[Mrtrix-discussion] mask wm.mif with the 4D_diffusion

[romain quentin]

Hi all,
i'm trying to create the wm mask "wm.nii" with a 4D image of diffusion and
the grad.b containing gradient table and the bvalue table in the good
format for mrtrix.
I use the command : gen_WM_mask -grad grad.b 4Ddata.nii mask.nii wm.nii (or
wm.mif)

If I use the nifti format for the wm mask, when i try to open wm.nii with
mrview, it tell me

"mrview: image "./wm.nii" is not in NIfTI format (sizeof_hdr != 348)
mrview: error opening image "wm.nii""

If I use the mif format, i can open the mask but it is totally black.

Can anyone help me?
Thank you very much

Romain
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