目的 研究实时阈值手动触发技 术在多排螺旋CT下肢动脉成像中的临床 效果及应用价值，为临床提供依据。方 法 选取2015年1月-2016年5月医院诊治 的疑似下肢动脉病变患者70例，根据检 测方法不同将患者分为对照组35例和观 察组35例。对照组采用手动触发，待时 间密度曲线图到峰值稳定后手动启动扫 描，观察组采用实时阈值手动触发技术 待阈值达到150Hu后延迟6s启动扫描， 比较两组图像质量。结果 观察组患者 诊断时平均延迟时间，显著短于对照组 (P<0.05)；两组患者主-髂部血管、骨腘部血管动脉边缘及动脉分支图像质量 评分差异无统计学意义(P>0.05)；观察 组膝下部血管、足部血管动脉边缘及动 脉分支图像质量评分，显著高于对照组 (P<0.05)；两组患者髂总动脉、股腘动 脉、胫前动脉及足背动脉静脉干扰评分 差异无统计学意义(P>0.05)。结论 疑 似下肢动脉病变患者采用实时阈值手动 触发技术诊断效果理想，能延迟扫描时 间，提高下肢动脉图像，值得推广应 用。

Objective To study the real-time triggering threshold value manually clinical effect and value of multi-slice spiral CT in lower extremity arteries imaging for clinical basis. Methods January 2015-May 2016 suspected of 70 cases of lower extremity arterial disease patients to hospital for treatment, the patients were divided into different control group of 35 cases and 35 cases of observation group according to the detection method. The control group was triggered manually, until the time density curve to a peak steady manually initiate a scan， real-time observation group threshold value manually triggering threshold to be reached 150Hu delay 6s start scanning, image quality between the two groups. Results The observed cohort, average delay time was significantly shorter than the control group (P<0.05), two groups were the main-iliac vessels, bone-popliteal artery and arteries edge image quality score difference was not statistically significant (P>0.05), the observation group blood vessels below the knee, foot and edge arteries artery image quality score was significantly higher (P<0.05), two groups were common iliac artery, femoral popliteal artery, anterior tibial artery and foot dorsal artery vein interference score was no significant difference (P>0.05). Conclusion Patients with suspected lower extremity arterial disease by real-time triggering threshold value manually over the diagnosis can be delayed scan time and improve the image of lower extremity arteries, should be widely applied.