基于FDK框架的锥形束Pseudo-LT优质重建  

Cone-beam pseudo lambda tomography under FDK framework

作　　者：黄静[1] 马建华[1] 陈凌剑[1] 毕一鸣[1] 陈武凡[1] 

机构地区：[1]南方医科大学生物医学工程学院,广东广州510515

出　　处：《南方医科大学学报》2009年第10期2094-2097,共4页Journal of Southern Medical University

摘　　要：目前医用CT已由二维扇形束扫描模式成功演变至三维锥形束扫描模式。本文作者从经典的FDK算法框架出发,结合Noo等人提出的二维扇形束超短扫描重建算法,并在本文作者先前工作的基础上,首次将二维Lambda tomography(LT)算法与FDK型算法结合,提出一种新的锥形束Pseudo-LT算法,新算法在回避了成像公式中有关PI线计算的同时,还将关于投影数据的微分运算进行回避,较基于PI线的LT重建有了较大改进,提高了图像重建速度和重建质量。数值实验进一步验证了本文算法的有效性。The medical CT scanner is rapidly evolving from the fan-beam mode to the cone-beam geometry mode. ha this paper, a new cone-beam pseudo Lambda tomography was proposed based on the Noo＇s fan beam super-short scan formula and FDK framework. The proposed pseudo-LT algorithm, which avoids the computation of any PI line and any differential operation, has a significant practical implementation, thus leading to the images with quality improvement and reduced artifacts. The results in the simulation studies confirm the observation that the new algorithm can improve the image resolution over the traditional algorithms with noise projection data.

关 键 词：CT 锥形束 FDK算法 Pseudo-LT 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]