摘要
基于R-line算法,对各种锥形束的源轨道的重构区域作了数学描述,给出了重构区域的定义并分析了重构区域的存在性,解析了正交双圆轨道、螺旋轨道以及鞍形轨道等典型轨道对应的重构区域的剖面特征,并讨论了轨道离散化对重构精度的影响.实验结果表明,重构区域的几何参数对空间中的生成点集有控制作用,轨道离散化后的重构点分布具有聚集性,重构剖面上误差分布不均匀.
The reconstruction ranges of various cone-beam source trajectories are mathematically described based on the R-line algorithm, and the definition and existence of the reconstruction ranges are studied. Then, the section characteristics of the reconstruction ranges of several typical trajectories such as orthogonal double circles, helix and saddle trajectories are investigated. The effect of trajectory discretization on the reconstruction accuracy is finally discussed. Experimental results show that the sets of reconstructed points are controlled by the geometric parameters of the reconstruction range, and that the reconstructed points after the trajectory discretization non-uniformly distribute with an uneven reconstruction error distribution.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第5期25-29,40,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省自然科学基金资助项目(05006593)
关键词
锥形束重构
重构区域
轨道几何
重构精度
计算机断层成像
cone-beam reconstruction
reconstruction range
trajectory geometry
reconstruction accuracy
Com- puted Tomography
