Investigation of entrance surface doses from extra-oral dental X-ray devices in Nanping City, China
10.13491/j.issn.1004-714X.2025.05.020
- VernacularTitle:南平市口外牙科X射线机入射体表剂量调查
- Author:
Jiahua TAN
1
;
Haiyan CHU
2
;
Yuanhao ZHANG
3
;
Chaohui LI
3
Author Information
1. School of Public Health, Key Laboratory of Public Health Safety and Emergency Prevention and Control Technology of Higher Education Institutions in Jiangsu Province, Nanjing Medical University, Nanjing 211166, China;Nanping Center for Disease Control and Prevention, Nanping 353000, China.
2. School of Public Health, Key Laboratory of Public Health Safety and Emergency Prevention and Control Technology of Higher Education Institutions in Jiangsu Province, Nanjing Medical University, Nanjing 211166, China.
3. Nanping Center for Disease Control and Prevention, Nanping 353000, China.
- Publication Type:OriginalArticles
- Keywords:
Entrance surface dose;
Cone beam computed tomography;
Conventional oral panoramic tomography;
Medical exposure guidance level
- From:
Chinese Journal of Radiological Health
2025;34(5):751-757
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the entrance surface dose (ESD) of dental radiological diagnosis and treatment devices in Nanping City of Fujian Province, China, assess the radiation risk differences between cone beam computed tomography (CBCT) and conventional oral panoramic tomography (COPT), and compare the output dose levels between domestic and imported devices and between public and private medical institutions, and to provide evidence for optimizing radiation protection strategies. Methods A cross-sectional survey was conducted on 38 extraoral dental X-ray devices from 38 dental institutions in Nanping City. Measurements of ESD for different exposure types (adult/child COPT and CBCT) were performed using an adult head-and-neck phantom and thermoluminescent dosimeters. A statistical analysis (Mann-Whitney U test) was applied to compare dose differences by device type and institution type. Results The median tooth-region doses for adult/child CBCT (8.97/6.80 mGy) were significantly higher than those of adult/child COPT (0.33/0.24 mGy), with the 75th percentile values (12.44/8.18 mGy) exceeding the national guideline level of 7 mGy. Domestically manufactured devices demonstrated higher median doses and greater dose variability compared to imported devices (P < 0.05). Private institutions exhibited inferior dose control stability relative to public institutions (P < 0.001). CBCT delivered substantially higher radiation exposure to the thyroid and ocular lenses, with child lens dose reaching 5.9 times that of COPT. Conclusion Dental CBCT radiation doses in Nanping City exceed the guideline level. Enhanced protection for sensitive organs, restriction of unnecessary pediatric examinations, technological upgrades for domestic devices, and strengthened regulation and operational standardization of private institutions are critical to achieve precise radiation protection and improved medical quality.
