Fig. 2From: Mammographic density assessed on paired raw and processed digital images and on paired screen-film and digital images across three mammography systemsScatter plot of paired √DA readings measured on processed (y axis) vs raw (x axis) digital images, by reader and system. Dashed lines, equality (if DA from processed images was read identically to raw images); blue dots, modelled linear conversion. Reader-specific and system-specific calibration equations for the conversion of raw √DA to processed √DA are supplied in (Additional file 7: Information 2). √DA square root of dense area, GE General ElectricBack to article page