螺旋锥束精确重建算法优化  

The Optimization of Exact Reconstruction Algorithm for Spiral Cone-beam CT

作　　者：惠苗[1] 

机构地区：[1]三明学院数学与信息工程学院,福建三明365004

出　　处：《三明学院学报》2012年第4期20-23,共4页Journal of Sanming University

基　　金：福建省教育厅科技项目(JA12302)

摘　　要：精确重建算法是当今研究的热点,其反投影计算量很大。因此以Katsevich算法为例,将PI线二分法求端点转变为一元函数的迭代求根进行优化;利用锥束扫描模式存在的对称性和正、余弦的特性,减少计算投影位置的次数。实验表明,优化效果较好。Exact reconstruction algorithm is researched ardently, but the calculation amount of back projection is large. Taking Katsevich algorithm as an example, the dichotomy algorithm for calculating PI line root was transformed to the method of calculating the root of the one variant function. At the same time, calculation obtaining projection position is reduced by use of symmetry properties and the characteristics of positive and cosine in the mode of cone-beam scan. Experiments show that the optimization effect is good.

关 键 词：螺旋锥束 精确重建算法 PI线 算法优化 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]