基于不同频率成份衰减矫正的光声成像方法  

Photoacoustic Imaging with Attenuation Rectification of Different Frequent Components of Photoacoustic Signal

作　　者：谭毅[1] 邢达[1] 王毅[1] 曾亚光[1] 尹邦政[1] 

机构地区：[1]华南师范大学激光生命科学研究所,广州510631

出　　处：《光子学报》2005年第7期1019-1022,共4页Acta Photonica Sinica

基　　金：国家重大基础研究前期专项(2002CCC00400);国家自然科学基金面上项目(60378043);广东省自然科学基金团队项目(015012)资助

摘　　要：根据超声衰减理论,研究了光声信号不同频率成份随距离的衰减差异,及其对光声图像重建的影响;提出了对光声信号不同频率成份进行衰减矫正的成像方法,此方法增强了光声信号的高频成份,突出了吸收体的边界变化和细微的结构特征,提高了成像系统分辨率,实验结果显示系统分辨率由0.3mm提高到0.2mm.实验所用的光源为YAG激光器,波长为1064nm,重复频率为20Hz,脉宽为6ns,探测器为针状的PVDF膜水听器,接收面积的直径为1mm.The influences of attenuation coefficients of photoacoustic signals, which depends on frequencies, on the quality of reconstructed photoacoustic images has been explored. It reveals that the attenuation coefficients of low frequent components are less than those of high frequencies, and the latter are more important for photoacoustic imaging with high resolution. Based on the ultrasonic attenuation theory, the method of photoacoustic imaging with rectification of the attenuation of different frequent component was performed. The experiments results show that this method improves the resolution of reconstructed images, and the reconstructed images resolution improved from 0.3 mm to 0.2 mm. A Q-switched Nd ： YAG laser operating at 1064 nm was used as light source. The laser had a pulse width of 6ns and a repetition frequency of 20 Hz. A needle PVDF hydrophone with diameter of 1 mm was used to detect photoacoustic signals.

关 键 词：光声成像 光声信号 衰减 矫正 

分 类 号：Q334[生物学—遗传学]