目的 探究能谱CT最佳单能量图对提高下肢动脉造影成像质量的应用价值。方法 此次研究选择我院在2014年3月到 2017年3月期间收治的72例下肢动脉硬化闭塞症（LEAOD）患者作为研究对象，用数字法分为实验组与对照组，每 组各36例患者，实验组患者采用美国GE公司生产的能谱宝石CT750HD扫描检查，对照组患者采用64排螺旋CT扫描检 查，对比两组患者的图像中的髂总动脉、股浅动脉、腘动脉及胫前动脉中段平面声值BN以及噪声比CNR。结果 实验 组患者图像中髂总动脉、股浅动脉、腘动脉及胫前动脉中段平面声值BN以及噪声比CNR与对照组相比，差异均具有 统计学意义（P＜0.05）。结论 下肢动脉造影成像中，使用宝石能谱CT最佳单能量图能够更加清晰地显示狭窄段血 管、远端小血管，同时去硬化伪影的能力也较高，应在临床实践中积极推广。

Objective To explore the best single energy spectrum CT diagram of application value to improve the quality of lower extremity artery angiography. Methods 72 cases of lower extremity arteriosclerosis of the study in our hospital from March 2014 to March 2017 were occlusive disease (LEAOD) patients as the research object, using the digital method is divided into experimental group and control group. 36 patients in each group, the experimental group were treated with CT750HD scanning spectrum gem produced by the GE company and the control group were treated by 64 slice spiral CT scan, the image of the two groups were compared in the iliac artery, superficial femoral artery, popliteal artery and anterior tibial artery middle plane acoustic noise ratio value BN and CNR. Results The total iliac artery of patients in the experimental group in the image, the superficial femoral artery, popliteal artery and anterior tibial artery middle plane acoustic noise ratio value BN and CNR compared with the control group, the differences were statistically significant (P<0.05). Conclusion In limb angiography imaging, the best single energy map of gem spectrum CT can display more clearly the stenosis segment vessels, the distal small vessels and the ability to harden artifact, and should be actively promoted in clinical practice