Fig 4.

Comparison between the repeatability of the four myelin-sensitive metrics when the metric is estimated (A) in the whole WM by vertebral level and (B) from C2 to C4 within WM sub-ROIs. Repeatability indexes from left to right: mean absolute test-retest difference ($\overline{\left|\mathrm{d}\right|}$), Intra-Class Correlation (ICC) coefficient, Minimal Detectable Change (MDC). $\overline{\left|\mathrm{d}\right|}$ and MDC are expressed in percentage of inter-subject SD in order to assess the repeatability relative to the differentiation between subjects (i.e., the reliability), despite the different units of the metrics.