ABSTRACT
Objective To assess the frequency of medical exposure from X-ray diagnostic equipment in Tianjin,and provide recommendations for regulating medical radiation management and rational allocation and use of medical and health resources.Methods Using the census method,questionnaries were issued in the form of an administrative document to investigate the basic information on X-ray diagnostic equipment and medical procedure frequency in 687 hospitals (excluding military and armed police hospitals) in 2018.Mean values of frequencies were derived by dividing the number of procedures for each type of X-ray equipment by the total number of permanent residents.Results There were 1 562 pieces of X-ray diagnostic equipment (including interventional radiology),with an average of 1.00 unit per 10 000 population.There were 4 782 radiation workers engaged with X-ray diagnostic work (including interventional radiology),averaged on 3.06 workers per unit,with the highest of 5.25 workers per unit in tertiary hospitals and the lowest of 1.18 in ungraded hospitals.The city's X-ray diagnostic medical exposure came from 8 905 970 medical procedures,including 54.81％ for tertiary hospitals,18.00％ for secondary hospitals,16.21％ for primary hospital,and 10.98％ for ungraded hospitals.X-ray photography contributed 71.30％ with annual frequency of 407.84 examinations per 1 000 population,CT scans 21.81％ with annual frequency of 124.74 examinations per 1 000 population,interventional radiology 1.04％,with annual frequency of 5.98 examinations per 1 000 population,and other types of X-ray examinations 5.85％ with annual frequency of 33.47 examinations per 1 000 population.Conclusions The configuration of X-ray diagnostic equipment in Tianjin is basically reasonable.The frequency of X-ray diagnostic medical exposure is increasing year by year.The rationality of the distribution of X-ray diagnostic examinations needs to be further improved.To reduce dose to population,for the public health and safety is important issues in the future of radiation protection.
ABSTRACT
Objective@#To investigate the usage frequency of radiological diagnosis devices in ten hospitals in Tianjin, China, and to provide a basis for the survey of medical radiation frequency in Tianjin.@*Methods@#Ten hospitals from the ten districts in Tianjin were enrolled as subjects by a convenient sampling method. A survey was conducted to assess the general information and radiological diagnosis device information and usage frequency in those hospitals in 2016. The radiological examination frequency in Tianjin was estimated.@*Results@#A total of 610 458 patients received radiological examinations in the sampled hospitals in 2016. In those patients, 371 882 received X-ray examinations for imaging and 238 576 for computed tomography (CT) ; there were slightly more female patients than male patients, suggesting a relatively equal gender distribution; patients older than 40 years accounted for 65.53%, which was the highest among all the age groups. Different types of radiological diagnosis devices were mostly used in tertiary and secondary hospitals. In Tianjin, the estimated frequency of X-ray examination for imaging and CT scanning was 451 and 188 per thousand people, respectively, in 2016.@*Conclusion@#The frequency of radiological diagnosis is relatively high in the ten hospitals in Tianjin. The investigation of medical radiation in Tianjin needs to be improved.