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Proceedings Paper

Quality control and correct exposure for a whole-breast digital mammography system
Author(s): Candace D. Lewis; Carolyn Kimme-Smith; Manuel Beifuss; Limin Yang; Lawrence W. Bassett
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Paper Abstract

Quality control practices in screen/film mammography are inadequate and not necessarily suitable for digital mammography due to differences in spatial resolution, contrast, and artifacts. And screen/film exposure techniques are not useful in determining the correct digital techniques. This study has produced changes and additions to mammography quality control appropriate for digital systems, and has revealed necessary changes in exposure to optimize digital image quality. Quality control has been studied for the TREX whole breast digital system with a phantom designed to test each CCD individually for SNR and calcification conspicuity. In addition, white fields were compared at different time intervals to determine the necessary frequency of recalibration. Optimal exposure techniques were determined by varying kVp, mAs, and filter in order to maximize SNR and calcification conspicuity while minimizing mean glandular dose. Variations in the white field were found to necessitate weekly recalibrations. Increasing the kVp or mAs or both was found to improve SNR and calcification conspicuity, and if rhodium filtration instead of molybdenum was used, mean glandular dose was lowered to mandated levels with no loss in SNR.

Paper Details

Date Published: 24 July 1998
PDF: 8 pages
Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); doi: 10.1117/12.317065
Show Author Affiliations
Candace D. Lewis, UCLA School of Medicine (United States)
Carolyn Kimme-Smith, UCLA School of Medicine (United States)
Manuel Beifuss, UCLA School of Medicine (United States)
Limin Yang, UCLA School of Medicine (United States)
Lawrence W. Bassett, UCLA School of Medicine (United States)


Published in SPIE Proceedings Vol. 3336:
Medical Imaging 1998: Physics of Medical Imaging
James T. Dobbins; John M. Boone, Editor(s)

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