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> 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 > 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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