Hi Anne I suspect that if you removed enough manually it would change. The atlas-based registration will change if the skull-stripping changes significantly, which will change the resulting segmentation.
cheers Bruce On Sun, 20 Mar 2011, Hendrikx, A.A.E.M. (Anne) wrote: > Dear all, > > We, members from the Donders Institute Nijmegen (The Netherlands), are using > FreeSurfer to calculate amygdala volumes on MRI's. After a couple of tests we > are suprised about the following: > > We are wondering why the amygdala volume changes, after changing the > watershed threshold. Besides, if we should nog change the ws-treshold, but > manually remove remaining skull, the amygdala volume will not change. > > We don't understand this. Can anyone explane this to us? And besides, what > consequences are there for the accuracy of the calculations? > > Best wishes, > > Anne Hendrikx > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > _______________________________________________ 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.
