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Test-retest velocity analysis in one volunteer. a) The full 3D velocity vector field used for the voxel-by-voxel analysis with the delineation of the regions of interest for the regional analysis. b) Voxel-by-voxel analysis: Bland-Altman comparison (top), orthogonal regression (center) and histogram of the angle difference distribution (bottom, with median angle difference in white). c) Regional analysis: mean velocity values for test and retest in the six regions displayed in (a).
