PROBLEM TO BE SOLVED: To provide an image generation device, and an image generation method capable of reconstructing an image representing the information inside a subject to be examined which can suppress image quality deterioration due to noise and inconsistency between a speed used at the image reconstruction and an actual transmission speed.SOLUTION: An image generation device comprises determination means that sets an attention region 5 in a part of a subject to be examined, adjusts a phase of each detection signal based on a distance from each detection element 3 to the attention region 5, and an assumptive speed, performs the processing of calculating a variance in the intensity of a plurality of detection signals whose phase has been adjusted for a plurality of assumptive speeds, and determines the speed whose variance in the intensity is the smallest of the plurality of assumptive speeds as a transmission speed.COPYRIGHT: (C)2014,JPO&INPIT【課題】ノイズおよび画像再構成時に用いた速度と実際の伝播速度との不一致による画質劣化が抑制された、被検体内部の情報を表す画像を再構成することのできる画像生成装置及び画像生成方法を提供する。【解決手段】被検体内の一部分に注目領域5を設定し、各検出素子3から注目領域5までの距離と、仮定の速度とに基づいて各検出信号の位相を調整し、該位相が調整された複数の検出信号の強度のばらつきを算出する処理を、複数の仮定の速度に対して実行し、複数の仮定の速度のうち、強度のばらつきが最小となる速度を伝播速度に決定する決定手段を有することを特徴とする。【選択図】図1
