中文摘要：

目的掌握上海市＂十五＂和＂十一五＂期间X射线CT医疗照射水平现状和应用频率的发展趋势。方法采用面上普查的方式,调查上海市医用X射线CT机应用情况,并分头部、体部调查上海市各医院CT检查年人次数,并结合上海市历年人口资料计算X射线CT医疗照射应用频率。结果截至2007年底上海市共有医用X射线CT应用单位101家,在用医用X射线CT机151台。上海市＂十五＂和＂十一五＂期间X射线CT医疗照射应用频率逐年递增,2007年CT检查年频率为128.16人次/千人口,其中头部检查年频率66.94人次/千人口,体部检查年频率61.22人次/千人口,CT检查年频率占各类X射线诊断检查年频率总数的12.8%。结论上海市＂十五＂和＂十一五＂期间X射线CT应用单位数和设备数及医疗照射应用频率较＂九五＂期间有较大增幅,CT检查年频率占各类X射线诊断检查的比例大幅增加。频率水平的增长是导致公众集体剂量负担增加的主要原因。

英文摘要：

Objective To grasp the present status and the development trend on the application frequency of medical exposure from X-ray computed tomography during the tenth and the eleventh five-year plan in Shanghai.Methods The general status on medical application of X-ray CT scanners in Shanghai was investigated,and the annual numbers of head and body examinations in all hospitals were separately surveyed.The application frequency of medical exposure from X-ray CT was calculated based on the annual resident population released by Shanghai Statistics Bureau.Results A total of 151 sets of medical X-ray CT scanners were used in 101 hospitals of Shanghai in 2007.The application frequency of medical X-ray CT examinations kept increasing during the periods of the tenth and the eleventh five-year plan in Shanghai.The total frequency of X-CT examinations was 128.16‰ in 2007,with 66.94 and 61.22 examinations for head CT and body CT examinations,respectively.The annual frequency of X-CT examination accounts 12.8% of the total diagnostic X-ray procedures.Conclusion Compared with the data surveyed during the period of the ninth five-year plan,both the number of hospital possessing X-ray CT scanners and their application frequencies obviously increased during the period of the tenth and the eleventh five-year plan in Shanghai The examination ratio of X-ray CT application to the total diagnostic X-ray procedures significantly raised.And it is the main reason for the increased collective dose of the public.