目的 对比研究多排螺旋增强血 管造影CTA和自动移床三维动态增强磁共 振血管造影3D CE-MRA对诊断下肢动脉硬 化闭塞症的应用价值。方法 收集2012年 5月-2014年11月共38例下肢动脉硬化闭 塞症患者，每例患者在不超过2周期间内 都进行了HD750 CTA和3.0T 3D CE-MRA检 查，其中15例同期进行了DSA检查。回复 性分析相关患者影像数据，并对每例双 侧下肢动脉划分为3个区域、23个节段的 CTA和CE-MRA进行多种后重建图像进行比 较。结果 全部病例的CTA和CE-MRA均可以 准确评估下肢动脉硬化闭塞部位及程度， 共显示轻度狭窄 8例，中度狭窄14例，重 度狭窄12例和4例动脉闭塞，符合临床诊 断要求。MRA对狭窄程度评估更准确，CTA 对于附壁斑块的显示及斑块成分的评估有 优势。结论 CTA和3D CE-MRA对诊断下肢 动脉硬化闭塞症的的评估都是可靠和准确 的，二者各有优势，互补使用可为临床提 供更多的诊断信息，能够为临床采取及时 有效的治疗提供更准确可靠的影像依据。

Objective To evaluate the study value of multi-slices helical CT angiography and three dimensional dynamic contrast-enhanced MRA in lower extremities arteriosclerotic occlusion disease(ASO). Methods 38 cases of ASO were performed with MS CTA and 3D CE-MRA between two weeks. The CT original axial data was reconstructed by ADW4.6 workstation of MPR, MIP and VR, compared with processed MIP images with MRI. Bilateral lower extremity arterial vascular system of each case was divided into three regions and 23 segments, each segment was evaluated for the presence and degree of vascular stenosis. Results All the 38 cases including 8 cases with mild stenosis, 14 cases with moderate syenosis, 12 cases with significant stenosis and 4 cases with occlusion. The significant disease of the lower extremities were demonstrated clearly by MS CTA and 3D CE-MRA. Conclusion MS CTA and 3D CE-MRA are excellent in patients with clinical symptoms of the arteriosclerotic occlusive disease of lower extremity, which can provide more accurate informations for clinical diagnosis and treatment.