上海市4家儿童医院的儿童CT剂量分析

目的通过对上海市儿童CT扫描受检者剂量参数的调查, 探讨上海地区儿童CT扫描剂量分布情况, 并为建立上海地区儿童受检者CT检查诊断参考水平提供依据。方法 2021年在上海地区全部4家儿童医院开展儿童头颅、胸部、腹部CT扫描受检者剂量普查, 调查对象按年龄0～、1～、5～、10～15岁分为4个年龄组, 每个年龄组调查30例, 收集受检者基本信息、CT扫描参数、容积CT剂量指数(CTDIvol)和剂量长度乘积(DLP)等剂量指标, 分析同一部位不同年龄组之间和同一部位同一年龄组不同医院之间CTDIvol、DLP的差异。结果头颅CT扫描时, 0～、1～、5～、10～15岁组儿童CTDIvol和DLP的75%位数分别为25、25、28、43 mGy和402、477、504、752 mGy·cm;胸部CT扫描时, 0～、1～、5～、10～15岁组儿童CTDIvol和DLP的75%位数分别为2.7、2.2、2.8、5.4 mGy和40、48、75、176 mGy·cm;腹部CT扫描时, 0～、1～、5～、10～15岁组儿童CTDIvol和DLP的75%位数分别为4.9、4.4、8.2、12 mGy...

Analysis of CT doses to paediatric patients in four children's hospitals in Shanghai

Objective To study the distribution of CT doses to paediatric patients in Shanghai by investigating the CT dose parameters availiable in Shanghai''s children''s hospticals, and to provide the basis for establishing the diagnostic reference level for the paediatic patients subjected to CT scanning in Shanghai.Methods In 2021, a general survey was carried out of the CT doses to the head, chest and abdomen of the scanned paediatric patients in four children''s hospitals in the municipality. The scanned paediatic patients were divided into four age groups of 0-, 1-, 5- and 10-15 years old, each with 30 subjects. The basic information were collected on the subjects, CT scanning parameters, volume CT dose index (CTDI_vol) and dose length product (DLP). SPSS 16.0 was used to carry out statistical analysis of the differences in CTDI_vol and DLP between different age groups at the same site and between different hospitals for the same age group at the same site.Results The 75^th percentile values of CTDI_vol and DLP for 0-, 1-, 5- and 10-15 age groups were 25, 25, 28, 43 mGy and 402, 477, 504, 752 mGy·cm, respectively, for head scanning; 2.7, 2.2, 2.8, 5.4 mGy and 40, 48, 75 and 176 mGy·cm for chest; and 4.9, 4.4, 8.2, 12 mGy and 106, 131, 273, 471 mGy·cm for abdomen. There were significant differences in CTDI_vol and DLP between different age groups at the same site and between different hospitals for the same age group at the same site (head, chest and abdomen CTDI_vol:χ²=221.68, 167.27, 127.07, DLP:χ²=220.63, 261.46, 216.61; for four age groups, CTDI_vol:head χ²=30.46, 38.39, 25.21, 73.04, chest χ²=30.46, 35.69, 58.92, and 48.03, abdomen χ²=66.58, 41.62, 48.93, and 67.38; DLP:head χ²=28.82, 72.49, 47.72, 52.34, chest χ²=28.82, 35.95, 50.66, 41.64, abdomen χ²=45.53, 26.02 39.34, 44.24, P <0.05).Conclusions The 75^th percentile values of CTDI_vol and DLP for head, chest and abdomen in 4 children''s hospitals in Shanghai are lower or close to the values given in the relevant national standards and the diagnostic reference levels in some European countries, with higher DLP values on some scanning sites. The CT scanning procedures for paediatric patients needs to be further optimized.