Hi Donna,

In that same paper we also comment on the differences between expansion/contraction and absolute areal measurements assessed at each face of the surface (i.e., facewise), which can, after interpolation, be converted to vertexwise to facilitate analysis using current tools (e.g., mri_glmfit or qdec), without loss of areal quantities.

All the best,

Anderson

On 11 October 2014 04:05, Donna Dierker <donna@brainvis.wustl.edu> wrote:

Hi Emma,

I might not be the only one who is unsure what you mean by a vertex-wise cortical surface area measure. Do you mean something like what is illustrated in figures 2 and 3 here:

http://www.pnas.org/content/107/29/13135.figures-only

… which is similar, but not identical to the local gyrification index?

If so, would you use this measure on surfaces before or after registration to a target atlas?

Donna

On Oct 10, 2014, at 4:19 PM, Emma Thompson <voneconomos@gmail.com> wrote:

> Dear Freesurfers,
> I recently heard that there are several disadvantages to using a measure of cortical surface area in Freesurfer, specifically due to conducting a vertex-wise analysis. Can someone help me understand why a measure of surface area using this approach might be flawed? Thanks!

_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

The information in this e-mail is intended only for the person to whom it is
addressed. If you believe this e-mail was sent to you in error and the e-mail
contains patient information, please contact the Partners Compliance HelpLine at
http://www.partners.org/complianceline . If the e-mail was sent to you in error
but does not contain patient information, please contact the sender and properly
dispose of the e-mail.