基于EMD的CT多分辨率重建  

Multi-Resolution CT Reconstruction Based on EMD Method

作　　者：陈方林[1] 王黎明[1] 韩焱[1] 

机构地区：[1]中北大学电子测试技术国家重点实验室,太原030051

出　　处：《无损检测》2009年第5期349-351,355,共4页Nondestructive Testing

基　　金：国家自然科学基金资助项目(60602041);(60532080);(60772102)

摘　　要：提出了基于经验模态分解(EMD)方法进行CT多分辨率重建。该方法利用了EMD方法自适应滤波的特性,以及CT重建过程的线性性质。将投影数据进行EMD分解后,对得到的内蕴模态函数(IMF)层进行特征选择和组合。由于每一IMF分别代表了信号的不同特征尺度,对IMF或IMF的组合进行重建就能直接得到不同的图像特征,从而实现CT多分辨率重建。试验结果表明,基于EMD的CT多分辨率重建,能够在重建的同时直接获取重建图像的多种特征。A multi-resolution CT reconstruction method based on EMD（Empirical Modal Decomposition） was presented. This method took advantage of the character of that EMD as a self-adaptive filter and the linear nature in the reconstruction process. Firstly, using EMD method decomposed the projection data. Afterward, the IMF （Intrinsic Mode Function） which contained the feature information needed was reconstructed. Since each IMF represented the signal characteristics of the different scales, it was able to directly reconstruct different image feature. Thus it could achieve the multi-resolution CT reconstruction. The experimental results showed that, this method could directly obtain multiple features of reconstructed image in reconstruction process.

关 键 词：经验模态分解 CT重建 图像处理 内蕴模态函数 

分 类 号：TN911.73[电子电信—通信与信息系统] TG115.28[电子电信—信息与通信工程]