声折射对光声成像的影响  

Photoacoustic Imaging Consideration of Ultrasonic Refraction

作　　者：谭毅[1] 何军锋[1] 

机构地区：[1]陕西理工学院物理系,陕西汉中723003

出　　处：《光电子．激光》2007年第8期1013-1016,共4页Journal of Optoelectronics·Laser

基　　金：陕西省教育厅自然科学中青年科技人才培养计划资助项目(06JK330)

摘　　要：研究了光声信号声速失配时所起的声折射对光声成像的影响,提出了利用与组织声速匹配的耦合液进行光声成像,并配置了几种适合于组织声速的超声耦合液。实验结果表明,进行声速匹配后重建出的图像对比度有明显地提高,背景伪迹减少,分辨率由0.50mm提高到0.15mm,重建图像与实物十分吻合。The influences of the acoustic refraction cause by the mismatch of ultrasonic velocities on photoacoustic image were studied. We have explored the acoustic velocity matching in image reconstruction. The experiments demostrated that the matching acoustic velocity greatly improved the contrast of the reconstructed image and obviously reduced the background artifacts;the spatial resolution of the reconstructed image was improved from 0. 50 mm to 0. 15 turn. Our study has great practical significance for applying photoacoustic tomography to norvinvasive clinic diagnosis of cancer.

关 键 词：光声成像 光声信号 图像重建 声折射 

分 类 号：R318.51[医药卫生—生物医学工程]