Figure 1.

Segmented soft tissues and compositions within the tibialis anterior from (a) the healthy control subject, (b) the elderly subject, and (c) the pathological subject. Three tissue types of distinct radiodensitometric domains were utilized for the purposes of this study as follows: [−200 to −10], [−9 to 40], and [41 to 200] HU representing, respectively, fat (yellow), loose connective tissue and atrophic muscle (cyan), and normal muscle (red). Note that the fat voxel elements of the right (healthy) muscle of this patient were almost entirely superficial (visible on the surface of the segmentation model).