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. 2019 May 19;8(5):712. doi: 10.3390/jcm8050712

Figure 1.

Figure 1

Representative CT images of L1 skeletal muscle area measurement: A patient with low L1 SMI (A) and a patient with high L1 SMI (B). Total skeletal muscle area was measured using the following four components: Paraspinal muscle (red), extracostal abdominal wall muscle (yellow), intercostal muscle (blue), and psoas muscle and diaphragm (purple). The measured L1 SMAs were 36.24 (A) and 149.56 cm2 (B), and L1 SMIs were 16.00 (A) and 49.68 cm2/m2 (B), respectively. CT = computed tomography; L1 = first lumbar vertebra; SMA = skeletal muscle area; SMI = skeletal muscle index.