南方医科大学学报Issue(9)：1258-1262,5.
基于投影域小波滤波处理的CT图像环形伪影去除方法
CT ring artifact reduction using an improved wavelet filtering in the sinogram domain
摘要
Abstract
Objective Ring artifacts often appear in flat-panel detector-based CT images due to the malfunction or mis-calibration of the detector elements that result in stripe artifacts in the line integral projection (sinogram) data. The ring artifacts lower the image quality and affect image-based diagnoses. Here we propose a ring artifacts removal approach based on wavelet filtering in the sinogram domain. The line integral projection (sinogram) dataset were divided into 4 sub-sinogram dataset, and for each of them the wavelet decomposition operation was employed to produce the associated wavelet dataset, followed by filtering operation on the vertical detail band and the low-pass detail band. Wavelet reconstruction operation was then performed, and the weighted moving average filter was used to yield the filtered sinogram, which was processed using filtered back-projection (FBP) for image reconstruction. The results showed that the proposed approach could effectively remove the ring artifacts while preserving the structural information of the image.关键词
CT/线积分投影数据/环形伪影/小波变换/加权均值滤波Key words
computed tomography/sinogram data/ring artifacts/wavelet filtering/average filter引用本文复制引用
郭宏,曾栋,张华,黄静,张敬,马建华..基于投影域小波滤波处理的CT图像环形伪影去除方法[J].南方医科大学学报,2015,(9):1258-1262,5.基金项目
国家自然科学基金（81371544，81501466）；国家科技支撑计划项目（2014BAI17B02） Supported by National Natural Science Foundation of China (81371544,81501466) （81371544,81501466）
