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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: J Magn Reson Imaging. 2011 May 23;34(1):107–119. doi: 10.1002/jmri.22596

TABLE 1.

Reproducibility of DTI indices in Calf Muscle Compartments at 1.5 T

MG λ1 λ2 λ3 FA x-axis y-axis z-axis
N PF N PF N PF N PF N PF N PF N PF
AV 1.98* 1.84 1.44 1.46 1.30 1.33 0.23* 0.18 83.25 78.80 89.92 84.91 12.08* 20.88
STD 0.02 0.05 0.07 0.04 0.09 0.04 0.04 0.03 3.48 5.69 5.67 4.54 2.64 3.71
CV-av 1.28 2.73 1.50 2.14 3.68 3.13 6.93 3.27 3.80 4.46 5.68 4.79 14.24 14.87
RC-av 0.07 0.14 0.06 0.09 0.13 0.12 0.04 0.02 8.80 9.78 13.95 11.18 4.92 8.08
LOA-L −0.03 −0.10 −0.02 −0.03 −0.06 −0.06 −0.04 −0.03 −7.85 −5.06 −5.18 −11.28 −1.48 −7.80
LOA-U 0.05 0.06 0.04 0.07 0.08 0.08 0.02 −0.01 4.61 8.78 14.56 4.54 5.48 3.63
LG λ1 λ2 λ3 FA x-axis y-axis z-axis
N PF N PF N PF N PF N PF N PF N PF
AV 2.10 2.06 1.42 1.43 2.03 2.09 0.27 0.25 106.21 106.95 87.35* 81.05 20.02 22.41
STD 0.11 0.12 0.06 0.08 0.80 0.90 0.02 0.03 3.53 1.61 6.62 3.23 4.16 3.38
CV-av 3.30 4.49 1.92 5.72 4.12 4.63 8.98 9.80 2.32 1.14 3.17 3.02 13.87 14.66
RC-av 0.19 0.26 0.07 0.23 0.14 0.16 0.07 0.07 6.84 3.37 7.46 6.75 7.90 8.99
LOA-L −0.12 −0.24 0.05 0.00 0.04 −0.02 −0.10 −0.12 −0.42 0.11 −7.01 −5.76 −1.70 3.83
LOA-U 0.08 0.12 0.21 0.32 0.20 0.22 −0.02 −0.02 7.33 4.88 4.30 3.79 15.78 16.56
AT-S λ1 λ2 λ3 FA x-axis y-axis z-axis
N PF N PF N PF N PF N PF N PF N PF
AV 1.96 1.96 1.5* 1.42 1.25* 1.11 0.24* 0.29 93.54* 85.28 107.58* 99.20 19.42* 11.52
STD 0.04 0.05 0.05 0.05 0.02 0.04 0.02 0.01 5.38 2.92 6.32 3.25 6.19 3.09
CV-av 1.65 1.97 3.53 3.93 3.87 4.25 9.36 3.65 4.60 2.82 4.45 2.50 26.21 27.08
RC-av 0.09 0.11 0.15 0.15 0.13 0.13 0.06 0.03 11.91 6.61 13.06 6.94 13.25 8.65
LOA-L −0.02 −0.06 0.00 −0.05 −0.19 −0.17 0.01 0.01 −2.31 0.75 −3.56 −4.51 −1.18 −9.10
LOA-U 0.10 0.10 0.20 0.17 −0.01 0.01 0.09 0.05 14.55 10.11 14.92 5.32 17.57 3.14
AT-D λ1 λ2 λ3 FA x-axis y-axis z-axis
N PF N PF N PF N PF N PF N PF N PF
AV 2.01 2.00 1.49* 1.43 1.27* 1.17 0.24* 0.27 85.34 85.62 94.59 93.87 8.37 6.86
STD 0.03 0.02 0.06 0.03 0.06 0.02 0.01 0.01 3.15 2.09 4.01 1.71 3.41 1.11
CV-av 1.25 2.19 4.28 3.69 3.99 1.35 6.50 2.14 3.35 2.32 2.32 2.06 37.41 18.71
RC-av 0.07 0.12 0.18 0.15 0.14 0.04 0.04 0.02 7.89 5.50 6.21 5.36 8.75 3.55
LOA-L −0.07 −0.05 −0.02 −0.04 −0.22 −0.07 0.00 0.00 −5.93 −2.84 3.67 −0.65 1.00 −0.99
LOA-U 0.03 0.13 0.22 0.16 −0.02 −0.01 0.06 0.02 5.24 4.94 12.47 6.94 13.38 4.03

Eigenvalues are x10−3 mm2/sec; FA is dimensionless and the fiber orientations with the x-, y-, and z-axis are in degrees.

*

significant differences between neutral and plantarflexed foot positions are shown with * (p<0.05)

λ1, λ2, λ3 are the eigenvalues, FA is the fractional anisotropy, x-axis, y-axis, z-axis refers to the lead eigenvector angle (in degrees) with the x-, y-and z-axis; N: neutral and PF: plantarflexed foot position; MG: medial gastrocnemius, LG: lateral gastrocnemius, AT-S: anterior tibialis, superficial compartment, AT-D: anterior tibialis, deep compartment; AV: average, STD: standard deviation, CV-av: average coefficient of variation, RC-av: average repeatability coefficient; LOA-L: limit of agreement (lower), LOA-U: limit of agreement (upper).