Figure 2

Example of the semiautomated segmentation of the subcutaneous fat area, visceral fat area, and skeletal muscle area at the L3 vertebral level. (a) The subcutaneous fat is marked blue and the visceral fat, green. (b) The skeletal muscle area is marked red. To determine skeletal muscle density, the mean Hounsfield unit (HU) value of the skeletal muscle area was automatically calculated.