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The components are the areas segmented using HU thresholds to represent biological and clinical tissue components, including SMA (composed of NAMA and LAMA) and IMA. HU = Hounsfield unit, IMA = intermuscular adipose tissue area, LAMA = low attenuation muscle area, LD-kVp = low dose with reduced voltage, LD-mAs = low dose with reduced current, NAMA = normal attenuation muscle area, SMA = skeletal muscle area
