为了研究不同扫描半径对光声成像的影响,采用了有限扫描角度和滤波反投影算法,得出了吸收体间的距离与探测器旋转扫描半径的比值越大,则成像亮度差异明显,反之则能较好的反映吸收体的光吸收分布,但成像对比度又将下降。采用光声信号衰减补偿的方法,并对前者重建图像取域值,得到了较好的图像质量。该研究结果对光声成像旋转扫描半径的合理选择和成像效果评估具有较好的参考价值。 In order to study the effect of different scanning radii on photoacoustic imaging, finite scanning angle and filtering back-projection algorithm were used. It was found that the larger the ratio of the distance between the absorbing body and the rotating radius of the detector, the obvious difference of the imaging brightness, otherwise Can better reflect the absorption of light absorption distribution, but the imaging contrast will decline. The method of photoacoustic signal attenuation compensation is adopted, and the former is used to reconstruct the image to obtain the better image quality. The results of this study have a good reference value for the reasonable selection of the rotational scanning radius of photoacoustic imaging and the evaluation of imaging effect.