椎基底动脉系统又称后循环,由椎动脉、基底动脉、大脑后动脉及各级分支组成,主要对脑干、小脑、枕叶、颞叶后部和丘脑等部位供血。椎基底动脉供血不足(vertebrobasilar insufficiency,VBI)是20世纪50年代,相对于颈动脉供血不足而提出的概念,随着神经影像技术的发展和对后循环缺 Vertebrobasilar artery system, also known as the posterior circulation, from the vertebral artery, basilar artery, posterior cerebral artery and branches at all levels, mainly on the brainstem, cerebellum, occipital lobe, temporal lobe and thalamus and other parts of the blood supply. Vertebrobasilar insufficiency (VBI) is a concept proposed in the 1950s with respect to insufficient blood supply to the carotid arteries. With the development of neuroimaging techniques and the lack of knowledge of the posterior circulation