中国医学装备2025，Vol.22Issue(2)：26-30,5.DOI:10.3969/j.issn.1672-8270.2025.02.005
基于体型特异性剂量估算值与管电流时间乘积预估儿童头颅CT诊断参考水平的研究
Research on estimating the diagnostic reference levels of pediatric head CT based on size-specific dose estimation and tube current time production
摘要
Abstract
Objective:To explore the diagnostic reference level(DRL)of computed tomography(CT)based on size-specific dose estimate(SSDE)for child's head,and estimate the SSDE by using tube current time production.Methods:The CT data of head of 1259 pediatric patients who underwent CT examination in Children's Hospital of Nanjing Medical University from January 2023 to December 2023 were retrospectively collected.They were divided into six groups according to different ages:<6 months group,6 months to<1 year group,1 to<3 years group,3 to<6 years group,6 to<12 years group,and≥12 years group.Additionally,they were divided into five groups based on body size:<12.5 cm group,12.5 to<14 cm group,14 to<15 cm group,15 to<16 cm group,and≥16 cm group.The volume CT dose index(CTDIVOL),tube current time production(mAs),left and right diameter(LRD),area(AROI)and CT value(CTROI)of region of interest of different age groups were respectively measured and recorded.The water equivalent diameter(DW),conversion factor(f H16)and SSDE based on DW(SSDEDW)were calculated.The DRLs distribution based on age and body size was analyzed by statistic method,and the correlation between DW and mAs was analyzed by regression analysis,and a regression model between SSDEDW and mAs was further established.The intra-group correlation coefficient(ICC)was used to analyze the consistency.Results:In DRLs of various age groups,the CTDIVOL range and SSDEDW range were respectively(12.32 mGy-21.66 mGy)and(13.47 mGy to 17.83 mGy).In the DRL of various body size groups,the CTDIVOL range and SSDEDW range were(13.52 mGy-21.86 mGy)and(13.91 mGy-17.92 mGy).In different ages group of pediatric patients,the range of deviation rates of local DRL(LDRLs)value of radiation dose on head of CTDIVOL value to SSDEDW was-8.54%-21.48%.There were strong positive correlations between DW and mAs at 100 and 120 kVp(r=0.96,0.89,P<0.001),respectively.There was stronger consistency between the calculated value by using SSDEDW and actual measurement value by using sAs(ICC=0.98).Conclusion:SSDEDW can more accurately reflect radiation dose,and SSDEDW can be more quickly calculated to control the radiation dose by using the regression models between SSDEDW and mAs.关键词
儿童头颅CT/管电流与时间乘积/体型特异性剂量值/诊断参考水平(DRL)Key words
Child Head CT/Tube current time production/Size-specific dose estimation(SSDE)/Diagnostic reference level(DRL)分类
医药卫生引用本文复制引用
陆洋,张见,刘杰,张朋,边传振,王颖..基于体型特异性剂量估算值与管电流时间乘积预估儿童头颅CT诊断参考水平的研究[J].中国医学装备,2025,22(2):26-30,5.基金项目
江苏省妇幼保健课题(FYX201918) Project of Jiangsu Maternity and Child Health Care Foundation(FYX201918) （FYX201918）
