Radiation dose estimates from cardiac multislice computed tomography in daily practice -: Impact of different scanning protocols on effective dose estimates
Radiation dose estimates from cardiac multislice computed tomography in daily practice -: Impact of different scanning protocols on effective dose estimates
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DOI：
10.1161/circulationaha.105.602490
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发表时间：
2006-03-14
期刊：
影响因子：
37.8
通讯作者：
Schömig, A
中科院分区：
文献类型：
--
作者：
Hausleiter, J;Meyer, T;Schömig, A
背景-多层计算机断层血管造影（CTA）是一种很有前途的技术，用于成像疑似冠状动脉疾病的患者。与16层CTA相比，64层CTA的时空分辨率（0.6 mm与1.0 mm厚度、330 ms与420 ms龙门旋转时间）的提高与辐射剂量的增加有关。本回顾性研究的目的是比较16层和64层CTA在日常实践中的估计剂量，并研究不同扫描方案对剂量和图像质量的影响。方法和结果-对1035例接受冠状动脉CTA的患者进行辐射剂量估计。研究了有和没有ecg依赖剂量调制和降低管电压的扫描算法对剂量估计和图像质量的影响。在整个患者队列中，16层和64层CTA的辐射剂量估计值分别为6.4 +/- 1.9和11.0 +/- 4.1 mSv （P < 0.01）。使用ecg依赖性剂量调制和同时使用剂量调制和降低管电压时，辐射剂量估计值的降低幅度分别在37%至40%和53%至64%之间。通过信噪比和具有诊断图像质量的冠状动脉段频率来评估，剂量估计值的降低与诊断图像质量的降低无关。结论：64层CTA空间和时间分辨率的提高与冠状动脉CTA辐射剂量的增加有关。剂量节约算法在减少辐射照射方面非常有效，应尽可能使用。
Background - Multislice computed tomography angiography (CTA) is a promising technology for imaging patients with suspected coronary artery disease. Compared with 16-slice CTA, the improved spatial and temporal resolution of 64-slice CTA (0.6-versus 1.0-mm slice thickness and 330- versus 420-ms gantry rotation time) is associated with an increase in radiation dose. The objective of this retrospective investigation was to compare the estimated dose received during 16- and 64-slice CTA in daily practice and to investigate the impact of different scan protocols on dose and image quality.Methods and Results - Radiation dose was estimated for 1035 patients undergoing coronary CTA. Scanning algorithms with and without an ECG-dependent dose modulation and with a reduced tube voltage were investigated on dose estimates and image quality. In the entire patient cohort, radiation dose estimates were 6.4 +/- 1.9 and 11.0 +/- 4.1 mSv for 16- and 64- slice CTA, respectively (P < 0.01). The reduction in radiation dose estimates ranged between 37% and 40% and between 53% and 64% with the use of ECG-dependent dose modulation and with the combined use of the dose modulation and a reduced tube voltage, respectively. The reduction in dose estimates was not associated with a reduction in diagnostic image quality as assessed by the signal-to-noise ratio and by the frequency of coronary segments with diagnostic image quality.Conclusions - The increase in spatial and temporal resolution with 64- slice CTA is associated with an increased radiation dose for coronary CTA. Dose-saving algorithms are very effective in reducing radiation exposure and should be used whenever possible.