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Thanks Doug.

I added --ribbon ribbon.gz to the mri_vol2surf command but the output was exactly the same as omitting it. I think mri_vol2surf automatically loads ribbon.mgz when I include the --subject sub01.

Just for my understanding, why shouldn't they look exactly the same if all I'm doing is going from vol2surf and back (surf2vol) using the same ROI?
I guess when I convert a volumetric ROI to a surface with mri_vol2surf I will lose volumetric information which I cannot recover with mri_surf2vol, is that right?

Best regards,

Sam

On Wed, Jul 8, 2020 at 4:59 PM Douglas N. Greve <dgreve@mgh.harvard.edu> wrote:

They will not look exactly the same. Try adding --ribbon ribbon.mgz

On 7/6/2020 10:47 PM, Sam W wrote:
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Hi,

I'm trying to understand mri_surf2vol and mri_vol2surf but I'm not able to get the expected output when converting a surface back to volume.

These are the commands I'm using:

mri_vol2surf --mov lh_fusiform_pre.nii.gz --ref mri/orig.mgz --regheader sub01 --o lh_fusiform.gii --hemi lh
mri_surf2vol --o lh_fusiform_post.nii.gz --subject sub01 --so surf/lh.white lh_fusiform.gii

shouldn't lh_fusiform_pre and lh_fusiform_post look the same? lh_fusiform_post looks fragmented.

Best regards,

Sam
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