Re: [Freesurfer] Question about Cortical Thickness

yes, that's true On Thu, 6 Oct 2016, Funk, Quentin wrote:

I have a few questions regarding the instructions at:

https://surfer.nmr.mgh.harvard.edu/fswiki/VolumeRoiCorticalThickness

The instructions assume that there is an ROI in the same space as the T1.mgz map. Then they do the following:

1. Register the T1 to fsaverage
2. resample the ROI to the cortical surface of fsaverage
3. map the thickness data of the subject to fsaverage
4. measure the thickness data

Why is the registering to fsaverage helpful? It seems as if this computation could be done in the native space. Why couldn't one make the following changes:

1. in mri_vol2surf, the reg option could be replaced with regheader MYSUB.
2. Then the surf2surf command becomes unnecessary.