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| Comparative Research on Two Methods of Measurement Data Processing for Average Glandular Dose |
| ZHAO Cai-xian |
| Guizhou Institute for Metrology & Calibration,Guiyang, Guizhou 550001, China |
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Abstract 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 3Urel≤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.
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Received: 08 April 2020
Published: 10 October 2020
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2020, Vol. 41 
