This study was conducted to determine first local diagnostic reference levels (DRLs) and achievable doses (ADs) for pediatric patients during the most common computed tomography (CT) procedures in Yazd province. The DRL was obtained based on volume CT dose index (CTDIvol) and dose length product (DLP) for four various age groups of children. Data were collected from the most commonly performed pediatric CT scans, including abdomen–pelvis, chest, brain and sinus examinations, at six high-loaded institutes. The patients’ data (766 no.) in terms of CTDIvol and DLP were obtained from four age groups: ≤1-, 1–5-, 5–10- and 10–15-y-old. The 75th percentiles of CTDIvol and DLP were considered as DRL values and the 50th percentiles were described as ADs for those parameters. Consequently, the acquired DRLs were compared with other national and international published values. The DRLs in terms of CTDIvol for abdomen–pelvis, chest, brain and sinus examinations were 3, 8, 9 and 10 mGy; 4, 5, 5 and 5 mGy; 25, 28, 29 and 38 mGy; and 23, 24, 26 and 27 mGy for four different age groups of ≤1-, 1–5-, 5–10- and 10–15-y-old, respectively. The DRL values in terms of DLP were 75, 302, 321 and 342 mGy.cm; 109, 112, 135 and 170 mGy.cm, 352, 355, 360 and 481 mGy.cm; and 206, 211, 228 and 245 mGy.cm, respectively, for the mentioned age groups. In this study, the DRL and AD values in the brain examination were greater among the other studied regions. The DRL plays a critical role in the optimization of radiation doses delivered to patients and in improving their protection. This study provides the local DRLs and ADs for the most common pediatric CT scanning in Yazd province to create optimum situation for the clinical practice.

中文翻译：

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在普通计算机断层扫描检查中估计儿科患者的诊断参考水平和可达到的剂量：一项多中心研究

本研究旨在确定在亚兹德省最常见的计算机断层扫描 (CT) 程序中儿科患者的首个局部诊断参考水平 (DRL) 和可达到的剂量 (AD)。DRL 是根据四个不同年龄组儿童的体积 CT 剂量指数 (CTDIvol) 和剂量长度乘积 (DLP) 获得的。数据来自六个高负荷机构最常进行的儿科 CT 扫描，包括腹部-骨盆、胸部、脑部和鼻窦检查。患者的 CTDIvol 和 DLP 数据（766 人）来自四个年龄组：≤1 岁、1-5 岁、5-10 岁和 10-15 岁。CTDIvol 和 DLP 的第 75 个百分位被认为是 DRL 值，第 50 个百分位被描述为这些参数的 AD。所以，将获得的 DRL 与其他国家和国际公布的值进行比较。腹部-骨盆、胸部、脑部和鼻窦检查的 CTDIvol 的 DRL 分别为 3、8、9 和 10 mGy；4、5、5 和 5 毫戈瑞；25、28、29 和 38 毫戈瑞；分别为 ≤1 岁、1-5 岁、5-10 岁和 10-15 岁的四个不同年龄组的 23、24、26 和 27 mGy。DLP 方面的 DRL 值为 75、302、321 和 342 mGy.cm；109、112、135 和 170 mGy.cm、352、355、360 和 481 mGy.cm；对于上述年龄组，分别为 206、211、228 和 245 mGy.cm。在这项研究中，大脑检查中的 DRL 和 AD 值在其他研究区域中更大。DRL 在优化提供给患者的辐射剂量和改善他们的保护方面发挥着关键作用。