So if I understand, you used mri_surf2surf to map the curv from your
subject to fsaverage. You then viewed the original curv on the original
subject and then you viewed the fsaveage-mapped curv on faverage and you
find that they are very similar. Is that right? This would not surprise
me much. If you still have questions, pictures would help alot


On 07/21/2016 10:50 AM, Trisanna Sprung-Much wrote:
> Hi Doug
>
> What I mean to say is that the pial surface created by recon-all and
> the pial surface that has been nonlinearly registered to fsaverage
> look pretty much identical in sulcal patterns, but I do not understand
> how this can be the case if one surface has been registered to a
> surface template based on cortical folding.
> Shouldn't the cortical folding for this registered surface change even
> a little bit?
>
> best
> Trisanna
>
>
> --
> Ph.D. Candidate
> McGill University
> Integrated Program in Neuroscience
> Psychology
>
>
> On Tue, Jul 19, 2016 at 10:29 PM, Douglas Greve

> <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote:
>
>     I don't understand what you did or what the problem is. Can you
>     elaborate?
>
>
>     On 7/19/16 5:23 PM, Trisanna Sprung-Much wrote:
>>     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
>>
>>
>>
>>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
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