CAJ | 학술논문

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。
배상위영시다충CT도상중보편존재적일충위영，주요유상원향응불이상등인소인기。전변차최소화시일충엄범사용적거조방법，장전변차최소화응용우CT도상，재모의투영수거중인위첨가조성병중건，사용전변차최소화진행처리，관찰도상배상위영적거제정황，병득출료도상봉치신조비수전변차최소화차수적변화곡선。
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.