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European Radiology Experimental
Fig. 4 | European Radiology Experimental

Fig. 4

From: Digital subtraction of temporally sequential mammograms for improved detection and classification of microcalcifications

Fig. 4

Example of temporal subtraction in a woman (BI-RADS breast density class b) with BI-RADS benign and suspicious microcalcifications. a Most recent mammographic view. b Prior mammographic view. c The result of subtracting the registered version of b from a, where the contrast ratio has increased 92 times after subtraction. d−f Zoomed regions marked by the red squares in a−c. g–i Zoomed regions marked by the red squares in d−f where the arrowheads point to new BI-RADS suspicious microcalcifications, which were not subtracted. (j−l) Zoomed regions marked by the green squares in d−f where the arrow points to pre-existing BI-RADS benign microcalcifications, which were completely subtracted. CR Contrast ratio

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