前瞻性心电触发扫描模式应用于心律不齐患者冠状动脉CTA检查的可行性研究

目的：探讨心律不齐患者采用前瞻性心电触发扫描模式行冠状动脉CTA检查的可行性。方法：回顾性搜集本院行冠状动脉CTA检查的13例心律不齐患者的病例资料。所有患者均行双源CT扫描结合前瞻性心电触发扫描模式，每个R波后250～350ms采集，管电压120kVp，自动毫安。对比剂采用碘克沙醇（270mgI／mL），注射30mL。记录所有患者的辐射剂量。将冠状动脉分为15个节段，由2名影像科医师进行图像质量评价，并测量cT值。对结果进行统计学分析。结果：13例患者均一次完成检查，平均有效辐射剂量为（2．61±1．29）mGy。主观评估了冠状动脉CTA的172个节段，有163个节段达到诊断要求，94．77％满足临床诊断要求。80．12％的节段管腔内CT值〉250HU。结论：心律不齐患者应用前瞻性心电触发扫描模式时，行冠状动脉cTA检查可以得到较好的图像质量，基本满足临床诊断要求。

Feasibility study of prospective ECG-triggered coronary CT angiography for arrhythmia patients using dual source CT

Objective：To evaluate the feasibility of prospective ECG-triggered coronary CT angiography （CCTA） for arrhythmia patients using dual source CT and iodixanal （270mg I/mI.）. Methods：Data of 13 patients with arrhythmia who underwent coronary CTA were recruited. CCTA images were ohtained with prospective ECG-triggered CT protocol using dual source CT. The scanning parameters were as follow： 120kVp,automatic mA;iodixanol （270mg I/mL）,volume 60mL. Two radiologists assessed image quality of the coronary artery and measured the CT value of vessel lumen. Results：The av erage effective dose was （2.61 ±1.29）mGy. The image quality of 94.77± （163/172） coronary vessel segments was considered to be good enough for diagnosis. The CT value in 80. 12%segments was more than 250HU. Conclusion： Using dual source CT,CCTA images can be acquired by prospective ECG-triggered protocol and iodixanol （270mg I/mL） for arrhyth- mia patients,which can meet clinical diagnosis criteria.