IVIM dataset

IVIM.nii.gz is an acquired IVIM dataset with 21 b-values acquired in 3 directions, registered to each other and the directions were averaged into one. So this dataset is 4D where the 4th dimension is the b-values.

IVIM.bvecs are the b-vectors, which are just the 3 directions averaged.

IVIM.bvals are the 21 b-values of the acquisition.

fit.nii.gz is 4D with the 4th dimension as each of the fitted values S0, f, D, D*.