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Adverse Effects of Increased Body Weight on Quantitative Measures of Mammographic Image Quality

¹ All authors: Department of Radiology, University of Michigan Health System, 1500 E. Medical Center Dr., Ann Arbor, MI 48109-0326.

View larger version (76K): [in a new window]   Fig. 1A. —Craniocaudal mammograms of an overweight woman. Routine craniocaudal image compressed to 6.0 cm (27 kVp, 172 mAs, molybdenum target) (A) and anterior compression craniocaudal image resulting in decreased thickness to 4.6 cm (25 kVp, 165 mAs, molybdenum target) (B). Spiculated mass (shown to be invasive ductal carcinoma) is better visualized on thinner compressed image (B), partly because of improved geometric sharpness and improved contrast.

View larger version (92K): [in a new window]   Fig. 1B. —Craniocaudal mammograms of an overweight woman. Routine craniocaudal image compressed to 6.0 cm (27 kVp, 172 mAs, molybdenum target) (A) and anterior compression craniocaudal image resulting in decreased thickness to 4.6 cm (25 kVp, 165 mAs, molybdenum target) (B). Spiculated mass (shown to be invasive ductal carcinoma) is better visualized on thinner compressed image (B), partly because of improved geometric sharpness and improved contrast.

View larger version (77K): [in a new window]   Fig. 2A. —American College of Radiology breast phantom shows area of speck groups 1 and 2. Routine image of phantom at 4.4 cm thickness (26 kVp, 126 mAs, molybdenum target) (A) and after increasing thickness to 7.4 cm (30 kVp, 144 mAs, rhodium target) (B). Specks are better seen in thinner phantom (A) because of improved geometric sharpness and improved contrast.

View larger version (87K): [in a new window]   Fig. 2B. —American College of Radiology breast phantom shows area of speck groups 1 and 2. Routine image of phantom at 4.4 cm thickness (26 kVp, 126 mAs, molybdenum target) (A) and after increasing thickness to 7.4 cm (30 kVp, 144 mAs, rhodium target) (B). Specks are better seen in thinner phantom (A) because of improved geometric sharpness and improved contrast.

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