Thanks for the answers - Freesurfer

22 Dec 2008


      Hi Doug and Bruce,
Thanks for your answers. One more question, why the vertex RAS of the  
same spot on the brain given in TkSurfer is not the ones I read by  
Matlab program freesurfer_read_surf?
The commands I am using are:
[vertex_coords, faces] = freesurfer_read_surf('tutorial_subjs/subject/ 
surf/lh.inflated');
tksurfer subject lh inflated
Thanks,
YJ
if you have the voxel index (col, row, slice) then you can:
V2R = [
-1.00000    0.00000    0.00000  128.00000
  0.00000    0.00000    1.00000 -128.00000
  0.00000   -1.00000    0.00000  128.00000
  0.00000    0.00000    0.00000    1.00000 ]
crs = [col row slice]';
xyz = V2R[crs+1; 1];
then find the vertex whose xyz coors are closest to xyz
Yunjie Tong wrote:
...
Hi freesurfer experts,
I have a single subject anatomical data in freesurfer. If I know  
the  volume index of a point on the surface of the cortex ( from  
T1.mgz in  TkMedit), how can I find out the corresponding vertex  
index or the  vertex RAS in TkSurfer. Thanks. BTW, I am using matlab.
Thanks,
Yunjie
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Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
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