基于先验信息的二值血管锥束迭代重建  

Iterative Cone-Beam Reconstruction Algorithm for Binary Vessel Based on Prior Information

作　　者：俞恒永[1] 牟轩沁[2] 汤少杰[2] 蔡元龙[2] 

机构地区：[1]杭州电子工业学院通信分院,浙江杭州310018 [2]西安交通大学电信学院图像所,陕西西安710049

出　　处：《电子学报》2004年第4期575-579,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.30070225);教育部高等学校骨干教师基金;杭电基金(No.KYS081503015)

摘　　要：基于旋转DSA(Digital Subtraction Angiography)的血管三维重建是当前医学图像处理领域的一个新的研究热点,具有广阔的应用前景.本文在SART(Simultaneous Algebraic Reconstruction Technique)算法的基础上,根据穿过每个体素的锥束射线误差的加权平均值,构造了二值体素状态转移的概率函数,实现了一种适用于二值三维图像的迭代重建算法.针对二值三维血管的特点,本文采用最大均匀性准则作为重建目标的先验信息对迭代过程进行约束,使得迭代过程具有很好的体积聚类功能,大大提高了三维图像的重建质量.以Defrise模型和冠状动脉模型作为研究对象,试验结果表明,本文的重建算法在抑制噪声保持目标结构信息等方面优于经典的Feldkamp算法.Three-dimensional (3D) reconstruction of blood vessel based on rotational digital subtraction angiography (DSA) is a new hot issue in the field of medical image processing. And it has a prospect of being widely used. On the basis of simultaneous algebraic reconstruction technique (SART), the state transition probability is constructed depending on a weighted average of all rays that traverse the voxel, thus an iterative reconstruction algorithm for binary object is developed. According to the character of 3D binary blood vessel, the maximum uniform criterion is adopted to constrain the iterative procedure. It has a function of volumetric cluster and it can greatly improve the reconstruction quality. The simulation experiments are executed on Defrise model and coronary artery model. The experimental results show that the proposed algorithm in this paper is better than Feldkamp algorithm especially in the aspect of suppressing noise and preserving structure information of reconstructed object.

关 键 词：锥束重建 三维重建 SART 旋转DSA 二值目标 

分 类 号：TN911[电子电信—通信与信息系统] R814[电子电信—信息与通信工程]