山东省CT检查防护水平及其影响因素

Protection Level from CT Examination and Influential Factors in Shandong Province

目的为了解山东省CT机房外辐射水平、CT检查防护措施及影响因素,并对存在的问题提出改进意见,促进CT检查的合理化应用。方法按照GBZ 165-2012《X射线计算机断层摄影放射防护要求》和GBZ 130-2013《医用X射线诊断放射防护要求》的标准要求,进行布点和评价,对山东省辖区内部分CT机房外辐射水平进行检测和防护措施查验。结果总体上,第二轮次检测相比于第一轮次检测,CT机房外辐射水平明显改善,均值绝对差值为0.95μSv/h,降低了76.6%;其中CT机房观察窗部位辐射水平改善最明显,剂量水平降低了82.3%。另外,两次检测均显示,CT检查机房操作位和机房墙处辐射水平最低。结论山东省CT机房外辐射水平已明显改善,部分均值已达到天然本底辐射水平,但部分位置辐射水平及防护措施配置仍有下降空间。

Objective To understand the radiation level outside CT room,distribution of protection measurements and influential factors in Shandong Province,and put forward the suggestions to the existing problems for promoting its rationalization.Methods According to Radiological protection requirements for X-ray computed tomography（ GBZ 165-2012） and Requirements for radiological protection in medical X-ray diagnosis（ GBZ 130-2013）,the radiation level outside CT room was tested and protection measurements of CT was inspected in Shandong Province.Results In general,compared with the first survey,the mean absolute difference is 0.95 μSv / h,decreased by 76.6 %,particularly,decreased by 82.3 % for Pb window in CT room;in addition,the two surveys show that the lowest radiation level outside of CT examination room are from operating position of staff and wall.Conclusion The radiation level outside CT room is significantly improved in Shandong Province,especially,and mean dose value from the partial position of CT room has reached the level of natural background radiation in the second survey.Meanwhile,there is still some space to decline for mean dose from the other partial position of CT room and allocation of protection measurements.