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Radiation Dose Reduction for Augmentation Mammography

Ralph L. Smathers1, John M. Boone2, Lisa J. Lee1, Eric A. Berns3, Robert A. Miller4 and Allan M. Wright5

1 Mammography Specialists Medical Group, Inc., 14651 S Bascom Ave., Suite 210, Los Gatos, CA 95032.
2 Departments of Radiology and Biomedical Engineering, University of California Davis Medical Center, Sacramento, CA.
3 Lynn Sage Breast Center, Northwestern University Feinberg School of Medicine, Chicago, IL.
4 Queen of the Valley Hospital, Napa, CA.
5 Radiological Associates Medical Group of Santa Clara Valley, San Jose, CA.


Figure 1
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  		Fig. 1A —45-year-old woman with breast implants who underwent screening mammography. Bilateral craniocaudal implant-full view.

 

Figure 2
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  		Fig. 1B —45-year-old woman with breast implants who underwent screening mammography. Bilateral mediolateral oblique implant-full view.

 

Figure 3
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  		Fig. 1C —45-year-old woman with breast implants who underwent screening mammography. Bilateral craniocaudal implant-displaced view.

 

Figure 4
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  		Fig. 1D —45-year-old woman with breast implants who underwent screening mammography. Bilateral lateromedial implant-displaced view.

 

Figure 5
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  		Fig. 2 —Graph of exponentially fitted curves shows relation for individual views of compressed breast thickness and mean glandular dose for four-view augmentation mammography in six groups. ID = implant-displaced view, IF = implant-full view, 100 = 100-speed film, 190 = 190-speed film, MoMo = molybdenum-molybdenum target-filter combination, MoRh = molybdenum-rhodium target-filter combination, RhRh = rhodium-rhodium target-filter combination. Mean glandular dose increases exponentially as breast thickness increases, especially for implant-displaced views. Molybdenum-molybdenum target-filter combinations have highest doses, and rhodium-rhodium have lowest. Mean glandular dose is 35% lower for 190-than for 100-speed film.

 

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