1) You can use mri_surf2surf to map data from an individual subject to our normalized (fsaverage) coordinate system.

2. Not sure what this means. In fsaverage space there really is no volumetric coordinate for a vertex, just it's location on the sphere. For individual subjects you can compute the coords of a vertex (see our wiki pages under coordinate systems), but not in the average space.

cheers Bruce

On Sun, 14 Apr 2013, Bharti Rana wrote:

Dear prof. Bruce Thanks once again. As you clarify that each brain has different number of vertices. But still I want to ask the followings:

1. How to map these on some standard template say Freesurfer template and

then retrieve cortical thickness for each vertices?

2. How to identify the location of each retrieved cortical vertices?

Kindly guide me for the same. I'll be highly thankful to you.

On Wed, Nov 21, 2012 at 8:19 PM, Bruce Fischl fischl@nmr.mgh.harvard.edu wrote: yes, each brain has a different number, sufficient to get about 1mm isotropic resolution. You can use our spherical averaging to map them to a common coordinate system with the same # of vertices if you want (I think mri_surf2surf will do this)

  cheers
  Bruce
  On Wed, 21 Nov 2012, Bharti Rana wrote:


        I am Bharti, a M.Tech./Ph.D student at School of
        Computer & Systems
        Sciences, Jawaharlal Nehru University, New Delhi,
        India. My area of interest
        is pattern recognition and image processing. In one
        of my research work, i
        used freely available freesurfer software to find
        cortical thickness using
        recon-all -all command.

        But, while retrieving cortcal thickness maps using
        read_curv() function, i
        am getting different number of vertices for
        different brains. Are different
        number of cortical vertices possible for two
        different brains? I have gone
        through FAQ provided by Freesurfer but i did not
        find any related answer.

        Kindly clarify.

        Thanks in advance.


         

         

         

        --

        Best Regards
        Bharti
        M.Tech./Ph.D.
        School of Computer & Systems Sciences
        Jawaharlal Nehru University
        NEW DELHI, INDIA

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-- Best Regards Bharti M.Tech./Ph.D. SC&SS JNU, NEW DELHI