Effect of acquisition technique on radiation dose and image quality in multidetector row computed tomography coronary angiography with submillimeter collimation
Effect of acquisition technique on radiation dose and image quality in multidetector row computed tomography coronary angiography with submillimeter collimation
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DOI：
10.1097/01.rli.0000170628.69792.cb
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发表时间：
2005-08-01
影响因子：
6.7
通讯作者：
Morin, RL
中科院分区：
文献类型：
--
作者：
Gerber, TC;Stratmann, BP;Morin, RL
基本原理和目标：我们试图检查管电压和电流对16层多探测器行计算机断层扫描（MDCT）扫描仪进行微创冠状动脉造影的辐射剂量和图像质量的影响。材料和方法：我们在管电压为80和120 kVp、550、650和750 mAs（eff）下扫描了美国放射学会计算机断层扫描认证项目中使用的体模，结果：在无心电脉冲的情况下，有效剂量为3 ~ 13 mSv。平均而言，管电压增加50%会导致辐射剂量增加（215%）、对比度噪声比增加（150%）和图像噪声降低（-48%）。平均而言，mAs（eff）增加17%会导致辐射剂量（17%）和对比度噪声比（4%）增加以及图像噪声降低（-9%）。通过ECG脉冲（模拟心率，70次/分钟）减少剂量28%。随着心电脉冲，在心室收缩期重建的图像中的噪声是在心室收缩期重建的图像中的噪声的两倍。结论：这些定量结果之间的关系，扫描采集参数，辐射剂量和图像质量有实际意义，使用心电脉冲，以减少辐射剂量在MDCT冠状动脉造影。
Rationale and Objectives: We sought to examine effects of tube voltage and current on radiation dose and image quality for minimally invasive coronary angiography with a 16-slice multidetector row computed tomography (MDCT) scanner.Materials and Methods: We scanned the phantom used in the American College of Radiology Computed Tomography Accreditation Program at tube voltages of 80 and 120 kVp at 550, 650, and 750 mAs(eff), with and without a reduction in radiation dose by electrocardiographically (ECG) controlled tube current modulation (ECG pulsing).Results: Without ECG pulsing, the effective dose was 3 to 13 mSv. On average, a 50% increase in tube voltage led to increased radiation dose (215%), contrast-to-noise ratio (150%), and decreased image noise (-48%). On average, a 17% increase in mAs(eff) led to increased radiation dose (17%) and contrast-to-noise ratio (4%) and decreased image noise (-9%). Dose reduction by ECG pulsing (simulated heart rate, 70 beats per minute) was 28%. With ECG pulsing, noise in images reconstructed during ventricular systole was double that in images reconstructed during ventricular diastole.Conclusions: These quantitative findings about the relationships among scan acquisition parameters, radiation dose, and image quality have practical implications for using ECG pulsing to reduce radiation doses in MDCT coronary angiography.