关键词: 环状伪影, 全变差最小化, CT图像, 图像降噪

Abstract: Ring artifact is one of common artifacts appearing in CT images, which is mainly caused by the inconsistent response 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. After 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 controlled by total variation minimization numbers.

Key words: ring artifact, total variation minimization, CT image, image denoising