摘要
从1971年Hounsfield完成世界上首次X射线计算机断层成像(CT)扫描以来,CT技术在扫描方式上经历了5代发展,并在医疗、安检等领域深刻地影响着人们的生活。在扫描方式不断进步的同时,重建方法也在不断发展。与迭代算法相比,解析算法具有重建速度快、误差分析简单以及占用运算资源小等特点,成为CT系统中常用的成像算法。本文以CT扫描方式的发展为脉络介绍解析重建方法的发展,从经典的圆轨迹和螺旋轨迹扫描出发,到非标准轨迹扫描,并介绍当前有关多源直线CT的研究进展。最后,我们展望CT系统的发展在未来所面临的挑战。
Since the first X-ray computed tomography(CT)scanning was performed by Hounsfield in 1971,CT has mainly walked through five generations and deeply influenced us in many fields,such as medical applications and security inspections.With the development in CT scanning configurations,their reconstruction theories have been growing rapidly.Compared with iterative methods,analytical algorithms can achieve faster reconstruction with simpler error analysis and fewer computing resources,which makes them rather popular in CT products.This review strives to illustrate analytical CT reconstruction methods following the development of scanning modes,from circular and helical trajectories to nonstandard trajectories.As a special case of nonstandard trajectories,recent progress on multi-source linear CT is also highlighted.Finally,we discuss some opportunities and challenges of CT scanning configurations in the future.
作者
陈昶羽
高河伟
张涛
邢宇翔
张丽
陈志强
CHEN Changyu;GAO Hewei;ZHANG Tao;XING Yuxiang;ZHANG Li;CHEN Zhiqiang(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Key Laboratory of Particle&Radiation Imaging(Tsinghua University),Ministry of Education,Beijing 100084,China;National Engineering Laboratory for Dangerous Articles and Explosives Detection Technologies,Beijing 100084,China)
出处
《CT理论与应用研究（中英文）》
2021年第2期263-277,共15页
Computerized Tomography Theory and Applications
基金
国家自然科学基金(11525521)。
关键词
X射线计算机断层成像
CT解析重建
非标准轨迹扫描
直线轨迹扫描
分布式光源CT
X-ray computed tomography
analytical CT reconstruction
nonstandard trajectory scanning
linear trajectory scanning
distributed source CT
