Quality control and correct exposure for a whole-breast digital mammography system

Candace D. Lewis; Carolyn Kimme-Smith; Manuel Beifuss; Limin Yang; Lawrence W. Bassett M.D.

doi:10.1117/12.317065

24 July 1998 Quality control and correct exposure for a whole-breast digital mammography system

Candace D. Lewis, Carolyn Kimme-Smith, Manuel Beifuss, Limin Yang, Lawrence W. Bassett M.D.

Proceedings Volume 3336, Medical Imaging 1998: Physics of Medical Imaging; (1998) https://doi.org/10.1117/12.317065
Event: Medical Imaging '98, 1998, San Diego, CA, United States

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.

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Candace D. Lewis, Carolyn Kimme-Smith, Manuel Beifuss, Limin Yang, and Lawrence W. Bassett M.D. "Quality control and correct exposure for a whole-breast digital mammography system", Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); https://doi.org/10.1117/12.317065

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KEYWORDS

Charge-coupled devices

Image quality

Digital mammography

Signal to noise ratio

Receptors

Mammography

Breast

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