PROBLEM TO BE SOLVED: To provide a method and a device for satisfactorily acquiring a value necessary for obtaining a light quantity distribution inside a subject in photoacoustic tomography.SOLUTION: A subject information acquisition device includes an element 202 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 characteristic information 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, acquires a plurality of representative values according to a light propagation distance inside the subject from the value included in the intensity distribution data, and acquires an equivalent damping coefficient of the inside of the subject based on the plurality of representative values.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】光音響トモグラフィーにおいて、被検体内部の光量分布を求めるために必要な値を良好に取得する方法および装置を提供する。【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202と、電気信号を用いて、被検体内部の特性情報を取得する情報取得部208を有し、情報取得部は、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代表値を取得し、複数の代表値に基づいて被検体内部の等価減衰係数を取得する。【選択図】図2
