作者：高铁, 李国琛

作者单位：温州市计量技术研究院, 浙江温州 325001

关键词：医用诊断计算机断层摄影装置(CT)X射线辐射源; 剂量指数; 测量不确定度

摘要：

为了使医用诊断计算机断层摄影装置(CT)X射线辐射源在模体中的剂量指数测量结果的不确定度评定合理,基于用带有100mm长杆电离室的积分剂量仪测量CT剂量指数的数学模型,对其测量不确定度来源进行分析,列出了方差、灵敏系数及标准不确定度的计算公式,从而给出了CT剂量指数测量的合成标准不确定度和扩展不确定度。

Uncertainty analyses of computed tomography dose index

GAO Tie, LI Guo-chen

Wenzhou Institute of Measurement Technology, Wenzhou 325001, China

Abstract: In order to make the uncertainty of the dose index measurement in the head phantom reasonable for the medical diagnostic X-ray radiation sources of the computed tomography (CT), the measurement uncertainty components were analyzed according to the mathematical model for the computed tomography dose index test method with a 100 mm ionization chamber. And the calculated formula for square-error, sensitivity coefficient and standard deviation were listed in the article. As the results, the standard measurement uncertainty and its expanded uncertainty of CT dose index were presented.

Keywords: Medical diagnostic X-ray radiation source for computed tomography; Dose index; Uncertainty

2008, 34(6): 21-23,43  收稿日期: 2008-3-19;收到修改稿日期: 2008-6-4

基金项目: 

作者简介: 高铁(1980-),男,助理工程师,主要从事理化方面校验工作。

参考文献

[1] 全国计量标准、计量检定人员考核委员会.测量不确定度评定与表示实例[M].北京:中国计量出版社,2001.
[2] JJF 1059-1999,测量不确定度评定与表示[M].北京:中国计量出版社,1999.
[3] JJG 961-2001,医用诊断计算机断层摄影装置(CT)X射线辐射源[M].北京:中国计量出版社,2001.
[4] RTI electrouics AB. Solidose 300/308/400 digital dosemeters user's manual[M]. Sweden:RTI electrouics AB,1997.