江苏省2016年度医疗照射频度调查

目的 本研究旨在探讨我省医疗照射频度发展状况，寻找医疗照射频度调查有效方法。方法 随机抽取31家医疗机构开展医疗照射频度调查，调查2016年相关放射诊疗活动，采用门急诊量、工作人员数和住院人数3因素回归拟合，建立线性预测模型并根据全省3因素总量估算2016年江苏省医疗照射总频度。结果 2016年江苏省医疗照射总频度为926.62 人次/千人口，其中X射线诊断911.70 人次/千人口，放射治疗1.85 人次/千人口，核医学应用（诊断和治疗）7.97人次/千人口。CT检查、放射治疗和核医学的五年平均增长率依次为158%、58.7%和107%。结论 多因素回归估算医疗照射频度好于单因素估算，本次调查结果受样本量和代表性限制，有待进一步调查研究核实。CT检查和核医学诊断发展速度占前两位，应加强医疗照射防护，实现医疗照射利益最大化。

Survey and analysis on application frequency of medical exposure in Jiangsu Province in 2016

Objective To investigate the increasing frequency of medical exposure in Jiangsu Province and to develop an efficient method for the investigation. Methods Thirty-one medical facilities were randomly chosen to study the application frequency of medical exposure in the year of 2016. A multivariate linear regression model was built based on three independent variables (number of staff, numbers of outpatient and inpatient) to predict the frequency of medical exposure in Jiangsu Province. Results The frequency of medical exposure in Jiangsu Province was 926.62 person·times per thousand population including 911.70 person·times of X-ray diagnostic radiology, 1.85 person·times of radiotherapy and 7.97 person·times of nuclear medicine application per thousand population, respectively. The 5-year increasing rates of, CT scan, radiotherapy and nuclear medicine wer 158%, 58.7% and 107%. Conclusion Multivariate regression method performs better than univariate regression. Further investigations need to be done due to the limitation of sample. The frequencies of CT scan and nuclear medicine increased fast, medical radiation protection should be strengthened to maximize the benefits of medical exposure.