CTA(Computed tomographic angiography,计算机体层摄影血管成像)是在团注动态扫描和三维影像重建等技术的基础上发展起来的血管成像技术.其基本原理是:使用螺旋扫描方式,在静脉团注使兴趣区血管内强化达到高峰期间,进行一次屏气的连续快速体积扫描,并以三维重建方式显示血管结构的影像.随着螺旋CT临床应用的不断增多,CTA已成为对血管性病变具有诊断价值的一种先进检查方法,尤其 Computed tomographic angiography (CTA) is a technique of vascular imaging developed on the basis of techniques such as bolus dynamic imaging and three-dimensional image reconstruction.Its basic principle is as follows: using spiral scanning, During the peak intensification of the vessels in the interest area, a continuous breath-hold volumetric scan was performed and the images of the vessel structure were displayed in three-dimensional reconstruction. As the clinical application of spiral CT continues to increase, CTA has become a diagnostic value for vascular lesions An advanced inspection method, especially