PROBLEM TO BE SOLVED: To provide a photoacoustic imaging apparatus capable of discriminating the presence of a detection object or a tissue of the detection object accurately even if an LED light source part is used.SOLUTION: A photoacoustic imaging apparatus 100 comprises a first LED light source part 3 (4) including a first LED element 30 (40), and a detection part 5. An optical spectrum property has a light intensity peak in a first wave length, which appears when a first current value I1 is supplied to the first LED element 30 (40), and a light intensity peak in a second wave length, which appears when a second current value I2 greater than the first current value I1 is supplied to the first LED element 30 (40). When a half value width D2 of the peak of the second wave length is smaller than a half value width D1 of the peak of the first wave length and the second current value I2 is supplied to the first LED element 30 (40), the presence of a prescribed tissue of a detection object 90a can be discriminated.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2016,JPO&INPIT【課題】LED光源部を用いた場合にも、検出対象物の有無または検出対象物の組織の判別を精度よく行うことが可能な光音響画像化装置を提供する。【解決手段】この光音響画像化装置100は、第1LED素子30(40)を含む第1LED光源部3(4)と、検出部5とを備え、第1LED素子30(40)の光スペクトラム特性は、第1の電流値I1を第1LED素子30(40)に供給した場合に現れる第1の波長における光強度ピークと、第1の電流値I1よりも大きい第2の電流値I2を第1LED素子30(40)に供給した場合に現れる第1の波長とは異なる第2の波長における光強度ピークとを有し、第2の波長のピークの半値幅D2が第1の波長のピークの半値幅D1よりも小さくなり、第2の電流値I2を第1LED素子30(40)に供給した場合に、検出対象物90aの所定組織の有無の判別が可能なように構成されている。【選択図】図2
