Abstract：Objective To compare the difference of volume CT dose index (CTDIvol) and size-specific dose estimate (SSDE) based
on water equivalent diameter (WED) (that is SSDEWED) in measuring radiation dose in abdomen and pelvis of children, and to
explore the feasibility of calculating CTDIvol and SSDEWED based on age. Methods The CT imaging data of 812 children who
underwent abdomen and pelvis examinations from January to December of the 2021 were retrospectively collected. The age, CTDIvol
were recorded; Area of Interest (AROI) and CT Value of ROI (CTROI) were measured, and SSDEWED were calculated to compare the
differences in measured radiation dose between CTDIvol and SSDEWED. The correlation between CTDIvol, SSDEWED and age was
analyzed, and the regression equations were generated, and then analyzed the consistency of the regression equations. Results The
CTDIvol was (2.90±1.20) mGy and the SSDEWED was (5.64±1.90) mGy in 812 cases, and the difference was statistically significant
(P﹤0.001). CTDIvol and SSDEWED increased with the increase of age, and the exponential function fitted well the correlation between
CTDIvol, SSDEWED and age. The measured CTDIvol was (2.90±1.20) mGy, the calculated CTDIvol was (2.91±1.05) mGy, and there
was no statistically significant difference (t=0.97, P=0.33); The measured SSDEWED was (5.64±1.90) mGy, the calculated SSDEWED
was (5.58±1.35) mGy, and the difference was also no statistically significant (t=1.83, P=0.07). The age-based CTDIvol and SSDEWED
had a strong correlations with the measured value (The correlation coefficients were 0.88 and 0.81, respectively).
Conclusion Compared to CTDIvol, SSDEWED is more accurate in measuring the radiation dose in the abdomen and pelvis regions of
children. Using age to predict the radiation dose index of a child can quickly estimate their radiation before examination, which plays
an important role in better control of radiation dose.
基金资助:江苏省政府留学基金（J S - 2 0 1 8 - 1 3 7）；江苏省
妇幼保健课题（F Y X 2 0 1 8 1 6）；南京市医学科技发展基金
（QRX17169）
通讯作者:
张晓军
E-mail: xjzhang@njmu.edu.cn
引用本文:
张见，张晓军. 儿童腹盆部CT辐射剂量指标的比较及回归
方程的建立与分析[J]. 中国医疗设备, 2024, 39(1): 133-137.
ZHANG Jian, ZHANG Xiaojun. Comparison of CT Radiation Dose Index in Abdomen and Pelvis of Children and
Establishment and Analysis of Regression Equations. China Medical Devices, 2024, 39(1): 133-137.
