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Table 1 Comparison of muscle CSA by MRI and US. Mean (SD), ICC, and SEM with confidence intervals for muscle CSA

From: Leg muscle cross-sectional area measured by ultrasound is highly correlated with MRI

  US CSA (SD), cm2 US ICC (95% CI) US SEM (95% CI for muscle size), cm2 Minimum Detectable Difference, cm2 MRI CSA (SD), cm2 MRI ICC (95% CI) MRI SEM (95% CI for muscle size), cm2 Minimum Detectable Difference, cm2
Tibialis Anterior
30%
6.60 (1.20) 0.996
(0.992, 0.998)
0.085
(6.43, 6.77)
0.236 6.88 (1.28) 0.963
(0.930,0.980)
0.250
(6.39, 7.37)
0.693
Tibialis Anterior 50% 5.39 (1.28) 0.985
(0.973, 0.992)
0.162
(5.07, 5.71)
0.449 5.69 (1.42) 0.991
(0.982,0.995)
0.135
(5.43, 5.95)
0.374
Tibialis Posterior 30% 3.96 (1.01) 0.998
(0.996, 0.999)
0.045
(3.87, 4.05)
0.125 4.18 (1.27) 0.958
(0.921, 0.978)
0.260
(3.67, 4.69)
0.721
Tibialis Posterior 50% 3.44 (1.10) 0.997
(0.995, 0.997)
0.060
(3.32, 3.56)
0.166 3.72 (1.33) 0.999
(0.999, 1.00)
0.013
(3.69, 3.74)
0.036
Flexor Digitorum Longus 1.66 (.569) 0.990
(0.983, 0.995)
0.054
(1.55, 1.77)
0.150 1.71 (.52) 0.995
(0.990, 0.997)
0.044
(1.62, 1.80)
0.122
Fibularis Longus 5.26 (1.25) 0.996
(0.993, 0.998)
0.073
(5.11, 5.40)
0.202 5.26 (1.14) 0.998
(0.995,0.999)
0.003
(5.25, 5.27)
0.008
Fibularis Brevis 4.18 (.973) 0.993
(0.987, 0.996)
0.074
(4.03, 4.33)
0.205 4.38 (.942) 0.997
(0.994,0.998)
0.003
(4.37, 4.39)
0.008