Adequate image quality with reduced radiation dose in prospectively triggered coronary CTA compared with retrospective techniques
Adequate image quality with reduced radiation dose in prospectively triggered coronary CTA compared with retrospective techniques
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DOI：
10.1007/s00330-009-1411-9
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发表时间：
2009-09-01
影响因子：
5.9
通讯作者：
Nikolaou, Konstantin
中科院分区：
文献类型：
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作者：
Arnoldi, Elisabeth;Johnson, Thorsten R.;Nikolaou, Konstantin
我们研究的目的是比较前瞻性触发（PT）CT技术与回顾性门控（RG）CT技术在冠状动脉计算机断层扫描血管造影（CCTA）中的图像质量和辐射剂量。入组了60例连续患者。在40例患者中使用双源64层CT系统，使用ECG触发管电流调制，在RR间期的30-80%（RGb组，20例患者，心率> 70 bpm）处使用宽脉冲窗口或在70%（RGs组，20例患者，心率< 70 bpm）处使用小脉冲窗口，获得使用RG技术的CCT。另20例患者在128层CT系统上使用PT技术进行CCTA（PT组，心率< 70 bpm）。所有图像均由两名观察员在三分量表上进行质量评价，1分为优秀，3分为不足。计算每例患者的有效辐射剂量。PT的平均图像质量评分为1.5 +/- 0.6，RG为1.35 +/- 0.5，RGb为1.65 +/- 0.5。RGb的平均有效剂量为9 +/- 4 mSv，RGs为7 +/- 3 mSv，PT为3 +/- 1 mSv。这表示与RG相比，PT剂量减少57%，与RGb相比，PT剂量减少67%。总之，在选定的患者中，与使用RG技术的CCTA相比，使用PT技术的CCTA提供了足够的图像质量和显著更低的辐射剂量。
The goal of our study was to compare a prospective triggering (PT) CT technique with retrospectively gated (RG) CT techniques in coronary computed tomographic angiograms (CCTA) with respect to image quality and radiation dose. Sixty consecutive patients were enrolled. CCTAs using the RG technique were obtained with a dual-source 64-slice CT system in 40 patients, using ECG-triggered tube current modulation, with either a broad pulsing window at 30-80% of the RR interval (group RGb, 20 patients, heart rate > 70 bpm) or a small pulsing window at 70% (group RGs, 20 patients, heart rate < 70 bpm). The other 20 patients underwent CCTA using the PT technique on a 128-slice CT system (group PT, heart rate < 70 bpm). All images were evaluated by two observers for quality on a three-point scale, with 1 being excellent and 3 being insufficient. The effective radiation dose was calculated for each patient. The average image quality score was 1.5 +/- 0.6 for PT, 1.35 +/- 0.5 for RGs and 1.65 +/- 0.5 for RGb. The mean effective dose for RGb was 9 +/- 4 mSv, for RGs 7 +/- 3 mSv and for PT 3 +/- 1 mSv. This represents a 57% dose reduction for PT compared with RGs and a 67% dose reduction for PT compared with RGb. In conclusion, in selected patients CCTA with the PT technique offers adequate image quality with a significantly lower radiation dose compared with CCTA using RG techniques.