摘要
锥束CT是目前医学成像领域研究的热点.在CT图像重建算法研究和比较过程中,第一步工作就是获取投影数据.该文为正在研究CT的工作者或即将步入CT领域的研究者提供几种在图像重建中X射线投影模拟的理论方法,对这几种方法进行了比较详细的理论推导,讨论了它们各自的适用条件,在计算机上模拟实现并比较了它们在获取投影数据方面的优劣.结果表明,在物体形状规则且密度分布均匀的情况下,解析法与矢量法能获取真实投影,而在物体形状不规则和密度分布不均匀的情况下,离散法的效果也可以接受.
Cone-beam CT is an important research topic in image reconstruction. The first thing to do in the study of image reconstruction algorithm is to acquire projections. This paper presents several general methods of X-ray projection simulation, and discusses conditions under which different methods are applicable. Experiments are carried out to compare the pros and cones of these approaches when used in projection acquisition. The results show that projections acquired with analytic and vector methods arc rigorous for regular and homogeneous objects, and projections acquired with discrete methods are acceptable for inhomogeneous objects in image reconstruction. irregular and
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第3期228-233,共6页
Journal of Shanghai University:Natural Science Edition
基金
上海市教委发展基金资助项目(217433)
上海市宝山区科委基金资助项目(04-E-5)
关键词
图像重建
投影
模拟
插值
image reconstruction
projection
simulation
interpolation
