医疗卫生装备2024，Vol.45Issue(7)：46-50,5.DOI:10.19745/j.1003-8868.2024130
儿童头颅CT检查不同辐射剂量衡量指标差异性比较及相关性分析
Comparison and correlation analysis of different radiation dose indicators in children's head CT examination
摘要
Abstract
Objective To compare the differences between volume CT dose index(CTDIVOL)and size-specific dose estimate based on water equivalent diameter(SSDEWED)in measuring head CT radiation in children and analyze the correlations between CTDIVOL and SSDEWED based on water equivalent diameter with exposure dose and water equivalent diameter(WED),so as to provide references for the measurement of head CT radiation of children.Methods Totally 1 297 child patients undergoing cranial CT examination in some hospital from January to December 2021 were analyzed retrospectively,and were divided into four groups whose ages were not higher than one month,higher than one month to four years,higher than 4 years to 10 years and higher than 10 years to 15 years,respectively.The exposure dose,age,CTDIVOL and dose length product of the children were recorded,and the WED,conversion factor and SSDEWED were calculated.The differences between CTDIVOL and SSDEWED were compared;the regression models of CTDIVOL and SSDEWED with exposure dose and WED were established,and the correlations between them were explored with Pearson analysis;the differences were analyzed between the diagnostic reference level(DRL)in China,EU DRL and local DRL(LDRL).SPSS 25.0 was used for statistical analysis.Results The CTDIVOL of the children's cranial CT was(9.22±1.63)mGy,and SSDEWED was(8.14±0.84)mGy,and CTDIvoL was 13.27％higher than SSDEWED,with a statistically significant difference(t=47.66,P＜0.001).CTDIVOL and SSDEWED were both positively correlated with exposure dose and WED(P＜0.001);the CTDIVOL and SSDEWED regression models with exposure dose and WED fitted well with R2 being 0.58 to 0.99.LDRLs were at a lower level when compared with DRLs in EU and China.Conclusion SSDEWED behaves better than CTDIVOL when used for measuring head CT radiation in children.Regular statistical updating of DRL values in medical institutions and optimization of examination parameters are important ways to reduce radiation doses.[Chinese Medical Equipment Journal,2024,45(7):46-50]关键词
儿童头颅CT/CTDIVOL/SSDEWED/LDRL/DRL/辐射剂量Key words
children cranial CT/volume CT dose index/size-specific dose estimate based on water equivalent diameter/local diagnostic reference level/diagnostic reference level/radiation dose分类
医药卫生引用本文复制引用
张见,杨凤,张晓军..儿童头颅CT检查不同辐射剂量衡量指标差异性比较及相关性分析[J].医疗卫生装备,2024,45(7):46-50,5.基金项目
江苏省政府留学基金项目(JS-2018-137) （JS-2018-137）
