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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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