I'm not sure what you are trying to do here. Ico7 is just a 7th order icosahedron and does not "belong" to any subject. What belongs to fsaverage or fsaverage_sym is the atlas of curvatures and registrations derived from them (eg, lh.sphere.reg). It might be easier to use mris_apply_reg rather than mri_surf2surf. One of the reasons I wrote mris_apply_reg was to apply the xhemi registrations because the structure of mri_surf2surf makes it really hard to get the specification right.
On 2/15/19 7:41 PM, Alon Baram wrote: > > External Email - Use Caution > > Hello, > > I am trying to understand some code I came across and am having > trouble understanding the difference between the target surface in > mri_surf2surf and the surface used as target for the registration. The > code first uses freesurfer_registerXhem register the subject's right > hemisphere to the left and register both hemispheres to fsaverage_sym, > producing the registration file fsaverage_sym.sphere.reg. > > I then use the following command: > > mri_surf2surf --srcsubject $subj --hemi lh --trgsubject > ico--trgicoorder 7 --surfreg fsaverage_sym.sphere.reg --srcsurfval > temp.curv --src_type curv --trgsurfval tempN.curv --trg_type curv > --mapmethod nnf --nsmooth-out 1 > > > to resample the registered subject surface to ico7. To my > understanding, ico7 is exactly the same as fsaverage, but fsaverage is > not exactly the same as fsaverage_sym. So I find it strange that the > code is using a registration file which is registered to one surface > (fsaverage_sym) with a different target surface (fsaverage). > > > I'm not sure which space the result will actually be in - fsaverage or > fsaverage_sym? > > I'm obviously missing something basic here. > > > Thanks very much for the help! > > > Alon > > > _______________________________________________ > 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
