Department of Cardiology, Chinese PLA General Hospital, Beijing, 100853, China.
Int J Cardiovasc Imaging. 2013 Aug;29(6):1341-9. doi: 10.1007/s10554-013-0203-0. Epub 2013 Mar 8.
To evaluate the feasibility and imaging quality of double prospectively ECG-triggered high-pitch spiral acquisition mode (double flash mode) for coronary computed tomography angiography (CTCA) in patients with atrial fibrillation (AF). 47 patients (11 women, 36 men; mean age 64.5 ± 12.1 years) were enrolled for CTCA examinations using a dual-source CT with 2 × 128 × 0.6 mm collimation, 0.28 s rotation time and a pitch of 3.4. Double flash mode was prospectively triggered first at 60 % and later at 30 % of the R-R interval within two cardiac cycles. Image quality was evaluated using a four-point scale (1 = excellent, 4 = non-assessable). From 672 coronary artery segments, 77.5 % (521/672) was rated as score of 1, 20.8 % (140/672) as score of 2, 1.2 % (8/672) as score of 3 and 0.4 % (3/672) was rated as 'non-assessable'. The average image quality score was 1.25 ± 0.38 on a per segment basis. Mean dose-length product for CTCA was 92.6 ± 28.2 mGy cm, the effective dose was 1.30 ± 0.39 mSv (0.64-1.97 mSv). In patients with AF, double prospectively ECG-triggered high-pitch spiral acquisition mode could be a feasible and valuable scan mode for CTCA with a consistent dose below 2 mSv as well as diagnostic imaging quality.
评估双前瞻性心电图触发高螺距螺旋采集模式（双闪模式）在心房颤动（AF）患者冠状动脉 CT 血管造影（CTCA）中的可行性和成像质量。47 名患者（11 名女性，36 名男性；平均年龄 64.5 ± 12.1 岁）接受了使用双源 CT 进行的 CTCA 检查，该 CT 具有 2×128×0.6mm 准直器、0.28s 旋转时间和 3.4 的螺距。双闪模式在两个心动周期内前瞻性地首先在 R-R 间隔的 60%和 30%处触发。使用四点量表（1=优秀，4=不可评估）评估图像质量。从 672 个冠状动脉节段中，77.5%（521/672）评为 1 分，20.8%（140/672）评为 2 分，1.2%（8/672）评为 3 分，0.4%（3/672）评为“不可评估”。每个节段的平均图像质量评分为 1.25±0.38。CTCA 的平均剂量长度乘积为 92.6±28.2mGycm，有效剂量为 1.30±0.39mSv（0.64-1.97mSv）。在 AF 患者中，双前瞻性心电图触发高螺距螺旋采集模式可能是一种可行且有价值的 CTCA 扫描模式，其剂量低于 2mSv，且具有诊断成像质量。
