Fig. 3
From: Classification of fibroglandular tissue distribution in the breast based on radiotherapy planning CT
Description of radial glandular fractions (RGF) measurement: a Coronal CT image (processed, see Fig. 2): white circle encompasses the whole breast, and blue dotted circle is an example circle with relative radius (r) for which RGF(r) is calculated; b RGF of the slice in a; c. Breast is evenly divided into three regions: posterior (region 1), middle (regions 2), and anterior (region 3) middle slices s1, s2, and s3, respectively