于一种新的扫描方式的滤波反投影算法。本文重点介绍了CT滤波反投影算法，有平行束也有扇束，其中扇束着重介绍了等距、重排算法，值得参考。-In a new way of scanning the filtered back projection algorithm. This paper focuses on CT filtered back projection algorithm, a parallel beam are also fan-beam, which focuses on the fan-beam offset, rearrangement algorithm, a good reference.