联合代数重建算法中基于像素的投影计算方法  

Projection computation based on pixel in simultaneous algebraic reconstruction technique

作　　者：王旭[1] 陈志强[1] 熊华[1] 张丽[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《核电子学与探测技术》2005年第6期785-788,784,共5页Nuclear Electronics & Detection Technology

摘　　要：联合代数重建法是CT重建的一种重要方法,算法中投影计算时间占重建时间的一半以上。提出一种可以在联合代数重建方法中快速计算投影系数矩阵并优化内存的方法。该方法从每个像素出发直接定位到相交射线,随后利用该结果完成投影系数的计算,并可利用射线、像素的相关性优化计算。SART is an important arithmetic of image reconstruction,in which the projection computation takes over half of the reconstruction time. An efficient way to compute projection coefficient matrix together with memory optimization is presented in this paper. Different from normal method, projection lines are located based on every pixel, and the following projection coefficient computation can make use of the results. Correlation of projection lines and pixels can be used to optimize the computation.

关 键 词：联合代数重建 图像重建 投影系数 基于像素 

分 类 号：TN919.8[电子电信—通信与信息系统]