Abstract
To non-invasively identify an unstable plaque using the ultrasonic velocity-change (UVC) method, we examined a method for removing influences of motion such as heartbeat which causes a fluctuation of echo path when applying the UVC method to the living body. In conclusion, by using an M-mode waveform to obtain the UVC data, fat portions in a carotid artery phantom under the pseudo environment of a heartbeat could be identified in a very high success rate and in a short time.
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