一种快速数字化重建放射摄影成像算法  

A FAST ALGORITHM FOR DIGITALLY RECONSTRUCTED RADIOGRAPHS

作　　者：曲桂红[1] 张大力[1] 阎平凡[1] 

机构地区：[1]清华大学自动化系,北京100084

出　　处：《中国生物医学工程学报》2002年第4期341-345,共5页Chinese Journal of Biomedical Engineering

基　　金：北京市科技新星计划基金项目资助 ( 195 18710 0 7)

摘　　要：为了实现虚拟模拟 (VirtualSimulation)与虚拟放射摄影 (VirtualRadiograph) ,提出一种由序列断层图像进行数字化重建放射摄影图像 (DigitallyReconstructedRadiographs DRRs)的快速射线跟踪算法。利用CT数据模拟人体组织对辐射线的吸收规律 ,采用三维Bresenham直线算法进行射线跟踪 ,无需解方程求交点 ,算法只包含加减运算 ,计算速度快 。To realize virtual simulation and virtual radiograph, a fast ray tracing algorithm for digitally reconstructed radiographs (DRRs) is presented. Calculation of the absorption of X-ray by the tissue employs the CT data. Bresenham′s two dimension line generating algorithm is generalized to three dimension for X-ray tracing. Without calculations for equation solving, only +/- operation for calculation of interaction points is included. The algorithm is proved to be fast and shortens the time of image construction.

关 键 词：数字化 放射摄影成像算法 DRRs 射线跟踪 虚拟模拟 虚拟摄影成像 

分 类 号：R811[医药卫生—放射医学] TN911.73[医药卫生—临床医学]