PROBLEM TO BE SOLVED: To provide an improvement technology for setting a region of interest on elasticity information.SOLUTION: A displacement measurement unit 30 measures displacement of a tissue in a subject (e.g., in the liver) based on a reception signal acquired from a transmission/reception unit 12, and calculates a displacement vector at a plurality of measurement points in a scan plane. A displacement determination unit 40 determines whether or not the tissue displacement is good at each measurement point based on the displacement vector at the plurality of measurement points. A region-of-interest setting unit 50 sets a region of interest at a position that includes a plurality of measurement points where the tissue displacement is determined to be good.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】弾性情報の関心領域を設定する改良技術を提供する。【解決手段】変位計測部30は、送受信部12から得られる受信信号に基づいて、被検体内(例えば肝臓内)における組織の変位を計測し、走査面内の複数の計測点における変位ベクトルを導出する。変位判定部40は、それら複数の計測点における変位ベクトルに基づいて、各計測点における組織変位が良好か否かを判定する。そして、関心領域設定部50は、組織変位が良好と判定された複数の計測点が含まれる位置に関心領域を設定する。【選択図】図1
