Hi Jimbo,

Are the images you have run fslstats on in MNI152 space? 

Even if they are, there are bound to be differences in the sum of the WM/GM/CSF PVEs, because registration is not perfect, and there will still be some inter-subject variability.

Cheers,

Paul

On 10 September 2018 at 17:23, Jimbo Connors <[log in to unmask]> wrote:
If the brain are registered in MNI space and I think this is what fsl_anat does, the total sum of the partial volume shouldn't be the same?
the total number of voxels ( for the three pve, gray, white and csf) and the dimension of curse are the same for the two subjects.

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