利用维纳滤波改善声透镜光声成像系统的分辨率  

Resolution Improvement of Photoacoustic Imaging System Based on an Acoustic Lens with Winere Filter

作　　者：唐秀文[1] 唐志列[1] 吴泳波[1] 

机构地区：[1]华南师范大学物理与电信工程学院,广州510006

出　　处：《光子学报》2011年第1期103-106,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(No.60877068);国家高技术研究发展计划(No.2006AA02Z4B4)资助

摘　　要：为了克服衍射效应对光声成像系统分辨率的限制,需要采用逆卷积方法进行图像反演.从理论上分析了声透镜成像原理,模拟仿真了声透镜的点扩展函数对声透镜成像系统分辨率的影响和维纳滤波解卷积方法复原光声成像的过程,并利用自搭建的声透镜光声成像系统进行了深入的实验研究,得到了物平面上相距4 mm和3 mm的两个黑胶带点的直接成像光声图以及经过维纳滤波解卷积方法得到的还原图,并进行了比较.仿真结果与实验结果一致表明:用维纳滤波解卷积方法可以提高光声成像系统的分辨率.In order to overcome the limitation of diffraction effect on the resolution of photoacoustic imaging system,the deconvolution method needs to be used for image retrieval.The acoustic lens imaging theory was introduced firstly,and the effect of the acoustic lens point spread function was simulated based on the resolution of acoustic lens-based imaging system and photoacoustic imaging restoration process of Wiener filter deconvolution.Using self-erected acoustic lens-based photoacoustic imaging system,the direct photoacoustic imaging pictures and the restored pictures from Wiener filter deconvolution of two dots of black adhesive tape with a distance of 4 mm and 3 mm are obtained and compared.The simulation and experimental results indicate that Wiener filter deconvolution can improve the resolution of photoacoustic imaging system.

关 键 词：光声成像 声透镜 维纳滤波 分辨率 点扩展函数 

分 类 号：O43[机械工程—光学工程]