心脏冠状动脉数字造影图像增强研究

本文提出了一种基于图像配准的数字减影图像增强算法，在注入造影剂前，首先聚取一系列连续掩图像（30帧／s)，然后注入造影剂摄造影图像，将造影图像与掩膜序列图像进行全局配准，找到其中匹配的掩膜图，最后再用块匹配方法对该造影图像和四配的掩膜图像进行局部酏 准，在进行局部匹配时为了达到像不精度和较快的速度，运和一种快速样条插值方法。实验结果表明配准后的减影图像质量良好，具有较好的临床诊断价值。

Study of image enhancement of cardiac coronary artery digital angiography

Usually,live image is of low quality and may influence the subsequent analysis and diagnosis carried out by radiologists. In order to solve this problem, a new method is proposed. After acquiring a series of mask images with 30 frames per second, contrast material was injected and live images acquired. The live images were globally matched with the mask images to find the matchable mask image. Then images are regarded as acquired in the almost same phase of the cardiac motion cycle, after this, local the live image was locally matched with the corresponding globally matchable mask image with block match method. In order to implement fast and improve subppixel precision in local match, a fast spline interpolation method was employed. The experiments demonstrate that the subtraction images after registration are of high quality and much more diagnostic value.