評価のための振幅確率分布モデルの選択法の検討

    森 翔平, 荒川元孝, 山口 匡, 金井 浩, 蜂屋 弘之

    日本超音波医学会 第66回東北地方会学術集会　2023/09/24

  12. High-speed measurement of two-dimensional displacement of heart wall without transmitted beam scanning and received beamforming

    Shohei Mori, Kaisei Hara, Mototaka Arakawa, Hiroshi Kanai

    2023 IEEE International Ultrasonic Symposium　2023/09/04

  13. Medical ultrasound imaging: quantification and visualization of diseases Invited

    Shohei Mori

    IEEE Ottawa Section: Engineering in Medicine and Biology Society, 125th EMBS Seminar Series, 2023　2023/09/01

  14. 頸動脈壁長軸方向変位の超音波による可視化と計測に関する検討

    森 翔平, 荒川元孝, 金井 浩

    令和5年度第2回アコースティックイメージング研究会　2023/08/04

  15. Examination of statistical limitation in statistics evaluation of ultrasound echo envelope amplitudes

    Shohei Mori, Mototaka Arakawa, Hiroshi Kanai, Hiroyuki Hachiya

    USE2022 The 43th Symposium on Ultrasonic Electronics　2022/11/08

  16. Study on estimation of speed of sound in propagation medium considering size of target scatterer

    Shohei Mori, Mototaka Arakawa, Hiroshi Kani

    2021/11/26

  17. Preliminary Study on Estimation of Speed of Sound in Propagation Medium Considering Target Scatterer Size International-presentation

    Shohei Mori, Aoi Nakayama, Keiji Onoda, Mototaka Arakawa, Hiroshi Kanai

    2021 IEEE International Ultrasonics Symposium (IUS)　2021/09/15

  18. Ultrasonic Measurement of Luminal Surface Roughness of Carotid Artery Wall with Removal of Local Displacement Induced by Blood Vessel Pulsation International-presentation International-coauthorship

    Shohei Mori, Takahisa Abe, Mototaka Arakawa, Jens E. Wilhjelm, Hiroshi Kanai

    2020 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)　2020/09/09

  19. 超音波計測を用いた動脈壁の同部位における弾性率変化の経時的観察

    森 翔平, 土師佑太, 荒川元孝, 長谷川英之, 山岸俊夫, 金井 浩

    第22回日本栓子検出と治療学会　2019/10

  20. 心臓壁の動態計測における最適な超音波ビーム送信条件の評価 Invited

    森 翔平, 古澤直也, 荒川元孝, 金井 浩

    日本超音波医学会第92回学術集会　2019/05

  21. 超音波エコー振幅統計量の統計ゆらぎを考慮した肝線維化パラメータ推定の高精度化

    森翔平, 山内優, 平田慎之介, 蜂屋弘之

    第39回超音波エレクトロニクスの基礎と応用に関するシンポジウム　2018/10/31

  22. マルチレイリーモデルを用いた肝線維化定量評価のための実用的な非スペックル信号除去手法

    森翔平, 平田慎之介, 蜂屋弘之

    日本超音波医学会第56回東北地方会　2018/10/14

  23. Quantitative Evaluation Method for Liver Fibrosis in Clinical Ultrasound B-Mode Image Based on Optimized Multi-Rayleigh Model International-presentation

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    2018 IEEE International Ultrasonics Symposium (IUS)　2018/10

  24. 超音波エコー振幅統計量の統計ゆらぎがマルチレイリーモデルを用いた肝線維化推定に与える影響の検討

    森翔平, 山内優, 平田慎之介, 蜂屋弘之

    日本音響学会2018年秋季研究発表会　2018/09/14

  25. 超音波エコー信号を用いた肝臓内線維化の定量評価手法 ーマルチレイリーモデルに基づく臨床画像評価法ー

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    第88回超音波エレクトロニクス研究会　2018/05/31

  26. Quantitative evaluation method of liver fibrosis based on multi-Rayleigh model with number estimation of tissue components in ultrasound B-mode image International-presentation

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    The 38th Symposium on Ultrasonic Electronics　2017/10/25

  27. 臨床応用を考慮した超音波肝画像中の成分数判定によるマルチレイリーモデルに基づく肝線維定量画像の高精度推定

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会2017年秋季研究発表会　2017/09/25

  28. 組織成分を考慮したマルチレイリーモデルに基づく肝線維確率画像の高精度化の検討

    森翔平, 大橋穣, 平田慎之介, 山口匡, 蜂屋弘之

    日本超音波医学会第90回学術集会　2017/05/26

  29. 肝超音波画像のエコー振幅分布を用いた実用的な非スペックル信号除去手法の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会2017年春季研究発表会　2017/03/15

  30. Quantitative fibrotic imaging based on multi-Rayleigh model for ultrasound B-mode image of liver fibrosis International-presentation

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    5th Joint Meeting of the Acoustical Society of America and Acoustical Society of Japan　2016/11/28

  31. 超音波エコー信号の振幅分布情報を用いた肝臓内線維化の定量評価手法

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本超音波医学会第28回関東甲信越地方会学術集会　2016/10/22

  32. Comparison of modeling accuracy of amplitude distribution models for ultrasonic tissue characterization of liver fibrosis International-presentation

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    2016 IEEE International Ultrasonics Symposium　2016/09/18

  33. 臨床画像における超音波エコー振幅統計量の分布と肝病変進行度の関係評価

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会2016年秋季研究発表会　2016/09/14

  34. 肝病変進行と超音波画像のエコー振幅統計量分布の関係の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本超音波医学会基礎技術研究会/日本音響学会アコースティックイメージング研究会　2016/08/06

  35. マルチレイリーモデルに基づく組織性状確率画像による肝超音波画像の線維化定量評価

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本超音波医学会第89回学術集会　2016/05/27

  36. びまん性肝疾患の組織性状超音波画像のための種々の定量処理手法の比較

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会2016年春季研究発表会　2016/03/09

  37. マルチレイリーモデルに基づくExtended-CFAR処理によるびまん性肝疾患の線維抽出手法の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会2016年春季研究発表会　2016/03/09

  38. 超音波画像を用いた肝炎線維化定量診断手法に関する研究

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    第4回次世代がん治療推進専門家養成プランシンポジウム　2016/01/23

  39. Stability evaluation of estimation method of multi-Rayleigh model using simulated ultrasound B-mode image for liver fibrosis International-presentation

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    The 36th Symposium on Ultrasonic Electronics　2015/11/05

  40. Evaluation of fibrotic probability image by multi-Rayleigh model for ultrasound image of liver using automatic region of interest selection International-presentation

    Shohei Mori, Shinnosuke Hirata, Hiroyuki Hachiya, Tadashi Yamaguchi

    2015 IEEE International Ultrasonics Symposium　2015/10/21

  41. マルチレイリーモデルの成分数と肝線維化パラメータ推定精度の関係

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会2015年秋季研究発表会　2015/09/16

  42. 臨床画像に含まれる非スペックル成分を考慮した肝線維化定量手法の推定精度の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    電子情報通信学会/日本音響学会超音波研究会　2015/06/19

  43. 非スペックル成分を含む肝病変組織における線維組織画像化手法の評価

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本超音波医学会第88回学術集会　2015/05/22

  44. Effect of non-speckle echo signals on tissue characteristics for liver fibrosis using probability density function of ultrasonic B-mode image International-presentation

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    2015 International Congress on Ultrasonics　2015/05/10

  45. 肝病変組織構造モデルを用いた非スペックル信号除去手法の精度検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会2015年春季研究発表会　2015/03/16

  46. Probability image of tissue characteristics based on multi-Rayleigh model for liver fibrosis by removing non-speckle signal International-presentation

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    The 35th Symposium on Ultrasonic Electronics, Proceedings of Symposium on Ultrasonic Electronics　2014/12/03

  47. Probability image of tissue characteristics based on multi-Rayleigh model by removing high amplitude non-speckle signal International-presentation

    Shohei Mori, Shinnosuke Hirata, Tadashi Yamaguchi, Hiroyuki Hachiya

    9th TOIN Ineternational Symposium on Biomedical Engineering　2014/11/08

  48. Quantitative estimation of liver fibrosis considering effect of resolution of ultrasound in B-mode image International-presentation

    Shohei Mori, Shinnosuke Hirata, Hiroyuki Hachiya

    7th Forum Acusticum　2014/09/07

  49. 非スペックル成分を除去したマルチレイリーモデルによる肝組織性状確率画像の検討

    森翔平, 平田慎之介, 山口匡, 蜂屋弘之

    日本音響学会2014年秋季研究発表会　2014/09/03

  50. 肝病変組織構造モデルを用いた肝炎線維組織画像化手法の精度検討

    森翔平, 平田慎之介, 蜂屋弘之

    日本超音波医学会第87回学術集会　2014/05/09

  51. マルチレイリーモデルに基づく病変肝の線維化定量推定に分解能が与える影響

    森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会2014年春季研究発表会　2014/03/10

  52. Effect of the ultrasonic beam width for quantitative evaluation of liver fibrosis using ultrasonic images International-presentation

    Shohei Mori, Shinnosuke Hirata, Hiroyuki Hachiya

    The 34th Symposium on Ultrasonic Electronics, Proceedings of Symposium on Ultrasonic Electronics　2013/11/20

  53. 超音波画像を用いた肝線維化の定量推定におけるビーム幅の影響評価シミュレーション

    森翔平, 平田慎之介, 蜂屋弘之

    電子情報通信学会/日本音響学会超音波研究会　2013/11/11

  54. 肝病変超音波画像を用いた線維組織量評価にビーム幅が与える影響の検討

    森翔平, 平田慎之介, 蜂屋弘之

    日本音響学会2013年秋季研究発表会　2013/09/25

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Industrial Property Rights 1

  1. 超音波断層画像の作成方法

    荒川元孝, 金井 浩, 森 翔平, 山内正憲, 大西詠子

    Property Type: Patent

Research Projects 15

  1. Creation of ultrasound pathology based on biological wave physical properties

    Offer Organization: Japan Society for the Promotion of Science

    System: Core-to-Core Program

    Institution: Chiba University

    2024/04 - 2029/03

  2. 超音波画像の振幅統計解析と構造解析に基づくびまん性肝疾患の定量診断法の開発

    森 翔平

    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 - 2027/03

  3. Research on optimization of low-intensity ultrasonic irradiation conditions for ultrasonic therapy to activate self-healing power

    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

    2023/04 - 2026/03

  4. ウェアラブル超音波による気胸検出モニタリング手法の開発

    森 翔平, 小野 雄, 荒川 元孝

    Offer Organization: 公益財団法人 豊田理化学研究所

    System: 2024年度豊田理研スカラー

    2024/04 - 2025/03

  5. Estimation of sound speed distribution in vivo for improvement of ultrasonic image quality and quantitative diagnosis of fatty liver disease

    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

    2021/04/01 - 2024/03/31

  6. A study on measurement method of viscoelastic property of blood vessel wall aiming at early diagnosis of arteriosclerosis

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2021/04 - 2024/03

  7. Ultrasonic visualization of thoracic vertebrae for supporting epidural anesthesia

    Kanai Hiroshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2020/04 - 2023/03

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    In epidural anesthesia, in which an anesthetic needle is inserted into the thoracic space from the skin surface, it is difficult to puncture the appropriate position because the space is narrow and the spinous process extends. In clinical practice, ultrasound is sometimes used to confirm the puncture position, but the visualization of the puncture position is unclear because it is not possible to distinguish between muscle that scatters ultrasound and bone that reflects ultrasound. In the previous research, the influence of the reflected wave from the object was superimposed and the spatial resolution decreased. Therefore, in this research, (1) the difference between scattering and reflection is identified from the amplitude angle characteristics obtained from the instantaneous value of the envelope amplitude of each element, and (2) using the difference in the amplitude angle characteristics of scattering and reflection, The thoracic interspace is sharpened by emphasizing bones.

  8. Early diagnosis of atherosclerosis by accurate ultrasonic measurement of surface roughness of internal elastic membrane

    Kanai Hiroshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    Institution: Tohoku University

    2019/10 - 2022/03

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    We have developed a method to exclude unnatural shapes at both ends of the surface shape measured for each beam by limiting the analysis range to the monotonically increasing part of the lateral displacement when measuring the surface shape for each beam. Furthermore, by interpolating the surface shape measured for each beam for each 1-micron lateral position, the error power is calculated with equal weight at all lateral positions of the surface shape measured for each beam, and the height is adjusted appropriately. We also developed a method. As a result, it became possible to obtain carotid artery surface roughness in vivo by reducing the beam-to-beam variation after adjusting the height of the surface shape measured for every single beam. These results were obtained by referring to Professor Wilhjelm's many years of research.

  9. Ultrasonic visualization of propagation of electrical excitation causing contraction by measuring human myocardial response

    Kanai Hiroshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2019/06 - 2022/03

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    In the early stage of ischemic heart disease, the ischemic region can avoid myocardial necrosis by rapidly reperfusing the coronary arteries. Therefore, rapid identification of the ischemic region is important, and local and highly accurate velocity estimation is the key to the evaluation of local myocardial contraction characteristics using ultrasound. In this study, we analyzed the received ultrasonic signal at multiple frequencies and proposed a speed estimation method using ultrasonic phase differences at multiple different frequencies. This proposed method can reduce the effects of attenuation and interference as described above without performing spatial averaging, and local velocity estimation is possible. The proposed method can estimate the velocity with a shorter window width than the conventional method, and can measure the local velocity distribution and the local myocardial strain rate.

  10. Quantitative evaluation of chronic liver by fusion of viscoelasticity measurement and tissue structure estimation

    MORI Shohei

    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

    2019/04 - 2021/03

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    For a quantitative and early diagnosis of chronic liver disease, we examined a mechanical property measurement method and a tissue structure estimation method of liver tissue. In the mechanical property measurement, a local excitation method was constructed for the local measurement of viscoelasticity. In the estimation of liver tissue structure, the possibility of discrimination of the fibrotic liver tissue and fatty liver tissue based on the analysis of envelope statistics property was evaluated. This study demonstrated the possibility of the simultaneous evaluation of the mechanical property and the morphometric characteristics of liver tissue by ultrasound.

  11. 超音波を用いた心筋動態計測のための最適なビーム送信条件に関する研究 Competitive

    森 翔平, 荒川 元孝, 金井 浩

    Offer Organization: 公益財団法人 村田学術振興財団

    System: 第35回(2019年度)研究助成

    2019/07 - 2020/03

  12. 超音波画像を用いた線維性肝組織構造の高精度推定法に関する研究 Competitive

    森 翔平

    Offer Organization: 一般財団法人 カワイサウンド技術・音楽振興財団

    System: 平成39年度研究助成金【サウンド技術振興部門】

    2018/04 - 2019/03

  13. 強散乱体からの超音波後方散乱波に着目した肝臓内音速推定法に関する研究 Competitive

    森 翔平

    Offer Organization: 公益信託 小野音響学研究助成基金

    System: 平成30年度研究助成

    2018/04 - 2019/03

  14. 超音波画像を用いたびまん性肝疾患の定量診断システムの開発 Competitive

    森 翔平

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    2016/04 - 2018/03

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    平成29年度は，世界的にも先進的な振幅分布関数モデルとして提案されたマルチレイリーモデルを基本として，実際の組織構造が未知の臨床超音波画像に対して肝線維化を高精度に評価する手法を開発した。 マルチレイリーモデルを用いることで，与えられた肝超音波画像から正常組織，線維組織，低エコー組織などの各組織を個別かつ定量的に抽出・可視化できるが，マルチレイリーモデルにより各組織を正しく評価するためには実際の肝組織の構成要素数に合わせた成分数のマルチレイリーモデルを用いる必要がある。しかし，実際の肝組織の構成要素数は肝線維化の進行度や解析領域の位置に応じて変化するため，組織構造が未知の臨床超音波画像に対してマルチレイリーモデルを用いた肝線維化評価を正しく行うためには解析領域内の組織構成要素数をあらかじめ推定する必要がある。 解析領域内の組織の構成要素数を推定するため，マルチレイリーモデル推定の入力値であるエコー振幅統計量に着目した。エコー振幅統計量の分布領域が組織の構成要素数に応じて変化することに着目し，エコー振幅統計量に対する閾値処理で組織の構成要素数を推定する新たな手法を提案した。閾値の決定法としてマハラノビス距離を導入することで，組織の構成要素数を正しく判定する統計的な確率を制御することが可能になり，定量的に組織の構成要素数を推定できた。推定した組織構成要素数に応じた成分数のマルチレイリーモデルを用いることで，実際の組織構造が未知の臨床超音波画像に対して肝線維化を正しく定量的に評価することが可能になった。本成果は，臨床的に十分な精度をもつ定量診断システムを実現する上で重要な成果であり，その意義は学術集会での受賞や学術論文への採択により認められた。

  15. 超音波画像を用いた肝炎線維化定量診断手法の開発 Competitive

    森 翔平

    Offer Organization: 公益財団法人 立石科学技術振興財団

    System: 研究助成（C）

    2015/04 - 2016/03

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Teaching Experience 2

  1. Electric circuit　Tohoku University

  2. Experiment　Tohoku University