Fig. 2

Bland–Altman analysis of (a) breast and (b) dense area (cm²) segmented with LIBRA on FOR PROCESSING and on FOR PRESENTATION images. Each marker represents an image. Robust linear fitting is reported in red (solid); identity line is dotted for reference. Spearman’s rank correlation index is (a) 0.88, (b) − 0.16 (p < 0.001). While a strong correlation exists betweeen breast areas, the negative correlation coefficient for dense area can be understood by the example in Fig. 1: often the dense area segmented on FOR PRESENTATION images is very small compared to the dense area segmented from FOR PROCESSING