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Relationship between phantom failure rates and radiation dose in mammography accreditation
Author(s) -
Haus Arthur G.,
Yaffe Martin J.,
Feig Stephen A.,
Hendrick R. Edward,
Butler Priscilla A.,
Wilcox Pamela A.,
Bansal Swati
Publication year - 2001
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1408283
Subject(s) - imaging phantom , mammography , dosimeter , medicine , nuclear medicine , image quality , dosimetry , automatic exposure control , quality assurance , thermoluminescent dosimeter , medical physics , computer science , breast cancer , artificial intelligence , external quality assessment , pathology , cancer , image (mathematics)
The American College of Radiology Mammography Accreditation Program (ACR MAP) reviews both clinical mammograms and a phantom image to assess clinical and technical quality from each mammography unit. The phantom contains details representing fibers (speculations), speck groups (microcalcifications), and masses. The depiction of these structures by the mammographic system is scored by medical physicists. The phantom image is taken using the facility's exposure technique for a 4.2‐cm thick breast of average composition. The mean glandular dose (MGD) is determined from a set of thermoluminescent dosimeters placed on top of the chest wall edge of the phantom. Phantom scores and MGD data collected from 1993 to 1999 based on 31 535 unit evaluations are presented in this paper. The relationship between the failure rate for phantom image quality and MGD has been analyzed. While over all doses the phantom failure rate was 11%, for doses of 0.26 to 0.50 mGy the failure rate was 43%. The phantom failure rate fell continuously to about 6% for MGDs in the range of 1.51–2.0 mGy. With further increases in dose, failure rates began to rise. Factors that may account for these results are presented and discussed.

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