Text this: 后循环症状性急性缺血性卒中患者椎基底动脉几何形态与基底动脉斑块的HR-VWI分析 HR-VWI Analysis of Vertebrobasilar Artery Geometric Shapes and Basilar Artery Plaques in Patients with Symptomatic Acute Ischemic Stroke in the Posterior Circulation