基于倒置结构的直接体积CT

Direct Volume CT Based on Reverse Geometry

提出了一种新颖的直接体积 CT扫描结构 ,即采用面状扫描与点状探测的倒置扫描结构 .该扫描结构的最大优点可方便地得到完全的投影数据 ,解决了当前其他直接体积 CT方法中的诸多问题 ,如完全成像的扫描轨迹实现不便、面状探测器受康普顿散射影响大、重建算法复杂等 .对该扫描结构的设计、完全性条件、重建算法等进行了详细的论证与说明 ,并给出了初步的计算机仿真实验结果 .

This paper proposed a novel scanning structure of direct volume CT, which adapts planar scanning and point detecting, called reverse geometry volume CT. The most advantage of this scanning structure is that it can gain the complete data projections through simple movement of machine. Moreover, it solves many problems of other volume methods, such as the difficulty to implement scanning orbit for complete condition, huge influence of Compton scatter to the flat-panel detector-based volume CT scanner, and the complicated reconstruction of algorithms. This paper detailed the geometry, demonstrated its complete condition, gave a relatively simple reconstruction algorithm and presented the results by computer simulation.