Analysis on consistency between actual measured dose and displayed dose in CT examination on head of children
10.3969/j.issn.1672-8270.2025.06.004
- VernacularTitle:儿童头部CT检查实测剂量与显示剂量的一致性分析
- Author:
Yu ZHANG
1
;
Xiangjie MA
1
;
Zhuo HUANG
1
Author Information
1. 中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室 北京 100088
- Publication Type:Journal Article
- Keywords:
Children;
Head;
Computed tomography(CT)examination;
Radiation dose
- From:
China Medical Equipment
2025;22(6):19-23
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To assess the consistency between displayed doses and actual doses of the computed tomography(CT)equipment of different manufactories and types through compares the actual measured dose and the displayed dose in CT examination on head of children,so as to provide references for rapid estimation and scientific assessment for the dose in CT examination on head of children.Methods:The CT equipment of two kinds of commonly used brands were selected,which included Brand A(imported equipment,16-slice and 64-slice)and Brand B(domestic equipment,16-slice and 32-slice).A pediatric head phantom was used to conduct scan according to pre-set scan protocol for children at different ages.A ionization chamber that like a pen was adopted to measure CT dose index(CTDI)values of scanning the head of children under various scan parameters,which were compared with the displayed values in equipment.Results:For 16-slices CT of Brand A,the ratio range of actually measured dose to displayed dose was between 1.08 and 1.10.For the 64-slices CT of Brand A,that was between 1.11 and 1.17.For the 16-slices CT of Brand B,that was between 1.00 to 1.04.For the 32-slices CT of Brand B,that was between 1.12 to 1.21.All ratios were slightly higher than 1,but were within a relatively concentrated range.Under the products of different tube voltages(kV)and tube current-time(mAs),the volatility of ratio range of actually measured dose to displayed dose of different ages was less than 5%,which indicated the deviations were stable,and the influence of parameters was less.Conclusion:In CT examinations on head of children,the consistency of the ratio value between actually measured value and displayed value is higher under the acquiescent scan conditions of the scan protocol for head of children at different ages,which can conduct rapidly dose estimation as a certain conversion coefficient.
