PROBLEM TO BE SOLVED: To provide a technique that achieves a new photoacoustic imaging device excellent in a sound collection performance while using a two-dimensional periodic structure.SOLUTION: A photoacoustic imaging device comprises: a two-dimensional periodic structure 10 having a sound collection effect a detection part for detecting a sound wave transmitted through the two-dimensional periodic structure 10 a drive part for changing a posture of the two-dimensional periodic structure 10 so as to change a sound wave converging direction of the two-dimensional periodic structure 10 with respect to a sound wave transmission direction and an arithmetic control part for generating an imaging image by narrowing down a detection position corresponding to a sound source in a detection area of the detection part by at least using a first detection result detected by the detection part 20 in a first posture of the two-dimensional periodic structure 10, and a second detection result detected by the detection part in a second posture.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】二次元周期構造体を用いつつも集音性能に優れた新たな光音響イメージング装置を実現する手法の提案。【解決手段】集音効果を有する二次元周期構造体10と、二次元周期構造体10を透過した音波を検出する検出部と、音波透過方向に対する二次元周期構造体10の音波収束方向を変化させるように二次元周期構造体10の姿勢を変化させる駆動部と、二次元周期構造体10が第1の姿勢において検出部が検出した第1の検出結果と第2の姿勢において検出部20が検出した第2の検出結果とを少なくとも用いて、検出部の検出領域のうち、音源に対応する検出位置を絞り込んでイメージング画像を生成する演算制御部とを備えた光音響イメージング装置を構成する。【選択図】図1
