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目的探讨64层螺旋CT血管成像(CTA)对肝动脉正常解剖和变异的评估作用。方法上腹部多层螺旋CT三期扫描患者500例,将动脉期原始数据进行薄层重建。采用多平面重建(MPR),最大密度投影(MIP)和容积再现(VR)后处理技术,根据Michel′s分型标准对肝动脉解剖变异进行分析。结果500例患者中,Michel′sⅠ型300例(60.0%)[肝动脉变异者为200例(40.0%)],Ⅱ型40例(8.0%),Ⅲ型42例(8.4%),Ⅳ型10例(2.0%),Ⅴ型28例(5.6%),Ⅵ型30例(6.0%),Ⅶ型18例(3.6%),Ⅷ型6例(1.2%),Ⅸ型8例(1.6%),Ⅹ型6例(1.2%);另外12例肝动脉变异不在Michel′s分型中(2.4%)。结论多层螺旋CT血管成像作为非损伤性检查方法对肝动脉解剖变异分型具有指导意义。
Objective To evaluate the evaluation of normal anatomy and variation of hepatic artery by 64-slice spiral CT angiography (CTA). Methods 500 cases of triple-phase CT scan of upper abdomen were performed. The original data of arterial phase were reconstructed by thin layer. Anatomical variation of hepatic artery was analyzed according to Michel’s classification standard by MPR, MIP and VR postprocessing. Results Among the 500 patients, there were 300 cases (60.0%) of Michel’s type Ⅰ [200 cases (40.0%) in hepatic artery variability], 40 cases (8.0%) of type Ⅱ and 42 cases (8.4%) of type Ⅲ 18 cases (3.6%) were type Ⅵ, 6 cases were type Ⅷ (1.2%), 8 cases were type Ⅵ (1.6%), 28 cases were type Ⅴ (5.6% ), Type X 6 cases (1.2%); the other 12 cases of hepatic artery variability are not Michel’s classification (2.4%). Conclusion Multi-slice spiral CT angiography is instructive for the classification of hepatic artery anatomy variation as a noninvasive method.