Fig. 2.

Reproducibility of DTI derived metrics in selected white matter structures. We illustrate each of the evaluated white matter structures on the mean (trace-weighted) diffusion image, on the fractional anisotropy and on the colorized fractional anisotropy maps (left column). The reproducibility of the fractional anisotropy (FA), axial diffusivity (AD), radial diffusivity (RD) and the mean diffusivity (MD) is given as the coefficient of variability (CV%) across the repeated scans. The distribution of CV% across the study population for each white matter structure and for each evaluated DTI metric is graphed separately (right column). In each diagram, the Whisker plots represent the interquartile range (bar), mean value (horizontal line), median value (cross), outliers (circles), while the histogram demonstrates the distribution of CV% values for each DTI metric separately.