摘要
针对现有系统矩阵算法复杂、效率低的问题,提出了一种简易的线段加权算法。对比传统线段加权算法,所提算法大大减少了对直线与网格相交情况的判断,使用二维方式对网格进行编号,并且基于提出的算法对传统线段加权法计算系统矩阵过程进行了改进。采用改进方法计算的系统矩阵重建图像,并且对重建图像质量进行评价。实验结果表明,所提算法的运算速度比Siddon改进算法提高了3倍以上,并且重建图像的质量随着线段加权法中计算线段数目增加而逐步提高。
In view of complicated and inefficient calculation of system matrix, a simple length weighted algorithm was proposed. Compared with the traditional length weighted algorithm, the proposed algorithm reduced situations of the intercepted photon rays with the grid and the grid index of the proposed approach was determined in the two-dimensional coordinate. The computational process of the system matrix was improved based on the proposed algorithm. The image reconstructed with the system matrix was constructed through the new process, and the quality of the reconstructed image was assessed. The experimental results show that the operation speed of the proposed algorithm is more than three times faster than Siddon improved algorithm, and the more lengths in the length weighted algorithm get considered, the better quality of the reconstructed image has.
出处
《计算机应用》
CSCD
北大核心
2013年第1期53-56,68,共5页
journal of Computer Applications
基金
留学回国人员科研启动基金资助项目(2010-1561)
云南省教育厅科学研究基金资助项目(2012J090)
关键词
系统矩阵
投影系数
线段加权
Siddon改进算法
图像质量评价
system matrix
projection coefficient
length weighted
Siddon improved algorithm
image quality assessment
