摘要
环状伪影是多种CT图像中普遍存在的一种伪影,主要由像元响应不理想等因素引起。全变差最小化是一种广泛使用的去噪方法,将全变差最小化应用于CT图像,在模拟投影数据中人为添加噪声并重建,使用全变差最小化进行处理,观察图像环状伪影的去除情况,并得出了图像峰值信噪比随全变差最小化次数的变化曲线。
Ring artifact is one of common artifacts appearing in CT images, which is mainly caused by the inconsistent re-sponse of detector pixels and other factors. Total variation minimization is a widely used image denoising method. In this paper, the total variation is applied on CT image to reduce ring artifact. Simulative projection data is added with noise. Af-ter reconstruction, total variation minimization is used to process the reconstruction image. The experiment demonstrates that total variation minimization can efficiently reduce ring artifact, and a curve of PSNR shows that the result can be con-trolled by total variation minimization numbers.
出处
《计算机工程与应用》
CSCD
北大核心
2015年第21期195-198,共4页
Computer Engineering and Applications
基金
南京市科技计划项目(2008软资03027)
关键词
环状伪影
全变差最小化
CT图像
图像降噪
ring artifact
total variation minimization
CT image
image denoising
