先验图像约束的有限角度CT图像重建算法  

Prior Image Constrained CT Image Reconstruction for Limited Angle Data

作　　者：郭静钰 齐宏亮[1] 袁媛[1] 周凌宏[1] 

机构地区：[1]南方医科大学生物医学工程学院医疗仪器研究所,广州510515

出　　处：《核电子学与探测技术》2014年第12期1421-1424,共4页Nuclear Electronics & Detection Technology

基　　金：广东省战略性新兴产业核心技术攻关(2011A081402003);广州市战略性新兴产业重大专项(2011Y 1-00019)

摘　　要：对于有限角度CT图像重建,提出一种基于先验图像约束的迭代重建方法。将先验图像中各种均匀组织的平均值作为先验信息引入到重建图像目标函数中,约束待重建图像。对Shepp-Logan体模进行了仿真重建实验,并与ART、ART-TV算法进行了主观和客观的对比评价。实验结果表明,本文方法信噪比更高,平均误差更小,重建图像的伪影和变形程度大幅度减少。A new iterative approach based on prior image constraint for limited angle CT image reconstruction is proposed. In this work,the average value of each homogeneous substance in prior image as prior information is applied to objective function and to constrain reconstructed image. Simulation and reconstruction for Shepp-Logan phantom is performed by the proposed method,ART algorithm and ART-TV algorithm. The experimental results show the proposed approach can improve the signal to noise ratio,decrease the average error,and significantly reduce the degree of deformation and artifacts.

关 键 词：CT重建 有限角度 ART-TV算法 先验图像约束 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]