应用小波变换增强肝癌CT图像  

Liver cancer CT image enhancement using wavelet transform

作　　者：王志强[1] 冯丹[2] 

机构地区：[1]解放军总医院,北京市100853 [2]北京军医学院,北京市100071

出　　处：《医疗卫生装备》2004年第6期20-22,共3页Chinese Medical Equipment Journal

摘　　要：应用小波变换多分辨率特性,对肝癌患者CT图像进行增强处理。文中选取具有紧支性、正交性和近似对称性的小波函数sym4对图像进行2层多尺度二维小波分解,分别选取阈值为犤550,350,250犦对分解后的小波系数进行处理,突出低频部分,消弱高频部分。通过小波函数sym4对图像进行重构,从而得到增强的图像,使肿瘤影像更加突出,便于诊断。该方法进一步证实了小波变换在医学图像增强中的作用。This paper introduces the wavelet transform with multiresolution for liver cancer CT image enhancement. As the wavelet transform with compact support, orthogonality and approximately symmetry, SymletsA (sym4) wavelet family is applied to the two-layer multiscale decompose of the CT image. The decomposed wavelet coefficients are processed with the threshold values of 550, 350 and 250, with the low -frequency region intensified and the high-frequency one weakened. Then the image is reconstructed and thus the image is enhanced. Wavelet transform proves efficient in CT image enhancement.

关 键 词：小波变换 盱癌 CT图像 多分辨分析 CT检查 

分 类 号：R735.7[医药卫生—肿瘤] R814.42[医药卫生—临床医学]