Department of Radiology, Hiroshima University, Kasumi-cho, Minami-ku, Japan.
Acad Radiol. 2012 Nov;19(11):1402-7. doi: 10.1016/j.acra.2012.07.003. Epub 2012 Aug 25.
The aim of this study was to compare the calcium score and reproducibility of coronary artery calcium scores obtained on the four kinds of 64-detector computed tomography (CT) scanners using standard (120 kVp) and low tube voltage (80 kVp) scan techniques.
We scanned 80 and 120 kVp on all scanners. We calculated Agatston, volume, and mass scores for coronary artery calcium scoring on each scanner and compared the coefficients of variation of the calcium scores to evaluate reproducibility of among CT scanners.
The averages of the total mean Agatston score, total mean volume score, and total mean mass score at 80 kVp/120 kVp were 798.9/683.8, and 627.2/567.3, and 157.1/156.7, respectively. The total mean mass score was almost constant irrespective of the tube voltage. The total mean coefficients of variation for the four CT scanners were lower at 80 than 120 kVp (4.1% vs. 10.2% [total mean Agatston score], 3.2% vs. 9.6% [total mean volume score], and 3.2% vs. 9.4% [total mean mass score]).
Use of the low tube voltage technique can reduce variations in the coronary artery calcium scores obtained on different CT scanners.
本研究旨在比较使用标准（120 kVp）和低管电压（80 kVp）扫描技术的四种 64 层 CT 扫描仪获得的冠状动脉钙评分和重复性。
我们在所有扫描仪上扫描了 80 和 120 kVp。我们计算了每个扫描仪上的冠状动脉钙评分的 Agatston、体积和质量评分，并比较了钙评分的变异系数以评估 CT 扫描仪之间的可重复性。
80 kVp/120 kVp 时总平均 Agatston 评分、总平均体积评分和总平均质量评分的平均值分别为 798.9/683.8 和 627.2/567.3，以及 157.1/156.7。总平均质量评分几乎不受管电压的影响。四个 CT 扫描仪的总平均变异系数在 80 kVp 时低于 120 kVp（4.1%对 10.2%[总平均 Agatston 评分]、3.2%对 9.6%[总平均体积评分]和 3.2%对 9.4%[总平均质量评分]）。
使用低管电压技术可以减少不同 CT 扫描仪上获得的冠状动脉钙评分的差异。
