PROBLEM TO BE SOLVED: To discern region of a peripheral part of an object, and to secure quantitative property in measurement in an optoacoustic imaging apparatus which holds the object using a holding plate.SOLUTION: An object information acquiring apparatus includes: the holding plate which holds the object a probe which detects an acoustic wave propagated from the inside of the object irradiated with measurement light and converts the acoustic wave into an electric signal an image processor which generates an image inside the object from the electric signal a photodetector which detects light reflected by the peripheral part as a region that does not come into contact with the holding plate in the object and a discerning means which discerns a contact state between the holding plate and the object using a detection result of the photodetector.COPYRIGHT: (C)2013,JPO&INPIT【課題】保持板により被検体を保持する光音響撮像装置において、被検体周縁部の領域を識別し、測定の定量性を確保する。【解決手段】被検体を保持する保持板と、計測光を照射された被検体内から伝播する音響波を検出して電気信号に変換する探触子と、電気信号から被検体内の画像を生成する画像処理手段と、被検体のうち保持板と接触していない領域である周縁部に起因する光を検知する光検知手段と、光検知手段の検知結果を用いて、保持板と被検体の接触状態を識別する識別手段を有する被検体情報取得装置を用いる。【選択図】図1
