1·MAIN OUTCOME MEASURES: Type, distribution and proportion of vessel structural abnormity of aortic arch, carotid artery and vertebrobasilar system.
主要观察指标：主动脉弓、颈内动脉及椎基底动脉系统血管结构异常的类型、分布及比例。
2·Aimed at solving detection and track difficulty of aortic arch dynamic image we proposed dynamic image detection method based on coordinate track.
针对解决主动脉弓运动图像检测和跟踪的难点，提出了基于坐标跟踪的动态图像检测方法。
3·Objective to investigate the severity and relative risk factors of aortic arch atherosclerosis (AAA) in patients with cerebral embolism.
目的探讨脑栓塞患者的主动脉弓动脉粥样硬化(AAA)严重程度及其有关的危险因素。
4·To investigate the aortic arch deformity and its clinical importance.
目的：研究主动脉弓畸形及其临床意义。
5·The main view observed was four-chamber and combined with long axial view, short axial and aortic arch view etc, as well as color Doppler and pulsed Doppler examination.
以观察胎心四腔观为基础，酌情增加长轴、短轴、主动脉弓等切面观，并适当配合彩色多普勒及脉冲多普勒超声检查。