高速旋转物体的CT图像重建方法  

Image Reconstruction Algorithm for High-Speed Rotating Object Computed Tomography

作　　者：陈德峰[1,2] 于平[1,2] 张朋[1,2] 

机构地区：[1]首都师范大学数学科学学院,北京100048 [2]检测成像北京高校工程研究中心,北京100048

出　　处：《电子学报》2015年第9期1786-1792,共7页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61127003;No.61371195;No.61401289);北京数学与信息交叉科学协同创新中心资助

摘　　要：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CL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.The computed tomography （CT）for high-speed rotating objects is a difficult problem.There are few papers pub-lished 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 re-construct the image of high-speed rotating objects.

关 键 词：高速旋转物体 射线混叠 CT 模型 重建算法 采样时间 解调 

分 类 号：TN911.23[电子电信—通信与信息系统]