基于中值滤波的口腔CT图像环形伪影去除算法

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英文篇名：Ring Artifact Reduction of Dental CT Image Based on Median Filter 作者：王闯 ; 李诗 ; 吴少海 ; 彭晓龙 英文作者：WANG Chuang;LI Shi;WU Shao-hai;PENG Xiao-long;Guangdong Medical Devices Quality Surveillance and Test Institute; 关键词：CT图像 ; 口腔领域 ; 中值滤波 ; 环形伪影 英文关键词：CT image;;dental field;;median filter;;ring artifact 中文刊名：ZGQX 英文刊名：China Medical Device Information 机构：广东省医疗器械质量监督检验所; 出版日期：2018-05-15 出版单位：中国医疗器械信息 年：2018 期：v.24 基金：广东省省级科技计划项目(项目名称:兴宁市可持续发展实验区基层医院远程放射诊断服务体系的构建及示范应用,项目编号:2014A020223006) 语种：中文; 页：ZGQX201809013 页数：3 CN：09 ISSN：11-3700/R 分类号：33-34+50

摘要

口腔锥形束CT系统在临床口腔成像领域具有重要的应用,但由于平板探测器上探测元的响应不一致,导致重建的CT图像含有环形伪影,图像质量退化。提出基于中值滤波的口腔CT图像环形伪影去除算法,对伪影图像分别利用二维中值滤波和径向一维中值滤波进行处理,并相减得到差值图像,将差值图像归一化后再带入加权函数模型中得到权重图像,最后进行图像融合,得到无环形伪影CT图像。实验表明,与传统方法相比,在伪影去除和结构信息保持方面取得满意的效果。
        Dental cone beam CT system plays an important role in clinical imaging field. However, ring artifacts are caused by detector bin gain variations of flat-panel detectors, leading to deterioration of image quality. A method for ring artifact reduction of dental CT image based on median filter is proposed. A difference image from two images obtained from processing ring artifact CT using respectively two-dimensional median filter and one-dimensional radial median filter and a weighting model are used to generate a weighting image. Fusion of two filtered images above performed based on weighting image leads to final image without ring artifacts. Experimental results show that the proposed method behaves better than traditional algorithms in terms of artifacts removing and edge preserving.

引文

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