Department of Diagnostic Radiology, Kitasato University School of Medicine, Sagamihara 252-0374, Japan.
Department of Radiology, Kitasato University Hospital, Sagamihara 252-0375, Japan.
Tomography. 2023 Jul 14;9(4):1381-1392. doi: 10.3390/tomography9040110.
We investigated the relationships between radiation dose indices and body size indices in adult body computed tomography (CT). A total of 3200 CT scans of the thoracic, abdominal, abdominopelvic, or thoraco-abdominopelvic regions performed using one of four CT scanners were analyzed. Volume CT dose index (CTDIvol) and dose length product (DLP) were compared with various body size indices derived from CT images (water-equivalent diameter, WED; effective diameter, ED) and physical measurements (weight, weight/height, body mass index, and body surface area). CTDIvol showed excellent positive linear correlations with WED and ED. CTDIvol also showed high linear correlations with physical measurement-based indices, whereas the correlation coefficients were lower than for WED and ED. Among the physical measurement-based indices, weight/height showed the strongest correlations, followed by weight. Compared to CTDIvol, the correlation coefficients with DLP tended to be lower for WED, ED, and weight/height and higher for weight. The standard CTDIvol values at 60 kg and dose increase ratios with increasing weight, estimated using the regression equations, differed among scanners. Radiation dose indices closely correlated with body size indices such as WED, ED, weight/height, and weight. The relationships between dose and body size differed among scanners, indicating the significance of dose management considering body size.
我们研究了成人体计算机断层扫描（CT）中辐射剂量指标与体型指标之间的关系。对使用四台 CT 扫描仪中的一台进行的 3200 例胸部、腹部、腹盆腔或胸腹盆腔区域 CT 扫描进行了分析。体积 CT 剂量指数（CTDIvol）和剂量长度乘积（DLP）与从 CT 图像（水当量直径，WED；有效直径，ED）和体格测量（体重、体重/身高、体重指数和体表面积）得出的各种体型指标进行了比较。CTDIvol 与 WED 和 ED 呈良好的正线性相关。CTDIvol 与基于体格测量的指标也显示出高度的线性相关性，但其相关系数低于 WED 和 ED。在基于体格测量的指标中，体重/身高与 CTDIvol 的相关性最强，其次是体重。与 CTDIvol 相比，WED、ED 和体重/身高的相关系数与 DLP 的相关系数较低，而体重的相关系数较高。使用回归方程估算的 60kg 标准 CTDIvol 值和体重增加时的剂量增加率在不同扫描仪之间存在差异。辐射剂量指标与 WED、ED、体重/身高和体重等体型指标密切相关。剂量与体型之间的关系在不同的扫描仪之间存在差异，这表明考虑体型进行剂量管理的重要性。
