Curriculum Vitaes
Profile Information
- Affiliation
- Associate Professor, Faculty of Science and Technology, Department of Information and Communication Sciences, Sophia University
- Degree
- 博士（工学）(上智大学)
- Contact information
- c-sumi
sophia.ac.jp - Researcher number
- 40306981
- J-GLOBAL ID
- 200901046988366038
- researchmap Member ID
- 1000260134
- External link
Chikayoshi Sumi received the B.E, M.E., and D.E. degrees from the Department of Electrical and Electronics Engineering, Sophia University, Tokyo, Japan, in 1991, 1993, and 1996, respectively. From 1996 to 1998, he was a research fellow of the Japan Society for the Promotion of Science and a research associate at Sophia University. In 1997, he was with the Bioacoustics Research Laboratory at the University of Illinois at Urbana-Champaign as a visiting scholar. He started to work at Sophia University as a lecturer, and he currently is an associate professor at the Department of Information and Communication Sciences. His research interests include medical ultrasound, elasticity imaging, non- invasive treatment, biological signal processing, and inverse problems etc. He is a senior member of the IEEE, and members of the Japan Society of Ultrasonics in Medicine, the Japan Society of Medical Electronics and Biological Engineering, the Institute of Electronics, Information and Communications Engineers of Japan, and the Institute of Electrical Engineers of Japan. He currently is editorial boards of Journal of Reports in Medical Imaging, Journal of Medical Engineering, and International Journal of Biomedical Imaging.
(Subject of research)
Differential Diagnosis of cancer by measurement of elastic and visco-elastic modulus from ultrasonic and MR strain measurements
Measurement of electromagnetic parameter distribution from magnetic field measurements (MR, SQUID etc)
Reconstruction of thermal parameter distribution from temperature measurement (MR, infra-red, ultrasound, pyroelectricity etc.)
Thermal treatment of cancer utilizing HIFU(High Intensity Focus Ultrasound) and electromagnetic wave
(Proposed theme of joint or funded research)
Measurement of elastic and visco-elastic modulus distribution in soft tissue from ultrasonic, MR and OCT strain measurements
Measurement of electromagnetic parameter distribution from magnetic field measurement(MR, SQUID etc.)
Measurement of thermal parameter distribution from temperature measurement (infra-red, MR, ultrasound)
Research Interests
21Research Areas
7Research History
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Apr, 2008 - Present
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Apr, 1998 - Mar, 2008
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Apr, 1996 - Mar, 1998
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Jan, 1996 - Mar, 1998
Education
3Committee Memberships
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2022 - Present
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Jul, 2016 - Present
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Apr, 2017 - Feb, 2021
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Sep, 2013 - 2021
Awards
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1993
Papers
514-
2000(2) 1085-1086, Sep, 2000
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Journal of the Visualization Society of Japan, 20(1Supplement) 179-180, Jul, 2000
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Abstracts of the 22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, WE-B328-5, Jul, 2000
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研究部会資料(平成12年度日本音響学会アュースティックイメジング研究会), AI2000(1) 47-50, Jun, 2000
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Physics in Medicine and Biology, 45(6) 1511-1520, Jun, 2000
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Measurement science & technology, 11(6) 795-800, Jun, 2000
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Japanese journal of medical electronics and biological engineering : JJME, 38(Supplement) 284, May, 2000
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Japanese journal of medical electronics and biological engineering : JJME, 38(Supplement) 105, May, 2000
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Japanese journal of medical electronics and biological engineering : JJME, 38(Supplement) 287, May, 2000
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Journal of medical ultrasonics, 27(4) 701, Apr, 2000
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Journal of medical ultrasonics, 27(4) 707, Apr, 2000
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Proceeding of the 11th International Conference on Mechanics in Medicine and Biology, 207-210, 2000
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Abstracts of the 8th International Congress of Hyperthermic Oncology, 191, 2000
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Abstracts of the 22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Tu-G326-1, 2000
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Proc. of the European Medical & Biological Engineering Conference EMBEC ’99, 946-947, Nov, 1999
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[Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999. Proceedings of the First Joint, 1 511, Oct, 1999
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1999 IEEE Ultrasonics Symposium, proceedings : October 17-20, 1999, Caesars Tahoe, Nevada, U.S.A., 2 1653-1656, Oct, 1999
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Journal of the Visualization Society of Japan, 19(1) 151-152, Jul, 1999We have developed the ultrasonic (US) strain measurement-based elasticity computed tomography for diagnosis of soft tissues. Specifically, we developed the iterative rf-echo phase matching method that provides us considerably accurate estimates of strains generated in vivo in soft tissues due to spontaneous heart motion/extracorporeally applied pressures. Moreover, we have developed a numerical method for stably reconstructing the relative shear modulus distribution with respect to reference shear moduli only from the measured strain data. We also developed the proper configuration method of mechanical sources/reference regions for stably reconstructing it. Since we could verify the feasibility of each method through simulations, and phantom experiments etc, we here focused our attention on application to breast tissues, and unified the methods into a technique by conducting experiments using in vitro pork rib. Finally, we showed a sample shear modulus image obtained on the breast tissue of a healthy volunteer.
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Abstracts Book of 11th International Congress on the Ultrasonic Examination of the Breast, 377, May, 1999
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Japanese journal of medical electronics and biological engineering : JJME, 37(Supplement) 304, Apr, 1999
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Journal of medical ultrasonics, 26(4) 675, Apr, 1999
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1999(1) 1123-1124, Mar, 1999
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Proceedings of the European medical and biological engineering conference '99 (part II), 31(27) 944-945, 1999
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Proceedings of the 4th Asia-Pacific Conference on Medical and Biological Engineering, 186, 1999
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Proceedings of the First Joint [Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999., 496, 1999
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IEEE Trans. on Ultrason., Ferroelect., Freq. Contr., 46(1) 158-166, Jan, 1999
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IEEE Trans. on Medical Imaging, 17(3) 419-428, Jun, 1998
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Japanese journal of medical electronics and biological engineering : JJME, 36(Supplement) 347, May, 1998
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Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1998., 2 826-829, 1998
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Proceedings, 2 1521-1526, Oct, 1997
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Abstracts of 1997 World Congress on Medical Physics and Biological Engineering, 397, Sep, 1997
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Japanese journal of medical electronics and biological engineering : JJME, 35(Supplement) 171, Apr, 1997
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Journal of medical ultrasonics, 24(3) 574-574, Mar, 1997
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Proc. of 1997 World congress on medical Physics and biological engineering, 398, 1997
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Proceedings, 2 1325-1329, Nov, 1996
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Journal of medical ultrasonics, 23(Supplement II) S0285, Nov, 1996
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Journal of Applied Physics, 80(1) 1-7, Jul, 1996
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Journal of medical ultrasonics, 23(Supplement I) S0357, Jun, 1996
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Journal of medical ultrasonics, 23(Supplement I) S0291, Jun, 1996
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Japanese journal of medical electronics and biological engineering : JJME, 34(Supplement) 107-107, May, 1996
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IEICE transactions on fundamentals of electronics, communications and computer sciences, E78-A(12) 1655-1664, Dec, 1995In order to estimate elasticity distribution of living soft tissue by ultrasonic pulse-echo method, we developed an algorithm by which we estimate 2-D displacement vector field from two successive rf echo data frames. The algorithm estimates a displacement vector iteratively by matching the phase characteristics of the local regions of two data frames. The estimation process is composed of coarse one and the fine one. In the coarse estimation process, the displacement is estimated by detecting the peak of the 2-D cross-correlation function. In the fine process, the displacement is estimated iteratively by shifting the 2nd frame data so that the phase characteristics matches with that of the 1st frame data. In each iterative step of both processes, the estimated displacement vector field is spatially smoothed. This proposed algorithm exhibits excellent performance in obtaining accurate and smooth distribution of displacement vector which is required to obtain strain distribution and finally shear modulus distribution. We conducted an experiment on an agar phantom which has inhomogeneous shear modulus distribution. Using the proposed method, we obtained 2-D displacement field with reasonable accuracy. We reconstructed a relative shear modulus map using axial strain assuming 1-D stress condition. The reconstructed map using the calculated axial strain through 2-D displacement estimation algorithm was satisfactory, and was clearly superior to the one through 1-D displacement estimation algorithm. The proposed 2-D displacement field estimation algorithm seems to be a versatile and powerful tool to measure strain distribution for the purpose of tissue elasticity estimation under various deformation conditions.
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Journal of medical ultrasonics, 22(Supplement II) S0258, Nov, 1995
Books and Other Publications
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InTech, Apr, 2011 (ISBN: 9789533072395)
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Springer, Aug, 2009 (ISBN: 9781402088223)
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Springer, Aug, 2009 (ISBN: 9781402088223)
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Biomagnetism: Transdisciplinary Research and Exploration, Aug, 2008
Professional Memberships
20Research Projects
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第41回（2025年度）研究助成, 公益財団法人村田学術振興・教育財団, Jul, 2025 - Jun, 2026
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2024 年度（令和６年度）「区分（1）精密測定技術振興のための調査・研究事業」, 公益財団法人精密測定技術振興財団, Jan, 2025 - Mar, 2026
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2025年度研究者海外研修助成, 公益財団法人スズキ財団, Dec, 2025 - Dec, 2025
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2022年度後期分 区分(3) 国際交流等研究促進事業に対する助成（A）海外渡航事業, 公益財団法人 精密測定技術振興財団研究助成, Oct, 2022 - Oct, 2022
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研究助成 2019年度後期分 区分(3) 精密測定技術向上のための国際交流等研究促進事業 (A)海外渡航事業, 公益財団法人 精密測定技術振興財団, Oct, 2019 - Oct, 2019
Social Activities
19Other
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Apr, 1998情報理工学科や電気電子工学科の担当科目を中心に、学生の教育に専念し、技術者・科学者・教育者の育成に取り組んでいる(電磁気測定、可視化情報学、生体医工学、基礎物理学、医用画像工学など)。講義中には、技術内容や現象に関して自分で考える時間を設け、また、演習やレポートの課題を課すことで技術者や科学者としてのセンスを磨く機会を設けると共に、学生の理解度を確認している。
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Apr, 1998研究室輪講やゼミ、卒業研究を実施する中で、技術者・科学者・教育者としてのセンスの向上を図っている。内容としては、一つの目的を達するための、理論構築、シミュレーション、実験（実験系や装置開発を含む）という一連の流れを経験できるテーマに取り組んで貰っている。また、常に、他研究グループの研究動向の確認をさせる様にしている。