PROBLEM TO BE SOLVED: To provide an image diagnostic apparatus which stably evaluates left ventricular dyssynchrony and is suitable for predicting an effective case of cardiac resynchronization therapy.SOLUTION: The image diagnostic apparatus, such as an X-ray CT apparatus, an MR apparatus or the like, acquires temporal changes in the myocardial wall thickness at a plurality of local regions of the heart on the basis of time-series images showing the inner structure of the heart of a subject (S5 and S6). The image diagnostic apparatus then calculates, on the basis of the temporal changes in the myocardial wall thickness, an index value reflecting the degree of dispersion of a cardiac phase wherein the size or the change rate of the myocardial wall thickness at the plurality of the local regions fulfills a predetermined condition, for example, becomes maximal (S7 and S9).COPYRIGHT: (C)2012,JPO&INPIT【課題】心臓再同期療法の有効症例の予測に適した、左心室非同期の評価を安定に行うことができる画像診断装置を提供する。【解決手段】X線CT装置やMR装置などの画像診断装置において、被検体の心臓の内部構造を表す時系列的な画像に基づいて、心臓の複数の局所領域における心筋壁厚の時間変化を求め(S5,S6)、この心筋壁厚の時間変化に基づいて、上記複数の局所領域における心筋壁厚の大きさまたは変化速度が所定の条件、例えば最大となる心位相のばらつきの程度が反映された指標値を算出する(S7,S9)。【選択図】図3
