thanks very much doug. cheers,
satra On Tue, Oct 8, 2013 at 11:55 AM, Douglas N Greve <gr...@nmr.mgh.harvard.edu>wrote: > > On 10/08/2013 09:17 AM, Satrajit Ghosh wrote: > > hi folks, > > > > i'm using mri_vol2surf to map functional time series into > > fsaverage3/4. my assumption is that each vertex time series will be > > the mean over an icosahedral patch corresponding to the vertex on > > fsaverage. is that how the resampling is done? also is the resampling > > done with a single interpolation? > If you spec fsaverageX as the target subject, then it first samples to > the individual subject then runs surf2surf to map to fsaverageX. First, > for each vertex on fsavergeX it looks for the nearest neighbor in the > individual. If fsaverageX is much sparser than the individual, then this > will leave a bunch of vertices unused in the individual. So it goes > through a second step where it maps all the unused vertices in the > individual to the closest vertex in fsaverageX. If a vertex in > fsaverageX has multiple vertices from the individual, then the final > value is the mean of the individual vertices (unless mapping volume or > areal quantities in which case it gets the sum). You can control these > options if you first map to the individual using vol2surf then use > surf2surf to map from individual to fsaverageX. > doug > > > > if it's a single step, is there a way to project the interpolation > > kernel corresponding to a vertex in fsaverage3 on the subject's own > > surface? > > > > cheers, > > > > satra > > > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > gr...@nmr.mgh.harvard.edu > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > 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. > >
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