目的 探讨CTA对下肢动脉硬化闭 塞症支架内再狭窄的评估价值。方法 对 25例下肢动脉硬化闭塞症支架置入术后发 生支架内再狭窄的患者(共34枚支架)行下 肢动脉CTA检查和DSA检查，采用最大密度 投影(MIP)、多平面重建(MPR)、曲面重建 (CPR)和容积再现(VR)等4种血管重建技 术，并与DSA 检查结果进行对比分析。结 果 全部34枚支架中CTA显示支架内中度狭 窄6枚，重度狭窄17枚，完全闭塞11枚。 在评估下肢动脉硬化闭塞症支架内再狭窄 上，CTA与DSA具有极高的一致性。结论 CTA能够准确显示下肢动脉硬化闭塞症支 架内再狭窄的程度，可作为支架术后随访 及治疗方案制定的依据。

Objective To investigate the evaluation of CT angiography for Stent restenosis in lower extremity arterial occlusive diseases. Methods CTA examination and DSA examination of lower extremity artery were performed in 25 patients with stent restenosis after stent implantation with lower extremity arteriosclerosis obliterans, a total of 34 stents involved. Post-processing techniques including multi-planar reformation (MPR), maximum intensity projection (MIP), curved planar reconstruction (CPR)and volume rendering (VR) were performed. And the results were comparatively analyzed with DSA. Results Of the 34 stents, CTA showed moderate stenosis in 6 stents, severe stenosis in 17 stents, and complete occlusion in 11stents. 32 patients (40 stents in total) underwent DSA in 2 weeks after CTA. The consistent rate of CTA was 95.0 %, compared with DSA. Conclusion CTA can clearly display the vascular conditions after stenting in lower extremity arterial occlusive diseases, and can be used as the basis of stent follow-up and treatment program development.