Study of prospective ECG-triggered for 256-slice CT coronary artery angiography

Objective: To compare the image quality and patient radiation dose between prospective ECG-triggered and retrospective ECG-gated CT coronary angiography (CTCA) by using 256-slice CT. Methods: A total of 200 patients were enrolled in this study. All patients with an average heart rate (HR) ≤70 bpm, 100 patients were scanned by using prospective ECG-triggered and 100 patients by retrospective ECG-gated with 256-slice CT, The image quality and the radiation dose were compared in two groups. Results: of 800 coronary artery, excellentor good image quality was achieved in 96.2%(385/400) in group A, 97.3%(389/400) in group B, with no significant difference for A vs B. The average radiation dose in group A [(2.9±0.5)mSv] reduced 73% comparing with that in group B[(10.2±2.4)mSv]. Conclusion: Using prospective ECG-triggered to perform CCTA with 256-slice CT could keep the image quality and reduce radiation dose significantly.