OCT图像“双峰值效应”的维纳逆滤波恢复  

The Restoration of the Double peakin OCT Images Based on Inverse Wiener

作　　者：向际鹰[1] 吴震[1] 曾绍群[1] 骆清铭[1] 张平[1] 黄德修[1] 

机构地区：[1]华中理工大学光电子系

出　　处：《中国医疗器械杂志》1999年第2期68-72,共5页Chinese Journal of Medical Instrumentation

基　　金：图家自然科学基金

摘　　要：分析了ＯＣＴ系统中严重影响象质的“双峰值效应”，指出其起源为参考反射镜的介质高反膜，并通过建立相应的数学模型研究了其恢复的算法。从理论上推导了考虑双峰值效应后的ＯＣＴ系统点扩展函数。用平均平滑周期图法分别估算出信号与噪声的功率谱密度函数。最后用维纳逆滤波算法得到恢复图象，避免了普通逆滤波中的病态问题。该算法也可同时恢复因光谱有限带宽、象差等引起的图象降质。It has been found that the high reflectivity film of the reference mirror in OCT may cause a socalled double peak effect in the result images.To eliminate this a restoration algorithm is proposed here. The method is based on the mathematical modals of the pointspread function of OCT with consideration of double peak effect. The power spectrum of the noise and signal are estimated by the average smooth periodogram method. An inverse wiener filter algorithm, which avoids the illness condition in common inverse filter, gives the final restored images.The algorithm is also capable of the image degrading recovery due to the aberration and the band limited spectrum.

关 键 词：弱相干层析技术 维纳滤波 傅里叶变换 扫描成像 

分 类 号：R445[医药卫生—影像医学与核医学]