Fig. 1: Qualitative differences between FFDM and 2DS images.

Examples of the differences in image characteristics for FFDM in (a, c, e, g) and 2DS in (b, d, f, h) for image pairs from four participants. Columns show examples for the different BI-RADS density classes from A, almost entirely fatty in (a, b); B, scattered areas of fibroglandular density in (c, d); C, heterogeneously dense in (e, f); and the highest level D, extremely dense in (g, h). FFDM full-field digital mammography, 2DS two-dimensional synthetic.