Table 4. Assessment of SMI, SAT and VAT values on CT, MRI T1-weighted and MRI T2-weighted images, performed on subgroups derived according to BMI and sarcopenia.
| Body composition values | CT | MRI T1 | MRI T2 | |
|---|---|---|---|---|
| Semi | Auto | |||
| Underweight | ||||
| SMI (cm2/m2) | 33.79±3.37 | 37.89±4.93 | 30.86±3.19 | 31.27±6.16 |
| SMA (cm2) | 93.1±12.10 | 105.2±20.78 | 85.6±16.91 | 84.8±9.27 |
| SM CT density (HU) | 31.9±10.86 | 31.9±7.68 | – | – |
| SAT (cm2) | 75.6±29.94 | 56.4±34.62 | 64.8±28.44 | 62.2±28.42 |
| SAT CT density (HU) | −68.0±21.70 | −72.0±15.96 | – | – |
| VAT (cm2) | 31.5±28.21 | 27.2±22.91 | 32.6±19.17 | 40.6±24.33 |
| VAT CT density (HU) | −60.6±16.14 | −77.7±5.39 | – | – |
| Normal weight | ||||
| SMI (cm2/m2) | 43.57±7.78 | 42.81±7.85 | 40.82±6.92 | 42.51±8.27 |
| SMA (cm2) | 124.4±27.02 | 122.2±26.12 | 121.1±25.89 | 116.5±23.70 |
| SM CT density (HU) | 22.8±11.44 | 28.8±7.54 | – | – |
| SAT (cm2) | 170.3±65.70 | 157.2±63.66 | 145.2±57.81 | 142.8±59.09 |
| SAT CT density (HU) | −99.1±14.10 | −97.1±13.32 | – | – |
| VAT (cm2) | 130.0±76.45 | 122.8±74.87 | 121.6±70.07 | 136.4±74.02 |
| VAT CT density (HU) | −85.5±15.49 | −89.9±15.56 | – | – |
| Overweight | ||||
| SMI (cm2/m2) | 54.38±16.58 | 51.02±19.18 | 50.09±13.87 | 51.36±11.94 |
| SMA (cm2) | 148.5±33.43 | 138.5±33.37 | 141.3±31.48 | 137.3±31.39 |
| SM CT density (HU) | 17.7±12.38 | 25.5±8.08 | – | – |
| SAT (cm2) | 261.7±72.51 | 266.8±96.96 | 220.4±61.43 | 213.0±62.64 |
| SAT CT density (HU) | −103.5±8.01 | −100.3±6.58 | – | – |
| VAT (cm2) | 245.0±98.26 | 222.5±115.89 | 225.8±98.78 | 244.0±108.33 |
| VAT CT density (HU) | −116.1±143.47 | −88.8±25.67 | – | – |
| Sarcopenic | ||||
| SMI (cm2/m2) | 38.1±5.69 | 39.3±5.75 | 37.3±6.95 | 36.5±5.86 |
| SMA (cm2) | 109.0±23.77 | 112.5±23.23 | 106.9±26.15 | 104.4±23.16 |
| SM CT density (HU) | 24.3±11.66 | 28.8±7.21 | – | – |
| SAT (cm2) | 157.2±95.25 | 143.8±82.26 | 140.8±79.45 | 136.0±77.20 |
| SAT CT density (HU) | −93.3±19.64 | −91.4±15.7 | – | – |
| VAT (cm2) | 115.4±95.25 | 112.7±96.73 | 112.3±94.63 | 124.6±102.82 |
| VAT CT density (HU) | −79.0±19.02 | −87.3±9.66 | – | – |
| Non sarcopenic | ||||
| SMI (cm2/m2) | 53.3±13.34 | 50.0±15.89 | 50.5±10.47 | 48.5±11.71 |
| SMA (cm2) | 147.0±28.74 | 137.5±30.31 | 139.6±27.24 | 134.2±27.73 |
| SM CT density (HU) | 19.8±12.51 | 27.2±8.46 | – | – |
| SAT (cm2) | 222.8±78.75 | 220.4±98.96 | 182.7±63.07 | 179.2±96.56 |
| SAT CT density (HU) | −101.5±11.85 | −99.7±11.19 | – | – |
| VAT (cm2) | 198.0±99.44 | 177.9±105.93 | 180.0±92.47 | 197.8±96.56 |
| VAT CT density (HU) | −106.0±114.09 | −89.4±24.63 | – | – |
SMI, skeletal muscle index; SAT, subcutaneous adipose tissue; VAT, visceral adipose tissue; CT, computed tomography; MRI, magnetic resonance imaging; BMI, body mass index; SMA, skeletal muscle area; SM, skeletal muscle; HU, Hounsfield units.