为了研究不同探测距离对光声成像的影响, 采用了线性扫描和滤波反投影算法, 得出了吸收体间距相对探测距离越大, 则成像亮度差异明显, 吸收体远离探测器, 则重建图像变形很明显。采用了光声信号衰减补偿的方法, 对前者重建图像取域值, 对后者采用旋转扫描重建, 均得到了较好的图像质量。该研究结果对光声成像探测距离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 influence of differential detected distance on photoacoustic imaging, numerical experiments of linear scanning and filter back-projection algorithm were carried out. The results of simulations showed that the lightness of imagines were different when distance of absorbers relative to detected distance increased, and reconstructed image distortion was severe when the transducer was far from absorbers. The method of photoacoustic signal attenuation compensation was adopted; a good quality of reconstructed imaging was obtained when a thresholding was adapted to the former and rotating scans transducers to the latter. The results of the study are helpful for the choice of detected distance and the evaluation of reconstructed images.