Hi there
I tested registering a subject's pial surface to fsaverage and compared the original pial (from recon-all) with this registered pial surface. It turns out that they are almost identical in nature, and I am wondering how this is possible if recon-all does not alter the input data.
Below is the command that I ran. Is there something I am missing here?
many thanks
Trisanna
trisanna@kaplan:~$ mri_surf2surf --srcsubject icbm-102 --sval-xyz pial --trgsubject fsaverage --tval-xyz --tval lh.pial.icbm102 --hemi lh srcsubject = icbm-102 srcval = (null) srctype = trgsubject = fsaverage trgval = lh.pial.icbm102 trgtype = srcsurfreg = sphere.reg trgsurfreg = sphere.reg srchemi = lh trghemi = lh frame = 0 fwhm-in = 0 fwhm-out = 0 label-src = (null) label-trg = (null) OKToRevFaceOrder = 1 Reading source surface reg /data-01/trisanna/freesurfer/icbm-102/surf/lh.sphere.reg Loading source data Reading surface file /data-01/trisanna/freesurfer/icbm-102/surf/lh.pial Reading target surface reg /data-01/trisanna/freesurfer/fsaverage/surf/lh.sphere.reg Done Mapping Source Volume onto Source Subject Surface surf2surf_nnfr: building source hash (res=16). Surf2Surf: Forward Loop (163842)
surf2surf_nnfr: building target hash (res=16). Surf2Surf: Reverse Loop (169941) Reverse Loop had 44416 hits Surf2Surf: Dividing by number of hits (163842) INFO: nSrcLost = 0 nTrg121 = 131435, nTrgMulti = 32407, MnTrgMultiHits = 2.37057 nSrc121 = 140014, nSrcLost = 0, nSrcMulti = 29927, MnSrcMultiHits = 2.28035 Saving target data
-- Ph.D. Candidate McGill University Integrated Program in Neuroscience Psychology