医学CT序列图像的混合去噪算法  

Hybrid Denoising Algorithm for Medical CT Sequence Images

作　　者：陈锦林 原培新[1] CHEN Jin-lin;YUAN Pei-xin(School of Mechanical Engineering&Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2024年第4期464-473,共10页Journal of Northeastern University(Natural Science)

摘　　要：医学CT(computer tomography)序列图像会因为各种原因而掺杂噪声,去噪能够有效地提高图像的质量.常见的去噪算法都是针对单张图像进行,考虑到CT序列图像之间具有很高的相似性,本文提出一种基于相邻图像结构相似性的混合去噪算法.该算法首先计算序列图像的最大和最小灰度值,根据灰度值绘制直方图,设定相关阈值参数,根据筛选之后的直方图计算窗宽窗位,然后进行调窗处理.之后计算目标图像与其前后相邻图像之间的结构相似性,最后根据结构相似性对3张图片混合使用BM3D和高斯滤波2种去噪算法.通过对比实验表明,该算法在均方误差、峰值信噪比和结构相似性三方面都有所提高,能够有效地提高图像质量.The medical CT sequence images dopes noise for various reasons.Denoising can effectively improve image quality.The common algorithms are used for single image,while the CT sequence images have high similarity between adjacent images.Therefore,this paper proposes a hybrid denoising algorithm based on the structural similarity.Firstly,a histogram is drawn according to the maximum and minimum gray value.Secondly,relevant threshold parameters are set to calculate the window width and window level,and then conduct window adjustment.Thirdly,the structural similarity of the target image and its adjacent images are calculated.Finally,BM3D and Gaussian filtering algorithms are mixed for three images according to structural similarity.Experimental results show that the algorithm can improve the mean square error,peak signal-to-noise ratio and structural similarity,which effectively improves the image quality.

关 键 词：医学CT序列图像 结构相似性 混合去噪算法 直方图 调窗处理 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN911.73[自动化与计算机技术—计算机科学与技术]