注: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)
作者:郑源彩 刘子龙 薛迎 唐灵洁
单位:中北大学 山西太原 030051
中图分类号:TP 391.9
文献标识码:A
文章编号:1006-883X(2011)08-0021-03
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。
关键字:CT图像;有限角度;图像重建;迭代算法
Comparative study of CT limited angle algorithms
ZHENG Yuan-cai, LIU Zi-long, XUE Ying, TANG Ling-jie
North University, Taiyuan 030051,China
Abstract: 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 90o. Consequently, the reliable theoretical bases for imaging systems based on C-arm CT technology are provided.
Keywords: CT image; limited angle; image restruction; iterative algorithm
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备注:2011年 第17卷 第8期