Hi Irene

what changed and by how much? The ICV will change a bit, and because of partial volume estimation there may be small changes to some volumes, but it shouldn't be much.

cheers
Bruce

On Fri, 10 Jan 2014, irene saviozzi wrote:

Hello,
I'm learning to use freesurfer.
I would understand if the tissue that is not brain (i.e. meninges, vessel
and skull), which is not automatically included in pial, must be deleted
with the manual editing or not.
I send you some screenshots as exemple.
In this cases, I can ignore skull and vessel out of the pial surface or I
have to delete them?
In this page ( http://freesurfer.net/fswiki/Edits ) they wrote : "Skull,
dura and blood vessels might interfere with surface formation and need to be
erased". Elsewhere they wrote that, in manual editing, leaving meninges it's
not a skull strip error.  
In the manual editing of the brainmask.mgz, I obtain different  values of
volumes (in the aseg.stats) if I delete skull, meninges and vessel or not.
thank you,
Irene

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