PROBLEM TO BE SOLVED: To perform preferable image creation in photoacoustic tomography by accurately acquiring sound speed inside a subject.SOLUTION: There is used a subject information acquisition apparatus including: a region setting unit for setting a first region and second region inside a subject a plurality of probes for receiving an acoustic wave transmitted from the subject irradiated with light to output an electric signal a sound speed determination unit for setting a plurality of speeds in each of the first region and second region an imaging processing unit for acquiring, by using an electric signal, an image for each sound speed in the first region and acquiring, by using an electric signal, an image for each sound speed in the second region a feature amount acquisition unit for acquiring, for each sound speed, a comparative feature amount on an overlapped region between the first region and second region and an information acquisition unit for acquiring characteristic information on the subject on the basis of the electric signal, comparative feature amount, and sound speed in the first region and second region.SELECTED DRAWING: Figure 8COPYRIGHT: (C)2016,JPO&INPIT【課題】光音響トモグラフィーにおいて被検体内部の音速を精度良く求めることにより、良好な画像生成を行う。【解決手段】被検体内部で第一領域と第二領域とを設定する領域設定部と、光を照射された被検体から伝播する音響波を受信して電気信号を出力する複数の探触子と、第一領域および第二領域における音速をそれぞれ複数設定する音速決定部と、第一領域の音速ごとに、電気信号を用いて画像を取得し、第二領域の音速ごとに、電気信号を用いて画像を取得する画像化処理部と、音速ごとに、第一領域と第二領域との共通領域に関する比較特徴量を取得する特徴量取得部と、電気信号と、比較特徴量と、第一領域および第二領域の音速に基づいて被検体の特性情報を取得する情報取得部を有する被検体情報取得装置を用いる。【選択図】図8
