Fig. 2From: Radiomics in photon-counting dedicated breast CT: potential of texture analysis for breast density classificationExample definitions of regions of interest for each breast density level (a, b, c, or d) and corresponding histogram graphs summarised for all 50 automatically evaluated images. Histograms depict the number of pixels found at each pixel value; whereas the left side on the x-axis represents lower signal values, the right side on the x-axis represents higher signal values. In the histograms, two peaks can be distinguished corresponding to fatty and glandular tissue, respectively. The ratio between the two peaks depends on the breast density, with class a mostly showing the peak corresponding to fatty tissue, whereas the histogram graph for class d demonstrating mostly the peak corresponding to glandular tissueBack to article page