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:
- How to map these on some standard template say Freesurfer template and
then retrieve cortical thickness for each vertices?
- 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, INDIAThe 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.
-- Best Regards Bharti M.Tech./Ph.D. SC&SS JNU, NEW DELHI