Feng-Xian, The coordinates are surface coordinates. qdec does not display the Tal coords, but I think this will be added in a future release.
You can get the Tal coords using tksurfer. The surface displayed in qdec is the 'fsaverage' surface, so that can be loaded in tksurfer. First, in qdec, make note of the vertex number that you are displaying for your plot. Then load fsaverage in tksurfer: tksurfer fsaverage lh inflated (or 'rh' if right hemi). then, select Tools->Select Vertex and enter the vertex number. you should see the point highlighted in blue on the surface. the tal coords will be displayed in the tools window. you can get MNI tal coords by selecting View->Information- >Vertex MNI Talairach Nick On Sun, 2008-06-29 at 22:10 +0800, Feng-Xian Yan wrote: > > Hi, > I have some problems about surface coordinates. > After running the qdec and analyzed my data(cortical thickness), I > display a plot of the data for a particular vertex by left-clicking on > a point while holding down the Ctrl key. It shows a plot and its plot > window shows this vertex's surface coordinates. > 1) Does the surface coordinates differ from Talairach coordinates? > 2) If yes, can I translate the surface coordinates to Talairach > coordinates? > And how do I do? Does Freesurfer have some methods to do that? > > Thank you in advance. > Feng-Xian > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
