oh, if the overlay vector is already computed on the downsampled surface then you are all set (it doesn't just downsample, but also maps to fsaverage)
cheers Bruce On Tue, 20 Dec 2011, Ecker, Christine wrote: > Many thanks for your reply. > > Unfortunately the option -sval didn't work and it is still using the old > sphere.reg file. > > I was however wondering whether mri_surf2surf already sorts vertices and > hence makes them comparable. For instance, is vertex 1 on the resampled > surface the closest match to vertex 1 on the target surface? In that case, > I would not even have to map data back to fsaverage6. > > Best, > Christine > > > > > On 20/12/2011 15:53, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote: > >> Hi Christine >> >> I think you do it the same way, just using -sval instead of -sval-xyz >> (since you are mapping a scalar field instead of the coordinates). >> >> cheeers >> Bruce >> On Tue, >> 20 Dec 2011, Ecker, Christine wrote: >> >>> Dear FreeSurfer Experts, >>> >>> I would like to down-sample the pial surface of individual subjects to >>> have >>> the same number of vertices as fsaverage6. I have done so using: >>> >>> mri_surf2surf --hemi lh --srcsubject 'subjectID' --sval-xyz pial >>> --trgsubject fsaverage6 --trgicoorder 6 --trgsurfval 'outputfilename' >>> >>> This worked well and the pial output surface has 40962 vertices. I now >>> have >>> an overlay vector, which was computed on the down-sampled pial surface, >>> which I would like to map back to fsaverage6 in order to perform a group >>> comparison. >>> >>> Please could you advise on how to do this as all scripts I am aware of >>> (e.g. >>> mris_preproc) use sphere.reg, which has ~150000 vertices. >>> >>> Many thanks, >>> Christine >>> >>> >> >> >> The information in this e-mail is intended only for the person to whom it >> is >> addressed. If you believe this e-mail was sent to you in error and the >> e-mail >> contains patient information, please contact the Partners Compliance >> HelpLine at >> http://www.partners.org/complianceline . If the e-mail was sent to you in >> error >> but does not contain patient information, please contact the sender and >> properly >> dispose of the e-mail. >> > > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
