双源CT自适应前瞻性心电门控冠状动脉成像技术的初步应用

目的：初步探讨双源CT前瞻性心电门控冠状动脉成像的图像质量和辐射剂量。方法：对50例临床怀疑冠心病的受检者进行双源CT自适应前瞻性门控冠状动脉成像,检查前均未服用琥珀酸美托洛尔。图像质量分4级,依照美国心脏病协会（AHA）冠状动脉分段标准分别评价各个冠状动脉节段的图像质量,分别计算每例的有效辐射剂量（ED）。结果：50例受检者平均体重指数（BM I）为（25.00±2.58）kg/m2,扫描时平均心率（71.13±9.63）次/min,平均有效辐射剂量（3.31±1.08）mSv,显示了94.76%能满足诊断要求的冠状动脉节段,图像质量优秀占79.49%。结论：双源CT自适应前瞻性心电门控冠状动脉成像对于无严重心律失常的受检者都可得到满足诊断要求的图像,辐射剂量低,具有广阔的应用前景。

Dual-source CT coronary angiography with prospective electrocardiography-gated adaptive cardio sequence mode

Objective：To investigate the image quality and radiation dose of dual-source CT（DSCT） coronary angiography with prospective electrocardiography（ECG）-gated adaptive cardio sequence（ACS） mode.Methods：The DSCT coronary angiography with ACS protocol was performed in 50 patients with suspected coronary artery disease,without administration of metoprolol succinate.The images quality was classified into 4 grades,and the coronary segments based on American Heart Association（AHA） standard were independently assessed.The effective radiation dose was calculated.Results：In the 50 patients,the mean body mass index was 25.00±2.58 kg/m2,the mean heart rate during scan was 71.13±9.63,and the mean effective dose was 3.31±1.08 mSv.The diagnostic image quality was obtained in 94.76% of coronary segments,in which 79.49% was excellent.Conclusion：The DSCT coronary angiography with ECG-gated ACS mode can obtain diagnostic image quality at a low radiation dose for majority of coronary segments without serious cardiac arrhythmias.