Intrarater, scan-rescan, and inter-rater variability of FA measurements along the CST
| Mean of All Positions | Inter-Rater Variability at Different Positions along the CST | ||||||
|---|---|---|---|---|---|---|---|
| Intrarater | Scan-Rescan | Inter-rater | 1 | 2 | 3 | 4 | |
| CV | 2.4% | 3.0% | 5.7% | 4.5% | 4.6% | 7.9% | 6.0% |
| Mean value of abs. differences | 0.016 | 0.020 | 0.034 | 0.028 | 0.030 | 0.051 | 0.030 |
| FAmean | 0.67 | 0.66 | 0.602 | 0.619 | 0.658 | 0.642 | 0.492 |
Note:—FA indicates fractional anisotropy; CST, corticospinal tract; CV, coefficient of variation defined as mean value of absolute differences divided by FAmean; FAmean, mean value of FA measurements of the respective variability assessment. See Fig 1 for definition of positions 1 to 4.