PROBLEM TO BE SOLVED: To provide an optical acoustic device that can measure the living body characteristic distribution in a deep part of a subject, create image data easy to understand the relationship with the position of a blood vessel, and reduce the impact of the deviation of a measuring position.SOLUTION: The optical acoustic device includes: a light source capable of separately irradiating light of a first wavelength in which absorption coefficients of oxyhemoglobin and deoxyhemoglobin are the same, and light of a second wavelength which is different from the first wavelength； an acoustic detector that receives an acoustic wave generated when the light is absorbed by the subject and converts it to an electric signal for each of the light of the first and second wavelengths； an absorption coefficient distribution creation part for acquiring an absorption coefficient distribution inside the subject using an electric signal； a blood vessel position specification part for specifying a blood vessel position from the absorption coefficient distribution of the first wavelength； a living body characteristic distribution creation part for acquiring a living body characteristic distribution from the absorption coefficient distribution of the light of the first and second wavelengths； and a trimming part for trimming the living body characteristic distribution according to the specified blood vessel position.SELECTED DRAWING: Figure 1【課題】被検体の深部の生体特性分布を測定し、血管の位置との関係を理解しやすい画像データを生成するとともに、測定位置のずれの影響を減少させることが可能な光音響装置を提供する。【解決手段】オキシヘモグロビンとデオキシヘモグロビンの吸収係数が等しい第１の波長の光と、第１の波長と異なる第２の波長の光を個別に照射可能な光源と、第１および第２の波長の光のそれぞれについて、光が被検体に吸収されて発生する音響波を受信し電気信号に変換する音響検出器と、電気信号を用いて、被検体内部の吸収係数分布を求める吸収係数分布生成部と、第１の波長の吸収係数分布から血管位置を特定する血管位置特定部と、第１および第２の波長の光の吸収係数分布から生体特性分布を求める生体特性分布生成部と、特定された血管位置により生体特性分布をトリミングするトリミング部を有する光音響装置を用いる。【選択図】図１
