Hi Pam,
1. The variance downweights features that are variable across subject, and
let’s the registration depend on more stable features like
central/calcarine/sylvian in a smooth manner.
2. The surfaces for a given hemisphere all have the same topology (# of
vertices,edges,faces) and vertex index is preserved, so it is trivial to look
up the “same” vertex on the different surfaces.
Make sense?
Cheers
Bruce
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> On Behalf Of Pam Garcia
Sent: Thursday, September 24, 2020 1:03 AM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] parameterization template and the vertex correspondence
in the pial surface
External Email - Use Caution
Hi FreeSufer team.
I have some questions related to the parameterization template and the vertex
correspondence in the pial surface.
1. In the parameterization template what is the reason for using the mean
and variance of curvature for WM surface using the inflated and smoothed
surface? What independent information do these measures supply?
2. Related to the vertex correspondence. How is the spherical surface
mapped to the pial surface to achieve vertex correspondence between the WM and
pial surfaces?
Thanks a lot for the responses
best
Pam
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