3J5-2 位相共役法による集束超音波音源の振動解析 : ラム波の影響(医用超音波)

概要

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In HIFU (High Intensity Focused Ultrasound) therapy, ultrasound is focused on target tissue for coagulation. This method is attracting attention as noninvasive therapeutic modality, and being researched widely from basic study to clinical application. Accurate measurement of the ultrasound pressure field is very important in the research areas of HIFU such as biological effects and ultrasound devices. In this study, we reconstructed the distribution of sound source vibration using Time Reversal and investigated the effects of Lamb waves. In the two-dimensional Fourier transform of the sound source vibration in both time and space domain, we found a peak with a finite phase velocity, which may corresponds to Lamb waves propagating from the edge toward the center of the circular transducer.
2009-11-18