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首页> 外文期刊>Acta Radiologica >High-quality low-dose cardiovascular computed tomography (CCT) in pediatric patients using a 64-slice scanner
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High-quality low-dose cardiovascular computed tomography (CCT) in pediatric patients using a 64-slice scanner

机译：使用64切片扫描仪的儿科患者高质量的低剂量心血管计算断层扫描（CCT）

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Background Cardiovascular computed tomography (CCT) technology is rapidly advancing allowing to perform good quality examinations with a radiation dose as low as 1.2 mSv. However, latest generation scanners are not available in all centers. Purpose To estimate radiation dose and image quality in pediatric CCT using a standard 64-slice scanner. Material and Methods A total of 100 patients aged 6.9?±?5.4 years (mean?±?standard deviation) who underwent a 64-slice CCT scan using 80, 100, or 120 kVp, were retrospectively evaluated. Radiation effective dose was calculated on the basis of the dose length product. Two independent readers assessed the image quality through signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and a qualitative score (3?=?very good, 2?=?good, 1?=?poor). Non-parametric tests were used. Results Fifty-five exams were not electrocardiographically (ECG) triggered, 20 had a prospective ECG triggering, and 25 had retrospective ECG triggering. The median effective dose was 1.3 mSv (interquartile range [IQR]?=?0.8–2.7 mSv). Median SNR was 30.6 (IQR?=?23.4–33.6) at 120 kVp, 29.4 (IQR?=?23.7–34.8) at 100 kVp, and 24.7 (IQR?=?19.4–34.3) at 80 kVp. Median CNR was 21.0 (IQR?=?14.8–24.4), 19.1 (IQR?=?15.6–23.9), and 25.3 (IQR?=?19.4–33.4), respectively. Image quality was very good, good, and poor in 56, 39, and 5 patients, respectively. No significant differences were found among voltage groups for SNR ( P ?=?0.486), CNR ( P ?=?0.336), and subjective image quality ( P ?=?0.296). The inter-observer reproducibility was almost perfect (κ?=?0.880). Conclusion High-quality pediatric CCT can be performed using a 64-slice scanner, with a radiation effective dose close to 2?mSv in about 50% of the cases.
机译：背景技术心血管计算断层扫描（CCT）技术正在迅速推进，允许使用低至1.2msV的辐射剂量进行良好的质量检查。但是，所有中心都没有使用最新一代扫描仪。目的使用标准的64切片扫描仪估算小儿CCT中的辐射剂量和图像质量。材料和方法共有100名6.9岁的患者（6.9°（平均值）（平均值？±±标准偏差）进行回顾性地评估使用80,100或120 kVp的64切片CCT扫描。基于剂量长度产品计算辐射有效剂量。两个独立读者通过信噪比（SNR），对比度 - 噪声比（CNR）和定性分数（3？=非常好，2？好，1？=？贫穷的）。使用非参数测试。结果五十五次考试不是心电图（ECG）触发，20个具有潜在的ECG触发，25次追溯ECG触发。中位有效剂量为1.3msv（晶体范围[IQR]？= 0.8-2.7msV）。 MIDIAN SNR为30.6（IQR？= 23.4-33.6），在120 kVP，29.4（IQR？= 23.7-34.8），在100 kVP，24.7（IQR？= 19.4-34.3），80 kVP。中位数CNR是21.0（IQR？=？14.8-24.4），19.1（IQR？=？15.6-23.9），分别为25.3（IQR？= 19.4-33.4）。图像质量非常好，良好，56,39和5名患者分别差。 SNR的电压组中没有发现显着差异（P？= 0.486），CNR（P？= 0.336）和主观图像质量（P？= 0.296）。观察者间的再现性几乎完美（κ？=？0.880）。结论高质量的儿科CCT可以使用64切片扫描仪进行，辐射有效剂量接近2μm的辐射有效剂量在约50％的情况下。

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