| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Research Abstract |
Quantitative measurement of shear wave velocity for living tissue might give valuable information in medical diagnoses. In this report, a novel imaging method based on low frequency vibration wave (LFVW) is proposed.
In order to improve the accuracy, we introduce 3-D Doppler signal acquisition and 3-D LFVW-wave number vector filtering. By this algorithm, propagation characteristics of each LFVW can be evaluated in tissue where standing wave, reflected wave and refracted wave exist at the same time. In order to estimate small displacement of the tissue, we introduce arc-tangent based tissue displacement estimation at the vibration frequency.
Experiments in two-layered phantom show that LFVW velocity can be estimated with standard deviation of less than 5% for the window aperture of 1 cm. It is demonstrated that 500 Hz shear wave is successfully measured for muscle of upper-arm in-vivo.
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