Willoteaux S, Sibileau E, Caroff J, Nedelcu C, Abi Kalil W, Delepine S, Thouveny F
Service de Radiologie, Hôpital Larrey, CHU d'Angers, Angers, France.
J Radiol. 2010 Nov;91(11 Pt 2):1220-4. doi: 10.1016/s0221-0363(10)70177-3.
Dose delivery during CT coronary angiography with retrospective ECG gating is high especially due to the important slice overlapping. Optimization of the acquisition parameters is necessary to reduce patient exposure. First, the height of the scan field should be limited to the heart. Both kV and mA should be adjusted based on patient morphology. ECG gated exposure modulation with mA reduction during systole, a technique most applicable for patients with slow and regular heart rate, can result in a dose reduction up to 50%. The use of prospective ECG gating can also reduce patient dose. This technique also requires patients with slow and regular heart rate.
在回顾性心电图门控的CT冠状动脉造影期间，由于重要的层面重叠，剂量输送很高。优化采集参数对于减少患者辐射剂量是必要的。首先，扫描野的高度应限制在心脏范围。千伏（kV）和毫安（mA）都应根据患者体型进行调整。在收缩期通过毫安降低进行心电图门控曝光调制，这一技术最适用于心率缓慢且规律的患者，可使剂量降低达50%。使用前瞻性心电图门控也可减少患者剂量。该技术同样需要心率缓慢且规律的患者。
