Can I segment just the white matter of a group fod?

Hi all!
I used MSMT CSD on single shell DTI data and produced a group FOD.
Now I’m interested in doing some fixel-based analysis in just the white matter regions, so I want to produce a white matter mask of the FOD.
Is there a way to segment out or mask just the WM of the group FOD?
I think there should be, but I have not been able to figure it out. Thanks so much for any help!

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Dear Julia,

This is exactly what step 12. Compute a white matter template analysis fixel mask of the fixel-based analysis documentation is for.

Hope this helps!