64排多层螺旋CT冠状动脉造影在两种不同扫描延迟触发模式下成像质量的比较

Comparison of image qualities between two different delayed scanning trigger modes in single sourse 64-MDCT coronary angiography

目的探讨扫描延迟触发模式对心电门控下64排螺旋CT(64-MDCT)冠状动脉血管造影(CTA)成像质量的影响。方法收集采用两种模式下完成120例冠状动脉CTA检查图像,分析评价其成像质量差异及失败原因。共120例,A组60采用对比剂小剂量峰值测试扫描延迟触发模式,B组60例采用Smart Prep(对比剂跟踪技术)触发模式。结果质量评分A组达标率99.23%,B组达标率98.55%,两组间差异具有统计学意义(P<0.05)。结论使用小剂量峰值测试扫描延迟触发模式能够明显提高64-MDCT冠状动脉CTA成像质量和检查成功率,是目前回顾性心电门控下该项检查较理想的扫描延迟触发模式,应在临床工作中广泛采用。

Objective To evaluate the influence of the delayed scanning trigger model on the imaging quality in ECG-gating permits 64 multi detector computerized tomography（64-MDCT）coronary angiography（CTA）.Methods 120 cases of coronary artery CTA images by the two delayed scanning trigger modes were collected and evaluated on the images quality and failure causes.The group A（60 cases） adopted the low dose contrast agents peak value delayed scanning trigger mode,and the group B（60 cases） adoptd the automatic following delayed scanning trigger mode.Results The scores of imaging quality and the detection success rate in the group A were significantly superior to those in the group B.Conclusion The low dose-peak value delayed scanning trigger mode can obviously increase the imaging quality and detection success rate and is the more ideal delayed scanning trigger mode in the retrospective ECG-gating permits 64 MDCT,which should be widely applied in clinical work.