目的 探讨超声多普勒设备引导 下冠脉CT造影效果。方法 选取2016年2 月-2017年2月于我院行CCTA检查的疑诊为 冠状动脉疾病者116例为研究对象。采用 随机数字表法将患者分为观察组和对照 组。对照组行传统前瞻性心电门控CCTA检 查，观察组行超声多普勒设备引导下的 CCTA检查。结果 116例受检者1672个冠状 动脉节段中，其中78个节段因血管细小未 纳入统计，剔除后共对1594个节段进行分 析。两组图像质量得分比较差异无统计学 意义(P>0.05)。对患者、分支、节段冠状 动脉病变，对照组和观察组的敏感性、特 异性、阳性预测值、阴性预测值和诊断准 确性之间差异无统计学意义(P>0.05)。观 察组辐射剂量(2.15±0.36)mSv显著低于 对照组(9.75±0.92)mSv(P<0.05)。结论 与传统前瞻性心电门控方法相比，多普勒 引导下的前瞻性心电门控在确保诊断准确 率和图像质量的同时，可以进一步降低有 效辐射剂量。

Objective To evaluate the effect of CT on the coronary angiography guided by Doppler ultrasound. Methods A total of 116 patients with coronary artery disease who were examined by CCTA in February 2016 to February 2017 were selected as the study subjects. Patients were divided into observation group and control group by random number table method. The control group underwent CCTA examination with traditional prospective ECG gating, and the CCTA was examined under the guidance of ultrasonography. Results Among the 1672 coronary arteries in 116 subjects, 78 segments were not included in the statistics because of the small blood vessels, and 1594 segments were analyzed after removal. There was no significant difference between the two groups in the image quality score (P>0.05). There was no significant difference in sensitivity, specificity, positive predictive value, negative predictive value and diagnostic accuracy between the patients, the branch, the segmental coronary artery lesion, the control group and the observation group (P>0.05). The radiation dose (2.15±0.36) mSv in the observation group was significantly lower than that in the control group (9.75±0.92) mSv (P<0.05). Conclusion Compared with the traditional prospective ECG gating method, Doppler-guided prospective ECG gating can further reduce the effective radiation dose while ensuring the diagnostic accuracy and image quality.