PROBLEM TO BE SOLVED: To provide a device for satisfactorily acquiring an optical coefficient of the background of a subject in photoacoustic tomography.SOLUTION: A subject information acquisition device includes an element 203 for receiving an acoustic wave generated when light is irradiated to a subject 204 and outputting an electric signal, and an information acquisition part 208 for acquiring an optical coefficient inside the subject using the electric signal. The information acquisition part generates intensity distribution data corresponding to an initial sound pressure distribution inside the subject using the electric signal and ultrasonic attenuation characteristics of the subject, acquires a plurality of signal intensities according to a light propagation distance inside the subject from the value included in the intensity distribution data, acquires a light quantity distribution inside the subject, and acquires the optical coefficient inside the subject using the plurality of signal intensities and the light quantity distribution.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】光音響トモグラフィーにおいて被検体の背景の光学係数を良好に取得する装置を提供する。【解決手段】被検体204に光が照射されて発生する音響波を受信して電気信号を出力する素子203と、電気信号を用いて被検体内部の光学係数を取得する情報取得部208を有し、情報取得部は、電気信号と被検体の超音波減衰特性とを用いて被検体内部の初期音圧分布に対応する強度分布データを生成し、強度分布データに含まれる値から、被検体内部における光の伝搬距離に応じた複数の信号強度を取得し、被検体内部の光量分布を取得し、複数の信号強度と光量分布を用いて被検体内部の光学係数を取得する。【選択図】図2
