目的：探讨动态容积CT“中风一站式”检查对椎基底动脉扩张延长症（VBD）的诊断价值。方法：收集经动态容积CT诊断的VBD患者共22例（男16例、女6例，年龄39~79岁），在后台工作站上测量各例患者的基底动脉（BA）最大内径，进行BA高度评分和位置评分，并通过全脑灌注分析软件分析后循环区脑血流灌注状态。结果：22例VBD患者的BA最大内径平均为（6.12±1.73） mm（范围3.9~10.1 mm），BA的高度评分、位置评分分别为2.32±0.48、2.32±0.78（范围1~3）。增强CT及全脑灌注分析示22例VBD中11例出现后循环灌注异常（占50%），主要表现为不同程度对比剂达峰时间（TTP）延长，严重者还伴有平均通过时间（MTT）缩短、局部脑血流量（rCBF）增加及脑梗死灶的出现。后循环灌注异常组的BA位置评分、BA内径与灌注表现正常组之间有显著性差异（Mann-Whitney U检验，P<0.05）。结论：对于VBD患者，动态容积CT一站式检查能全面评价椎基底动脉形态的异常和后循环脑组织的灌注状态。

Objective: To evaluate value of dynamic volume CT(DVCT) using “a one-stop protocol for stroke” in the diagnosis of vertebrobasilar dolichoectasia(VBD). Methods: Twenty two patients(male/female=16/6, aged 39~79 years old) with DVCT-confirmed VBD were included into this study. For each patient with VBD, the location score and height score of basilar artery(BA) were determined and the BA diameter were measured in a post-processing workstation, as well perfusion status of the posterior circulation area were evaluated using a whole-brain perfusion analysis software. Results: Of 22 patients, the BA diameter was (6.12±1.73) mm on average(range 3.9~10.1 mm), the averaged BA height and location score were 2.32±0.48 and 2.32±0.78(range 1 to 3) respectively. Posterior-circulation abnormal perfusion were detected in 11 patients with VBD(50%), which was characterized by inordinately increased TTP, and increased rCBF and contracted MTT and presence of brain infarct lesions in serious cases. Between normal perfusion in posterior-circulation area and abnormal perfusion groups, there have significant difference both the BA position score and BA diameter(Mann-Whitney U test, P<0.05). Conclusion: For patients with VBD, DVCT examination could well demonstrate the morphologic abnormality in vertebrobasilar arteries and abnormal perfusion in posterior circulation.