On 01/07/2017 06:19 AM, Ling Zhao wrote: > > *Dear experts,* > > 1.From the FreeSufer wiki we all knows all of the processing and the > generated files are in the Talairach (MNI305) coordinate. The > FreeSurfer <http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FreeSurfer>operates > in a conformed space, which is different from the original structural > image space that it has received as an input. If I want to use the > generated surfaces or labels as masks (which is inTalairach space) for > DTI probtrackx (which is need in diffusion space). How should I do? > Which wiki page says that? Actually all of the processing is done in native (albeit "conformed") native anatomical space. To use the labels in a DTI analysis, you'll need to register the DTI (low-b volume) to the freesurfer subject (bbregister), then use mri_label2vol to map a segmentation (eg, aparc+aseg.mgz) into the DTI space. See the multimodal tutorial. > > 2.In your wikiI see the information as following: > > “*Average Surface Construction* > > The average surface is constructed by computing the Talairach (MNI305) > coordinate at each vertex for each subject (based on the talairach.xfm > matrix for that subject). These coordinates are then mapped into the > common surface space and averaged together so that the coordinate of a > vertex in the common surface space is the average of the Talairach > coordinates from the corresponding surface locations of the > individuals. This results in the average surface overlaying nicely on > the average (MNI305) volume. ” > > Is the MNI305 in the MNI space? Can you tell me the meaning of the > MNI305 in “Talairach (MNI305) coordinate”? > > After the average surface overlaying nicely on the average (MNI305) > volume. Is the average surface in the MNI space or in the Talairach > space / common surface space? > It is in MNI305 space which is defined by the MNI305 average brain. This is similar to the MNI152 space (the "standard" MNI space) but not identical. We also report a "Talairach" space coordinate. This is computed by applying a formula to the MNI305 coordinates > > Best wishes > > Ling Zhao > > > -- > > Center for the Study of Applied Psychology, Key Laboratory of Mental Health > and Cognitive Science of Guangdong Province, School of Psychology, South > China Normal University, Guangzhou 510631, P. R. China > > > > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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