| Project/Area Number |
16500325
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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 |
Medical systems
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| Research Institution | KANAGAWA University |
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Principal Investigator |
ENDOH Nobuyuki KANAGAWA University, Department of Engineering, Professor, 工学部, 教授 (20016801)
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| Co-Investigator(Kenkyū-buntansha) |
TSUCHIYA Takenobu KANAGAWA University, Associate Researcher, 工学部, 助手 (50291745)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2004: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Ultrasonic Safety / Sound Projection / Temperature Rise in Tissue / FDTD-HCE Method / Phantom / Acoustic Characteristics / Thermo Couple / 熱電対 / 生体軟部組織 / FDTD / HCE / ファントム / 熱拡散 / 3次元並列計算処理 |
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| Research Abstract |
The higher power ultrasonic equipments are recently extending into not only therapy but also diagnosis because the newer imaging system for diagnosis such as the Doppler color flow imaging and the harmonic imaging require higher ultrasound power than the conventional imaging system.
It is very important to assure the safety of temperature rise caused by absorption of ultrasound energy for new ultrasonic imaging system. We developed the simulation program for the estimation of temperature in tissue radiated by ultrasound. In this two dimensional FDTD-HCE study, temperature rise in tissue has been simulated at focal point radiated by a phased array focused transducer like a common B-mode imagine system. A center frequency of radiated wave pulse is 2.5MHz and ISTPA=0.72W/cm2. When sound pulse repetition frequency (PRF) is changed from 100 to 400kHz, temperature rise in tissue at focal point is proportional to the PRF. Maximum value of temperature rise in tissue is only 0.0004℃ at focal point of transducer when PRF is 400kHz.
Agar phantoms were also produced for the measurement of temperature in it using thermo couples.
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