PROBLEM TO BE SOLVED: To provide a technology for enhancing an image of a tissue of interest in photoacoustic tomography.SOLUTION: A subject information acquisition device is used, including a light source 101 which can radiate at least light of a first wavelength and a second wavelength, a detection part 106 for detecting an acoustic wave generated from a subject to whom the light is radiated from the light source 101 to output an electric signal, a processing part 110 for determining a weighting coefficient corresponding to the concentration of a specific substance of the inside of a subject by using a first signal being an electric signal caused by the light of the first wavelength and a second signal being an electric signal caused by the light of the second wavelength, and weighting the electric signal inputted from the detection part with the weighting coefficient corresponding to the concentration of the specific substance, and a generation part 108 for generating image data showing characteristic information of the inside of the subject on the basis of the weighted electric signal.【課題】光音響トモグラフィーにおいて、関心組織の画像を強調する技術を提供する。【解決手段】少なくとも第１の波長および第２の波長の光を照射可能な光源１０１と、光源１０１から光を照射された被検体から発生する音響波を検出し電気信号を出力する検出部１０６と、第１の波長の光に由来する電気信号である第１信号と、第２の波長の光に由来する電気信号である第２信号と、を用いて被検体内部の特定物質の濃度に応じた重み係数を決定し、特定物質の濃度に応じた重み係数で、検出部から入力された電気信号を重み付けする処理部１１０と、重み付けされた電気信号に基づいて被検体内部の特性情報を示す画像データを生成する生成部１０８を有する被検体情報取得装置を用いる。【選択図】図１
