目的探讨CT平扫检测短暂性脑缺血发作(TIA)患者颈内动脉虹吸部钙化与MSCTA显示颈动脉分叉处狭窄的关系。方法对84例同时行CT平扫及MSCTA检查的TIA患者影像资料进行回顾性分析,根据MSCTA图将颈动脉分叉处狭窄分为无狭窄、轻度狭窄(0-49%)、中度狭窄(50-69%)、重度狭窄(70-99%)、闭塞(100%)五种;根据平扫CT图将颈内动脉虹吸部钙化分为0-4级,0级为无钙化,1级为点状钙化,2级为(弧形钙化占管壁的范围)<90°,3级90-270°,4级>270°,0-1级为低级别钙化,2-4级为高级别钙化,分析虹吸部钙化、钙化形态与颈动脉分叉处狭窄的关系。结果 84例患者中,左侧、右侧及混合组狭窄发生率为43%、43%及58%;颈动脉虹吸部有钙化且钙化范围越大高度提示颈动脉分叉处狭窄,诊断具有较高的敏感性(73%)和特异性(71%);虹吸部没有钙化的颈动脉较少发生中度或重度的狭窄,即狭窄程度超过50%(诊断特异度100%);虹吸部钙化无法有效预测颈动脉中度和重度狭窄,诊断敏感性为5.8%。结论虹吸部钙化及钙化范围可以作为TIA患者预测颈动脉分叉处狭窄的两项指标。 Objective To investigate the relationship between calcification of siphon department of carotid artery and stenosis of carotid bifurcation in patients with transient ischemic attack (TIA) by CT plain scan. Methods Totally 84 patients with TIA undergoing both CT scan and MSCTA were retrospectively analyzed. According to MSCTA maps, the carotid bifurcation stenosis was divided into no stenosis, mild stenosis (0-49%), moderate stenosis (50-69%), severe stenosis (70-99%) and occlusion (100%). The carotid stenosis of carotid artery was divided into 0-4 grade according to plain CT scan. Grade 0 was no calcification, 1 Grade 2 was calcification, Grade 2 was (arcuate calcification accounting for the extent of the wall) <90 °, grade 3 was 90-270 °, grade 4 was> 270 °, grade 0-1 was low grade calcification, grade 2-4 was High-grade calcification, siphon calcification, calcification morphology and carotid bifurcation stenosis relationship. Results Among the 84 patients, the incidence of stenosis was 43%, 43% and 58% in the left and right sides and in the mixed group. Carotid siphon was calcified and the calcification range was highly suggestive of stenosis of carotid artery. High sensitivity (73%) and specificity (71%); stenosis of carotid arteries in the siphon with less or less severe stenosis, ie, stenosis of more than 50% (diagnostic specificity of 100%); siphon calcification Can not effectively predict moderate and severe carotid stenosis, the diagnostic sensitivity was 5.8%. Conclusion The range of calcification and calcification of siphon can be used as two indexes for predicting the stenosis of carotid bifurcation in patients with TIA.