Advanced Medical and Dental Institute, Universiti Sains Malaysia, Kepala Batas, 13200 Penang, Malaysia.
Department of Medical Radiography, Faculty of Basic Clinical Sciences, University of Ilorin, 240213 Ilorin, Nigeria.
Radiat Prot Dosimetry. 2022 Oct 1;198(17):1292-1302. doi: 10.1093/rpd/ncac163.
Clinical challenges in pediatrics dose estimation by the displayed computed tomography (CT) dose indices may lead to inaccuracy, and thus size-specific dose estimate (SSDE) is introduced for better-personalized dose estimation. This study aims to estimate pediatric dose adapted to specific size. This retrospective study involved pediatric population aged 0-12 y. SSDE was derived from scanner reported volume CT dose index (CTDIvol), based on individual effective diameter (Deff) with corresponding size correction factors. The correlations of Deff with other associated factors such as age, exposure setting, CTDIvol and SSDE were also studied. The average Deff of Malaysian pediatric was smaller than reference phantom size (confidence interval, CI = 0.28, mean = 14.79) and (CI = 0.51, mean = 16.33) for head and abdomen, respectively. These have led to underestimation of pediatric dose as SSDE was higher than displayed CTDIvol. The percentage differences were statistically significant (p < .001) ranged from 0 to 17% and 37 to 60% for head and abdominal CT, respectively. In conclusion, the clinical implementation of SSDE in pediatric CT imaging is highly relevant to reduce radiation risk.
儿科 CT 剂量指标显示的临床挑战可能导致剂量估算不准确，因此引入了基于个体有效直径（Deff）和相应大小校正系数的特定尺寸剂量估算（SSDE）以实现更好的个体化剂量估算。本研究旨在针对特定体型估算儿科剂量。本回顾性研究纳入了 0-12 岁的儿科人群。SSDE 源自扫描仪报告的体积 CT 剂量指数（CTDIvol），基于个体有效直径（Deff）和相应的大小校正系数。还研究了 Deff 与年龄、曝光设置、CTDIvol 和 SSDE 等其他相关因素的相关性。马来西亚儿科患者的平均 Deff 小于参考体模大小（置信区间 [CI] = 0.28，平均值 = 14.79），头部（CI = 0.51，平均值 = 16.33）和腹部分别。这导致 SSDE 高于显示的 CTDIvol，从而低估了儿科剂量。头部和腹部 CT 的百分比差异具有统计学意义（p <.001），范围分别为 0 至 17%和 37 至 60%。总之，儿科 CT 成像中 SSDE 的临床实施对于降低辐射风险非常重要。
