乳腺腺体平均剂量2种测量数据处理方法的比较研究

Comparative Research on Two Methods of Measurement Data Processing for Average Glandular Dose

针对医用乳腺X射线辐射源AGD测量数据处理过程中存在的难点问题,进行了试验研究,提出了2种有效的数据处理方法:近值法和线性拟合法。经过试验和比较得到以下结论:2种数据处理方法获得的测量结果及不确定度均符合相关技术规范要求,满足3 U rel≤MPE的符合性判定准则。比较而言,线性拟合法获得的测量结果更加准确,其相对扩展不确定度(k=2)在5.7%~6.5%范围内,而近值法获得的相对扩展不确定度在6.4%~10%范围内。两种数据处理方法有效解决了医用乳腺X射线辐射源检定中不同模体厚度的转化因子和不同乳房成分修正因子如何确定的问题,为国家规程的下一步修订完善提供了参考,对其它同类测量数据的分析和处理也具有一定的借鉴作用。

Focusing on the difficulties that exist in the data processing of the AGD measurement of medical X-ray radiation source for mammographic equipment,two effective data processing methods were proposed:the nearest value method and the linear fitting method.Through test and comparison,the following conclusions were obtained:the measurement results and uncertainty obtained by the two data processing methods meet the requirements of relevant technical specifications,and satisfied the judge standard of 3 U rel≤MPE.In comparison,the measurement results obtained by linear fitting method are more accurate,its relative expanded uncertainty(k=2)is in the range of 5.7%~6.5%,while that obtained by the nearest value method is in the range of 6.4%~10%.The above two data processing methods can effectively solve the problem of how to determine the conversion factor of different phantom thickness and the correction factor of different breast components in the verification of medical breast X-ray radiation source,and provide some reference for the next revision and improvement of national regulations,and also have a certain reference for the analysis and processing of other similar measurement data.