上海大学学报(自然科学版)

• 通信与信息工程 • 上一篇    下一篇

图像重建中X射线投影模拟的常用方法

黄建林,吕东辉   

  1. 上海大学 通信与信息工程学院,上海 200072
  • 收稿日期:2005-05-31 修回日期:1900-01-01 出版日期:2006-06-30 发布日期:2006-06-30
  • 通讯作者: 吕东辉

General Methods for X-Ray Projection Simulation in Image Reconstruction

HUANG Jian-lin,LU Dong-hui   

  1. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China

  • Received:2005-05-31 Revised:1900-01-01 Online:2006-06-30 Published:2006-06-30
  • Contact: LU Dong-hui

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.

关键词: 插值, 模拟, 投影, 图像重建

Abstract:

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 are rigorous for regular and homogeneous objects, and projections acquired with discrete methods are acceptable for irregular and inhomogeneous objects in image reconstruction.

Key words: interpolation, projection, simulation, image reconstruction