Abstract：Objective To explore the feasibility and value of using Radimetrics software to statistically analyze the radiation dose of large-sample CT scans, in order to realize the comprehensive management of radiation dose in radiology department.
Methods This study retrospectively analyzed radiation dose data from 173731 CT examinations performed on 123753 adults over a
two-year period from July 2019 to July 2021. The statistics were classified by scanning protocol. The median value and interquartile
range of volumetric CT dose index (CTDIvol), size-specific dose estimate (SSDE), dose-length product (DLP) and effective dose
(ED) were calculated according to the scanning region and compared whether the average radiation dose was different on CT
equipment with different detector rows. Results The diagnostic reference levels (DRLs) of CTDIvol of each examined regions were
as follows: 50.1 mGy (head plain scan), and 52.8 mGy (head enhancement)丨 15.7 mGy (neck plain scan), and 16.5 mGy (neck
enhancement)丨 8.1 mGy (chest plain scan), and 9.4 mGy (chest enhancement)丨 9.7 mGy (abdomen plain scan), and 12.7 mGy
(abdominal enhancement)丨 10.3 mGy (chest & abdomen plain scan), and 12.7 mGy (chest & abdomen enhancement). The DRLs
of SSDE of each examined regions were as follows: 11.5 mGy (chest plain scan), and 14.0 mGy (chest enhancement)丨 13.1 mGy
(abdomen plain scan), and 17.9 mGy (abdominal enhancement)丨 14.3 mGy (chest & abdomen plain scan), and 19.1 mGy (chest &
abdomen enhancement). The DRLs of DLP of each examined regions were as follows: 802 mGy·cm (head plain scan), and
1089 mGy·cm (head enhancement)丨 553 mGy·cm (neck plain scan), and 906 mGy·cm (neck enhancement)丨 298 mGy·cm (chest plain
scan), and 683 mGy·cm (chest enhancement)丨 437 mGy·cm (abdomen plain scan), and 1478 mGy·cm (abdominal enhancement)丨
628 mGy·cm (chest & abdomen plain scan), and 1792 mGy·cm (chest & abdomen enhancement). The DRLs of ED of each examined
regions were as follows: 2.2 mSv (head plain scan), and 3.6 mSv (head enhancement)丨 6.1 mSv (neck plain scan), and 10.2 mSv
(neck enhancement)丨 5.9 mSv (chest plain scan), and 13.5 mSv (chest enhancement)丨 8.1 mSv (abdomen plain scan), and 28.9 mSv
(abdominal enhancement)丨 11.8 mSv (chest & abdomen plain scan), and 32.1 mSv (chest & abdomen enhancement).
Conclusion Using the big data analysis function of Radimetrics platform, the radiation dose level of large sample CT scan can be
monitored in real time. The obtained multi-parameter radiation dose index can provide basis for optimizing CT scanning protocol and
establishing local DRLs.
张金戈，刘科伶，夏春潮，李真林. 利用Radimetrics平台实现放射科CT检查辐射剂量的综合管理[J]. 中国医疗设备, 2021, 36(10): 136-139.
ZHANG Jinge, LIU Keling, XIA Chunchao, LI Zhenlin. Using Radimetrics Platform to Achieve the Comprehensive Management of Radiation Dose of
CT Examination in Radiology Department. China Medical Devices, 2021, 36(10): 136-139.
