| Project/Area Number |
07650471
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
計測・制御工学
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| Research Institution | CHIBA UNIVERSITY |
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Principal Investigator |
HACHIYA Hiroyuki Chiba University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (90156349)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1995: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | medical ultrasonics / living tissue / sound speed / sound attenuation / measurement method / 減速 / 組織鑑別診断 / 肝硬変 / Bモード画像 / 散乱体分布 |
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| Research Abstract |
The acoustic characteristics in biological tissues provide important diagnostic and treatment planning information. Conventional methods of sound speed determination generally require that transducers make physical contact with specimens in order to measure thickness and ultrasonic signal in the time domain. A method for determination of the sound speed and attenuation is proposed in which the sound travel time in the sample and the difference in total signal from the transducer to the rigid reflector due to the presence of the sample are estimated in the frequency domain and which does not require physical contact of ultrasonic probes to living or freshly excised tissue specimens. Using this method, the sound speeds and attenuation of human heart tissues are measured precisely. The speed and attenuation of sound in normal hearts varied minimally between individuals and was not related to body weight or age. Change of sound speed and attenuation of heart tissues was associated with histological change of a heart. Ultrasonic speed and attenuation measurements in tissues verified the method validity in medical application.
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