基于X射线造影图像的冠状动脉运动分析  

Coronary Artery Motion Estimation Using X-ray Cineangiogram

作　　者：孙正[1] 郁道银[1] 黄家祥[1] 徐智[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,光电信息技术科学教育部重点实验室,天津300072

出　　处：《生物医学工程学杂志》2005年第4期690-694,共5页Journal of Biomedical Engineering

摘　　要：我们提出了一种采用X射线造影图像对冠状动脉的非刚性运动进行分析的方法,通过寻找两帧图像之间血管上点的对应关系,得到各点的运动向量。匹配中同时考虑了运动场的光滑性和血管的形状相似度。同时由于变形前后血管的长度可能不同,因而加入了对无匹配部分的处理,保证了匹配的均匀性。采用动态规划完成对最优匹配的搜索,减少了计算量。采用仿真图像和临床得到的造影图像分别对该算法进行了验证,对仿真图像运动向量估计的均方根误差在1个像素左右。对临床造影图像的实验也得到了较为满意的结果。This paper presents an approach for estimating the non-rigid motion of coronary arteries using digital angiographic images. Displacement vectors of vessel points are obtained by finding points correspondences in two successive frames. Smoothness of motion field and vessel deformation measurement are considered in matching, and unmatched regions are also dealt with in the fact that the vessel after deformation may have different size with its original station. The search strategy for optimal matching is carried out using dynamic programming （DP） so that computing cost is reduced. Results of this motion estimation method applied to synthetic and clinical images have shown that the method is accurate, with a root mean square error about one pixel for simulated data. For the case of actual X-ray coronary angiographic images, visual inspection of the detected pairs of points shows that the results are very encouraging.

关 键 词：冠状动脉造影 运动估计 动态规划 造影图像 运动分析 冠状动脉 X射线 对应关系 匹配 非刚性 

分 类 号：R543[医药卫生—心血管疾病]