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Contrast-free measurements in healthy volunteers. (A) Average signal enhancement curves (n = 15) in normal-appearing white matter (NAWM) and deep grey matter (DGM), showing a drift in signal intensity; error bars indicate the mean ± standard error. (B) T1 measurements obtained before and after the DCE-MRI sequence using the inversion recovery method (n = 7); error bars indicate the mean ± 1.96 standard deviations.
