論文 - 小寺 紗千子
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SHARM: Segmented Head Anatomical Reference Models 査読あり
E. A. Rashed, M. Al-Shatouri, I. Laakso, S. Kodera, A. Hirata
Biomedical Signal Processing and Control 104 107481 2025年06月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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A novel transfer learning framework for non-uniform conductivity estimation with limited data in personalized brain stimulation 査読あり
Yoshiki Kubota, Sachiko Kodera, Akimasa Hirata
Physics in Medicine & Biology 70 105002 2025年05月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Statistical analysis and machine learning of TMS-induced MEPs for predicting poststroke motor impairment and performance 査読あり 国際共著
Chun-Ren Phang, Shintaro Uehara, Sachiko Kodera, Akiko Yuasa, Shin Kitamura, Yohei Otaka, Akimasa Hirata
Informatics in Medicine Unlocked 55 101643 2025年04月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Recent advances and future perspective in computational bioelectromagnetics for exposure assessments. 査読あり 国際共著 国際誌
Yinliang Diao, Wout Joseph, Dragan Poljak, Luca Giaccone, Sachiko Kodera, Ilkka Laakso, Kenichi Yamazaki, Kun Li, Kensuke Sasaki, Emmeric Tanghe, Mario Cvetković, Walid El Hajj, Takashi Hikage, Fatih Kaburcuk, Gernot Schmid, Anna Šušnjara Nejašmić, Thomas Tarnaud, Vitas Anderson, Kenneth R Foster, Theodoros Samaras, Richard A Tell, Soichi Watanabe, Chung-Kwang Chou, Akimasa Hirata
Bioelectromagnetics 46 ( 3 ) e70002 2025年04月
記述言語：英語 掲載種別：研究論文（学術雑誌）
In the last few decades, extensive efforts have been dedicated to developing computational methods for modeling the interaction of the human body with electromagnetic fields (EMFs). These studies are crucial for the establishment of exposure limits in international standards and guidelines for human protection from EMF, as well as for advancing personalized dosimetry assessment for medical applications using EMF. To summarize the state-of-the-art knowledge in this field, the IEEE International Committee on Electromagnetic Safety (ICES) held an International Workshop on Computational Bioelectromagnetics in February 2024. This review summarizes the technical presentations and discussions from the workshop and was contributed by multiple authors, encompassing topics such as the tissue dielectric property measurement, low-frequency and radio-frequency bioelectromagnetic modeling methods, stochastic modeling in electromagnetic-thermal dosimetry, intercomparison studies, and computational uncertainties. The insights gained from this workshop will guide future research and aid in the development of more accurate and reliable exposure assessment methods.
DOI： 10.1002/bem.70002
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Single exposure to near-threshold 5G millimeter wave modifies restraint stress responses in rats 査読あり
A. Matsumoto, I. Endo, E. Ijima, A. Hirata, S. Kodera, M. Ichiba, M. Tokiya, T. Hikage, and H. Masuda
Environmental Health and Preventive Medicine 2025年04月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Predicting heat-related morbidity in Japan through Integrated meteorological and behavioral factors 査読あり
T. Matsuura, S. Kodera, and A. Hirata
Environmental Challenges 18 101106 2025年04月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Power absorption and temperature rise in deep learning based head models for local radiofrequency exposures 査読あり 国際共著 国際誌
Sachiko Kodera, Reina Yoshida, Essam A Rashed, Yinliang Diao, Hiroyuki Takizawa, Akimasa Hirata
Physics in medicine & biology 2025年02月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP publishing
Abstract
Objective: Computational uncertainty and variability of power absorption and temperature rise in humans for radiofrequency (RF) exposure is a critical factor in ensuring human protection. This aspect has been emphasized as a priority. However, accurately modeling head tissue composition and assigning tissue dielectric and thermal properties remains a challenging task. This study investigated the impact of segmentation-based versus segmentation-free models for assessing localized RF exposure. 
Approach: Two computational head models were compared: one employing traditional tissue segmentation and the other leveraging deep learning to estimate tissue dielectric and thermal properties directly from magnetic resonance images. The finite-difference time-domain method and the bioheat transfer equation was solved to assess temperature rise for local exposure. Inter-subject variability and dosimetric uncertainties were analyzed across multiple frequencies.
Main Results: The comparison between the two methods for head modeling demonstrated strong consistency, with differences in peak temperature rise of 7.6±6.4%. The segmentation-free model showed reduced inter-subject variability, particularly at higher frequencies where superficial heating dominates. The maximum relative standard deviation in the inter-subject variability of heating factor was 15.0% at 3 GHz and decreased with increasing frequencies.
Significance: This study highlights the advantages of segmentation-free deep-learning models for RF dosimetry, particularly in reducing inter-subject variability and improving computational efficiency. While the differences between the two models are relatively small compared to overall dosimetric uncertainty, segmentation-free models offer a promising approach for refining individual-specific exposure assessments. These findings contribute to improving the accuracy and consistency of human protection guidelines against RF electromagnetic field exposure.その他リンク： https://iopscience.iop.org/article/10.1088/1361-6560/adb935/pdf
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高速高精度脳機能イメージングのための脳波電流源推定精度の数値的評価 査読あり
新津 正宗，小寺 紗千子，田中 裕士，阪本 卓也，平田 晃正
電子情報通信学会論文誌C 2025年02月
担当区分：責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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個々人の血流ばらつきを考慮した複合物理解析による知覚温度上昇推定 招待あり 査読あり
新井 紀香，湯浅 明子，上原 信太郎，牛澤 一樹，大高 洋平，Chun Ren Phang，後藤 俊幸，平田 晃正，小寺 紗千子
電子情報通信学会論文誌C 2025年01月
担当区分：最終著者, 責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Estimating the perception threshold of electrostimulation and heating for radiofrequency contact current 査読あり
S. Kodera, S. Kimura, S. Uehara, A. Yuasa, K. Ushizawa, Y. Otaka, A. Hirata
IEEE Transactions on Electromagnetic Compatibility Early access 2024年11月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Assessment of whole-body-average SAR for exposure to electromagnetic fields up to 30 GHz using body model with scaled dielectric parameters 査読あり 国際共著
Y. Diao, S. Kodera, K. Li, and A. Hirata
IEEE Transactions on Electromagnetic Compatibility 2024年11月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Differential impact of SARS-CoV-2 infection during different outbreak periods on incident diabetes in Japan: a matched cohort study utilizing health insurance claims 査読あり
Akiko Matsumoto, Sachiko Kodera, Tatsuya Matsuura, Yoko Takayama, Yuya Yamada, Akimasa Hirata
Environmental Health and Preventive Medicine 2024年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Electric field envelope focality in superficial brain areas with linear alignment montage in temporal interference stimulation 査読あり 国際共著
A. Hirata, Y. Akazawa, S. Kodera, N. Otsuru, I. Laakso
Computers in Biology and Medicine 178 108697 2024年08月
記述言語：英語
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A novel multivariate time series forecasting dendritic neuron model for COVID-19 pandemic transmission tendency 査読あり 国際共著
C. Tang, Y. Todo, S. Kodera, R. Sun, A. Shimada, and A. Hirata
Neural Networks 179 106527 2024年07月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Perceptional Threshold of Electrostimulation and Heating for Intermediate Contact Current 査読あり
A. Hirata, S. Kimura, S. Kodera, S. Uehara, A. Yuasa, K. Ushizawa,Y. Otaka
BioEM 2024 2024年06月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Core temperature rise for whole-body exposure in GHz band at different ambient temperature 査読あり
R. Okuda, S. Kodera, A. Hirata
EMC JAPAN/APEMC OKINAWA 2024年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Estimation of number of heatstroke patients with ambient temperature and solar radiation 査読あり
T. Matsuura, S. Kodera, A. Hirata
EMC JAPAN/APEMC OKINAWA 2024年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Evaluation of absorbed power density for complex surface 査読あり
S. Kodera, K. Kinoshita, A. Hirata
EMC JAPAN/APEMC OKINAWA 2024年05月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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28GHz人体背部ばく露による体温上昇解析 査読あり
木下 晃太朗，増田 宏，小寺 紗千子
電子情報通信学会論文誌Cショートノート 2024年05月
担当区分：最終著者, 責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Core temperature rise for whole-body exposure in GHz band at different ambient temperature
R. Okuda, S. Kodera, A. Hirata
EMC JAPAN/APEMC OKINAWA 2024年05月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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