| Li Mengxue,Jiang Tongxin,Zhao Yu,et al.Survey and analysis of the medical exposure level in Jixi city[J].Chinese Journal of Radiological Medicine and Protection,2026,46(4):389-395 |
| Survey and analysis of the medical exposure level in Jixi city |
| Received:August 01, 2025 |
| DOI：10.3760/cma.j.cn112271-20250801-00276 |
| KeyWords:Medical exposure|Radiodiagnosis and radiotherapy|Frequency|Distribution|Collective effective dose |
| FundProject: |
| Author Name | Affiliation | E-mail | | Li Mengxue | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Jiang Tongxin | Jixi Municipal Center for Disease Control and Prevention (Jixi Municipal Health Supervision Bureau), Jixi 158100, China | | | Zhao Yu | Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China | | | Fan Shengnan | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Zhang Jingguo | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Deng Jun | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | dengjun@nirp.chinacdc.cn | | Sun Quanfu | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | |
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| Abstract:: |
| Objective To understand the frequency level of medical exposure and the distribution of various types of radiodiagnosis and radiotherapy examinations/procedures in Jixi city, and to estimate the population dose burden induced by medical exposure. Methods A census was conducted using designed uniform questionnaires. Data on the medical radiological examinations/procedures (MREPs) of various types of radiodiagnosis and radiotherapy in Jixi city in 2022 were collected from related information systems and manual register books in hospitals. Then, in combination with the total population in the city at the end of 2022, the frequencies of medical exposure were obtained. Further analyses were conducted on the distribution of MREPs across different gender, age groups and examination sites. The collective effective dose induced by medical exposure (excluding radiation doses from radiotherapy and nuclear medicine therapy) was assessed based on frequency-weighted mean effective dose per examination/procedure introduced in UNSCEAR 2020/2021 Report. Results In 2022, a total of 821 250 person-times of MREPs were conducted in Jixi city, with a frequency of 504 person-times per 1 000 population. Among these examinations/procedures, medical X-ray diagnosis was identified as the predominated radiodiagnosis and radiotherapy type, accounting for 98.59%. The medical X-ray diagnosis showed a frequency of 497 person-times per 1 000 population. Notably, computed tomography (CT) scans exhibited a frequency of 289 person-times per 1 000 population. The frequencies of interventional radiology, radiotherapy and nuclear medicine were 5.57, 0.26 and 1.28 person-times per 1 000 population, respectively. The annual collective effective dose caused by medical exposure was 3 290.32 man·Sv, with an annual per caput effective dose of 2.02 mSv. CT scans contributed 91.65% of the annual collective effective dose. In terms of age group, ages ≥ 40 represented the highest proportion in various types of radiodiagnosis and radiotherapy examinations/procedures. Regarding the examination site, the chest emerged as the primary site in both conventional X-ray diagnosis and CT scans, accounting for 49.2% and 45.9%, respectively. Interventional radiology was dominated by cardiovascular intervention (73.2%), while thoracic tumors were identified as the leading category for radiotherapy (47.5%). Conclusions Preliminary insights into the medical exposure level and the distribution of various types of radiodiagnosis and radiotherapy examinations/procedures in Jixi city are obtained in this study. The result indicates that the annual per caput effective dose induced by medical exposure in the city is significantly higher than that of regions with health care level I. CT scans, with rapid growth in frequency, contribute considerably to the collective effective dose. Therefore, it is necessary to reinforce justification assessment of CT scans and attach importance to their population dose burden. |
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