Thank you for responding. So before you responded, I tried a few things out. one of them was to make the edit to the image and then run recon-all with "-autorecon2-noaseg -autorecon3". I found this to move the surface however the aparc+aseg file had the voxel I altered as 247. Last night I tried what you suggest with the same alterations to the aseg.presurf file, I found the surface and aparc+aseg was unchanged.

On Wed, Dec 23, 2020 at 12:28 PM Greve, Douglas N.,Ph.D. <DGREVE@mgh.harvard.edu> wrote:

I don't have any example, but the idea is pretty simple. If you want to freeze a point on the surface, open aseg.presurf.mgz and the surfaces for your subject, eg,
tkmeditfv subject nu.mgz -seg aseg.presurf.mgz -surfs
Then edit the aseg.presurf.mgz to change the voxels where you want to freeze to value 247 (FreezeSurface in $FREESURFER_HOME/FreeSurferColorLUT.txt)
Then run recon-all with -autorecon2-surfonly -autorecon3

On 12/22/2020 12:08 PM, Aaron Tanenbaum wrote:
External Email - Use Caution

So I never got a response for my question. At least can someone tell me the recon-all flags needed after editing the aseg.presurf.mgz file. I am also assuming that this feature is also available for 7.1.1.

On Wed, Dec 16, 2020 at 10:27 AM Aaron Tanenbaum <aaron.b.tanenbaum@gmail.com> wrote:

I am curious about a feature introduced in FS 7.0 In the release notes it says, "Ability to freeze the surface at points labeled 247 in the aseg.presurf.mgz" I was interested to know what this feature can do. Do you have any examples of when this should be used?

Aaron Tanenbaum
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