锥束射线三维大视场工业CT成像方法研究  

Research on cone-beam ray three dimensional large field of view industrial CT imaging method

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：《光学技术》2006年第2期209-212,共4页Optical Technique

基　　金：博士后科学基金资助项目(2004036038)

摘　　要：基于FDK重建算法和圆轨道锥束扫描的三维ICT(industrial computed tomography)因算法的简洁性和工程实现的可行性已成为目前主要的3D-ICT成像技术。由于受探测器长度的限制,该技术的扫描视场小,所以可检构件尺寸受到限制。为解决较大尺寸构件3D-ICT的检测问题,讨论了一种仅需旋转检台偏置的大视场3D-ICT成像方法,推导了基于FDK原理的滤波反投影(filter back-projection,FBP)重建算法。计算机模拟和实验结果证明了该技术的正确性。分析表明,其水平方向的有效扫描视野比基于FDK的圆轨道锥束扫描三维CT提高了80%以上。Cone-beam three-dimensional inductrial computed tomography（3D-ICT） with circular orbit scan mode based on FDK reconstruction algorithm is more favorable than other types. It is mathematically simpler and more feasible. However, limited by the length of detector, this technique has a small field of view. In order to execute the 3D-ICT inspection of large objects an imaging method called large field of view 3D-ICT shifting the rotation gantry was discussed. Its filter back-projection reconstruction algorithm based on FKD principle was deduced. The results of computer simulation and experiments prove the validity of this method. Anlysis shows that the scan field of view along the horizon can be improved no less than 80% compared with cone-beam 3D-CT based on FDK and circular orbit scan mode.

关 键 词：工业CT 3D-ICT FDK重建算法 圆轨道扫描 大视场扫描 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]