Hi all,<br><br>Recently I have a problem about coordinate of freesurfer. I have reprocessed the MRI data to get the cortical thickness and then I want to get the indexes, coordinate and cortical thickness of a region of  interest(ROI). I have use the Surfstat toolbox of matlab to process the data.Now I want to use the function SurfStatROI ( function maskROI = SurfStatROI( centre, radius, surf ) ) to get the ROI, however,  I have known the MNI coordinates (x,y,z) only .I want to convert this MNI coordinates to the  freesurfer coordinates which can be used by SurfStatROI.center. That is ,if I use the function SurfStatReadSurf to read surf files (surf=SurfStatReadSurf(..)) to get the variable surf, then I can get surf.coord(:,index) by a index. How can the surf.coord() corresponding to the MNI coordinate systems or Talairach systems.<br>
<br>I have seen the website of Freesurfer coordinate systems (<a href="http://surfer.nmr.mgh.harvard.edu/fswiki/CoordinateSystems">http://surfer.nmr.mgh.harvard.edu/fswiki/CoordinateSystems</a>) but I can not solve my problem. Looking forward to your help sincerely.<br>
<br>Your sincerely!<br><br>Xiaoning Wu<br><br>Mar 20,2012<br>