一种改进投影系数计算的快速ART算法  

A Fast Algebraic Reconstruction Algorithm Based on Improved Projection Coefficient Computation

作　　者：杨文良[1] 魏东波[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《CT理论与应用研究（中英文）》2012年第2期187-195,共9页Computerized Tomography Theory and Applications

基　　金：国家自然科学基金资助项目(61077011)

摘　　要：代数重建(ART)是图像重建领域中的重要方法。为了提高ART算法的重建速度,本文提出了一个新的通过判别射线与网格的相交状况快速计算投影系数的算法。该算法主要使用简单的诸如加减法以及比较运算来计算投影系数。避免了传统算法中的求交排序计算,因而重建速度大大提升。仿真实验使用Shepp-Logan模型,实验结果显示该算法重建效率优于传统算法。Algebraic Reconstruction Technique is an important method for image reconstruction. To improve the reconstruction speed of ART, this paper presents a new and fast algorithm to calculate projection coefficient based on different situations of grids intercepted by ray. This Algorithm can calculate the projection coefficient by simple operation such as addition, subtraction and comparison. Since the computation of intersection and sorting in traditional algorithms are avoided, the reconstruction speed is greatly increased. The experiments using Shepp-Logan phanom show that the new algorithm is more effective than the traditional algorithms.

关 键 词：迭代重建 图像重建 投影系数 代数重建算法 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]