Hwang Jisun, Yoon Hee Mang, Hwang Jae-Yeon, Choi Young Hun, Lee Yun Young, Lee So Mi, Ryu Young Jin, You Sun Kyoung, Park Ji Eun, Lee Seok Kee
Department of Radiology, Ajou University Hospital, Ajou University School of Medicine, Suwon, Republic of Korea.
Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea.
Korean J Radiol. 2025 Jan;26(1):65-74. doi: 10.3348/kjr.2024.0689.
To establish local diagnostic reference levels (DRLs) for pediatric neck CT based on age, weight, and water-equivalent diameter (WED) across multiple university hospitals in South Korea.
This retrospective study analyzed pediatric neck CT examinations from nine university hospitals, involving patients aged 0-18 years. Data were categorized by age, weight, and WED, and radiation dose metrics, including volume CT dose index (CTDI) and dose length product, were recorded. Data retrieval and analysis were conducted using a commercially available dose-management system (Radimetrics, Bayer Healthcare). Local DRLs were established following the International Commission on Radiological Protection guidelines, using the 75th percentile as the reference value.
A total of 1159 CT examinations were analyzed, including 169 scans from Institution 1, 132 from Institution 2, 126 from Institution 3, 129 from Institution 4, 128 from Institution 5, 105 from Institution 6, 162 from Institution 7, 127 from Institution 8, and 81 from Institution 9. Radiation dose metrics increased with age, weight, and WED, showing significant variability both within and across institutions. For patients weighing less than 10 kg, the DRL for CTDI was 5.2 mGy. In the 10-19 kg group, the DRL was 5.8 mGy; in the 20-39 kg group, 7.6 mGy; in the 40-59 kg group, 11.0 mGy; and for patients weighing 60 kg or more, 16.2 mGy. DRLs for CTDI by age groups were as follows: 5.3 mGy for infants under 1 year, 5.7 mGy for children aged 1-4 years, 7.6 mGy for ages 5-9 years, 11.2 mGy for ages 10-14 years, and 15.6 mGy for patients 15 years or older.
Local DRLs for pediatric neck CT were established based on age, weight, and WED across nine university hospitals in South Korea.
基于年龄、体重和水等效直径（WED），为韩国多家大学医院的儿科颈部CT建立本地诊断参考水平（DRL）。
这项回顾性研究分析了9家大学医院的儿科颈部CT检查，涉及0至18岁的患者。数据按年龄、体重和WED分类，并记录辐射剂量指标，包括容积CT剂量指数（CTDI）和剂量长度乘积。使用商用剂量管理系统（Radimetrics，拜耳医疗保健公司）进行数据检索和分析。根据国际放射防护委员会的指南，以第75百分位数作为参考值建立本地DRL。
共分析了1159例CT检查，其中机构1有169例扫描，机构2有132例，机构3有126例，机构4有129例，机构5有128例，机构6有105例，机构7有162例，机构8有127例，机构9有81例。辐射剂量指标随年龄、体重和WED增加，在机构内部和机构之间均表现出显著差异。对于体重小于10 kg的患者，CTDI的DRL为5.2 mGy。在10 - 19 kg组中，DRL为5.8 mGy；在20 - 39 kg组中，为7.6 mGy；在40 - 59 kg组中，为11.0 mGy；对于体重60 kg或以上的患者，为16.2 mGy。按年龄组划分的CTDI的DRL如下：1岁以下婴儿为5.3 mGy，1 - 4岁儿童为5.7 mGy，5 - 9岁为7.6 mGy，10 - 14岁为11.2 mGy，15岁及以上患者为15.6 mGy。
基于年龄、体重和WED，为韩国9家大学医院的儿科颈部CT建立了本地DRL。
