利用Barracuda系统测量医用CT剂量指数量值不确定度评定  

Evaluation of uncertainty in measurement of computed tomography dose index by Barracuda system

作　　者：李秀芹[1] 赵进沛[1] 杨会锁[1] 胡平[2] 杨新芳[1] 

机构地区：[1]中国人民解放军北京军区疾病预防控制中心卫生防护科,北京市100042 [2]石家庄市疾病预防控制中心

出　　处：《职业与健康》2012年第8期954-955,共2页Occupation and Health

摘　　要：目的为保证医用CT剂量指数量值的准确性,评定其不确定度。方法建立Barracuda系统10 cm长杆电离室测量CT剂量指数数学模型,分析不确定度来源,通过计算给出不确定度。结果相对扩展不确定度为6.5%。结论利用Bar-racuda系统测量医用CT剂量指数量值不确定度主要受测量系统不确定度、校准因子、层厚偏差等分量的影响。[Objective]In order to ensure the accuracy of computed tomography dose index,to evaluate the measurement uncertainty.[Methods]The mathematical model of Barracuda system with 10 cm long ionization chamber in measurement of computed tomography dose index was established,the uncertainty was calculated by analyzing the uncertainty source.[Results]The relative expanded uncertainty was 6.5%.[Conclusion]The uncertainty of Barracuda system in measurement of computed tomography dose index is mainly influenced by the uncertainty of the measurement system,the calibration factors and the thickness deviation.

关 键 词：Barracuda、医用CT 剂量指数 测量不确定度 

分 类 号：R144[医药卫生—公共卫生与预防医学]