Thank you for your help! I created a registration template and atlas from scratch could I input that in the interhemispheric registration analysis?
The ROIs for the diffrerent regions per hemisphere are 50-100 vertices On Oct 24, 2016 5:03 PM, "Douglas N Greve" <gr...@nmr.mgh.harvard.edu> wrote: > It would depend on how big the ROI is to begin with. Do you know that we > have our own interhemispheric analysis that might be better for this? > Check out > > http://surfer.nmr.mgh.harvard.edu/fswiki/Xhemi > > > On 10/24/2016 12:33 PM, Daya P wrote: > > Hi Bruce, > > > > I drew ROIs on an initial subject and then after registering all other > > subjects to the initial one, used mri_label2label to map the ROIs from > > the initial subject to subsequent ones. > > I am interested in looking at asymmetry between left and right regions. > > > > I had two concerns, one that the ROIs have different # vertices on > > different subjects, but as you mentioned the nonlinear process makes > > sense, since each subject does not have the exact same brain size and > > curvature. > > > > Another concern was that the ROIs on the left and right hemisphere in > > a subject do not have the exact same number of vertices. Would a > > difference of 10 vertices max bias results? > > > > Thank you for your help, > > > > Daiana R. Pur > > Research Assistant > > Canadian Surgical Technologies & Advanced Robotics > > Brain and Mind Institute > > Western University > > London, ON, N6A 5B7 > > Canada > > > > On Mon, Oct 24, 2016 at 12:09 PM, Bruce Fischl > > <fis...@nmr.mgh.harvard.edu <mailto:fis...@nmr.mgh.harvard.edu>> wrote: > > > > Hi Daiana > > > > yes, that is to be expected given the nonlinear nature of the > > cross-subject registration. It shouldn't bias things, although > > you'll need to give us more details if you want a more definitive > > answer. > > > > cheers > > Bruce > > > > > > > > On Mon, 24 Oct 2016, Daya P wrote: > > > > Hi All, > > > > My question is about using mri_label2label. When mapping the > > labels from one > > subject to another the number of vertices of each ROI is > > different. Is that > > something to be expected? > > > > How much of a difference does a number of vertices of 50 > > compare to 40 have > > on measures like thickness, grey matter and surface area? > > > > I would really appreciate some help > > > > Thank you, > > > > Daiana R. Pur > > Research Assistant > > Canadian Surgical Technologies & Advanced Robotics > > Brain and Mind Institute > > Western University > > London, ON, N6A 5B7 > > Canada > > > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu <mailto:freesur...@nmr.mgh. > harvard.edu> > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > <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 > > <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 > > -- > 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 >
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