线源圆轨道锥束扫描三维CT重建算法
Reconstruction Algorithm for the Circular Orbit Cone-beam Scan 3D-CT with Line-focus Source
傅健 1路宏年 1龚磊1
作者信息
- 1. 北京航空航天大学,机械工程及自动化学院,北京,100083
- 折叠
摘要
基于点X射线源圆轨道锥束扫描的FDK近似3D-CT重建算法重建速度快,在10°锥角内重建精度高,因此在工程上得到广泛应用.但是,这种算法不能满足线X射线源圆轨道锥束扫描的情况.为此,将上述点源FDK近似原理拓展到线源情况,推导了线源圆轨道锥束扫描3D-CT重建算法.计算机仿真结果证明了该算法的正确性.利用这种算法,对圆轨道锥束大视场扫描3D-CT实验数据进行重建,获得了正确的图像.
Abstract
FDK three-dimensional computed tomography (3D-CT) reconstruction algorithm for the circular orbit cone-beam scan with the point-shaped X-ray source is more widely accepted when compared with other types. It has high reconstruction speed and accuracy within cone-beam angle of 10°. However, this algorithm does not apply for circular orbit cone-beam scan with line-focus X-ray source. So the FDK approximation principle of the point-focus X-ray source is extended to line-focus X-ray sources. An algorithm for the reconstruction of circular orbit cone-beam scan to the line-focus X-ray source was deduced. Computer simulation results prove the validity of the algorithm. Using the experimental data of circular orbit cone-beam large-field-of-view scan, the reconstruction algorithm creates the right images.
关键词
信息处理技术/三维计算机X射线断层摄影术/圆轨道锥束扫描/FDK重建算法/线源扫描Key words
information processing/3D-CT/circular orbit cone-beam scan/FDK reconstruction algorithm/scanning with line-focus source引用本文复制引用
基金项目
中国博士后科学基金(2004036038)
北京大学校科研和教改项目(204042)
出版年
2006
NETL
NSTL
维普
万方数据