Hi Jason
you could try using mris_expand with a negative # of millimeters. At 4mm
you will lose a lot of the gyri and the procedure will probably fail, but
for smaller amounts it should work (and is what we've done in the past).
You can also use mris_distance_transform to compute the distance transform
for the wm and use negative distances to find the distance into the
interior
cheers
Bruce
On Wed, 19 Jun 2013, Jason Reed wrote:
> Dear FreeSurfer Experts,
>
> I am attempting to construct surfaces that are 1, 2, 3, and 4 mm
> interior from the GM/WM boundary (?h.white). So going gradually deeper
> into white matter from the GM/WM boundary. I have successfully used
> mris_fill to fill the ?h.white surface and mri_morphology to erode the
> resulting volume, but I'm not sure on the correct procedure to create
> the new surfaces. Any advice or suggestions on tools with options to
> use will be greatly appreciated!
>
> My eventual goal is to project coregistered DTI data onto these more
> interior white matter surfaces.
>
> Thanks!
> -Jason
>
>
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