CT有限角度算法的比较研究  

Comparative study of CT limited angle algorithms

作　　者：郑源彩[1] 刘子龙[1] 薛迎[1] 唐灵洁[1] 

机构地区：[1]中北大学,山西太原030051

出　　处：《传感器世界》2011年第8期21-23,共3页Sensor World

基　　金：国家自然科学基金资助项目(项目编号:60772102);山西省自然科学基金资助项目(项目编号:2010011002-1)

摘　　要：在医学临床中,C形臂X射线机的应用愈来愈广泛。由于C臂机自身的特点,且所检测物体的密度及形状存在较大差异,使得其在有限角度下所获得的投影图像断截,投影数据不完全。本文主要分析在有限角度下CT图像最优准则重建的算法。通过对迭代重建算法ART、SART以及TV-SART的比较,得知在有限角为90°的情况下,TV-SART的重建图像更为清晰,更接近原始图像,从而为基于C形臂CT的成像系统的实现提供可靠的理论支撑。C-arm X ray machines are being used more and more widely in medical clinic field. As the characteristics of C-arm machines, different density values and shapes are got from same target object. This situation results in the broken projection images under the limited angles and incomplete projection data In this paper the optimality criteria reconstruction algorithm for CT images under limited angles is analyzed mainly. Compared with iterative reconstruction algorithms of ART, SART and TV-SART, the reconstruction images of TV-SART are much clearer and closer to the original images under the limited angles of 90°. Consequently, the reliable theoretical bases for imaging systems based on C-arm CT technology are provided.

关 键 词：CT图像 有限角度 图像重建 迭代算法 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]