Figure 1

Body Composition Components Estimated by Dual x-ray Absorptiometry and Magnetic Resonance Imaging. There is a shaded gray barrier between the estimated skeletal muscle mass block and the organ and other soft tissue block in the 4th column under "dual x-ray absorptiometry" estimates. This conveys the SMM_DXA is an estimate of total body musculature based on limb muscle mass only. Thus there is likely to be variability in the accuracy of SMM_DXA values for individual subjects with respect to the estimated amount of axial musculature (e.g., for some it may be overestimated, for others it may be underestimated).