高速旋转物体的CT图像重建方法

高速旋转物体的CT成像是难点问题,相关研究论文较少.由于CT检测系统的单幅投影的数据采集时间无法足够短,导致无法采集高速旋转物体准静止的CT扫描数据,从而使得基于逐条射线的经典CT成像模型不再适用于高速旋转物体CT成像.本文针对高速旋转物体CT,给出了数据采集准则,建立了射线混叠CT成像模型,并提出了相应迭代重建算法.仿真数据和实际数据的实验结果表明,本文提出的方法可以较好地对高速旋转物体进行CT成像.

lmage Reconstruction Algorithm for High-Speed Rotating Object Computed Tomography

The computed tomography (CT) for high-speed rotating objects is a difficult problem.There are few papers published on this topic.Because the scanning time of CT systems is not short enough to capture the quasi-static projection data of a high-speed rotating object,the traditional ray-by-ray-based CT imaging model is not applicable.In this paper,we present a principle of choosing data sampling time,establish a ray-overlapped CT imaging model for high-speed rotating objects,and propose a related iterative reconstruction algorithm.Both simulation and realistic experiment results show that the proposed method can effectively reconstruct the image of high-speed rotating objects.