[Freesurfer] Project functional region into white matter

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Hello all,

I have a series of functionally-defined ROI volumes (.nii format) that I'd like to project into the white matter to then be used for tractography.

So far the vols have been brought from cvs_avg35 space into subject space from using mri_vol2vol and the corresponding m3z file. This was followed by mri_vol2vol using the registration from bbregister to get the functional regions into diffusion space.

I have done this for the ROIs in their original GM volume, but would now like to also have corresponding WM volumes for tractography.

What is the best way to go about doing this?

Thanks,

Corinna