PROBLEM TO BE SOLVED: To accurately determine a local sound velocity even when the sound velocity distribution in a subject is uneven in an azimuth direction.SOLUTION: Ultrasonic diagnostic equipment includes: an ultrasonic probe and a sound velocity value calculation means for calculating a local sound velocity by segmenting a predetermined region in a subject into a plurality of segmented regions. The sound velocity value calculation means includes: a sound velocity setting means for setting an assumed local sound velocity a waveform calculation means for calculating a waveform of an ultrasonic echo on the basis of the assumed local sound velocity and a local sound velocity determination means for determining the local sound velocity on the basis of an actual waveform of the ultrasonic echo and the calculated waveform.COPYRIGHT: (C)2014,JPO&INPIT【課題】検体内の音速分布が方位方向に不均一な場合でも局所音速を精度良く求める。【解決手段】この超音波診断装置は、超音波プローブと、被検体内の所定の領域を複数の分割領域に分割して局所音速を計算する音速値計算手段と、を備え、音速値計算手段は、仮定局所音速を設定する音速設定手段と、仮定局所音速に基づき超音波エコーの波形を計算する波形計算手段と、超音波エコーの実波形と計算された波形とに基づいて局所音速を判定する局所音速判定手段と、を含んで構成される。【選択図】図1
