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

作　　者：傅健[1] 路宏年[1] 龚磊[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100083

出　　处：《兵工学报》2006年第6期1019-1022,共4页Acta Armamentarii

基　　金：中国博士后科学基金项目(2004036038);北京大学工程研究院科研合作平台建设计划项目资助(204042)

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。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 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]