Hi Kevin, It shouldn't. I created the labels by the doing the following: 1 - manully raced an ROI using another program (Analyze) in volume space and saved the ROI as a greyscale mask in analyze format 2 - used mri_convert to convert both the original T1 and ROI to COR format. 3 - Generated the surface of the T1 and loaded the ROI as an overlay in tksurfer 4 - Filled the overlay using custom fill and saved it as a label.
I'm not sure how I would check the image dimensions of the label, but I assume step 2 would have put it into 1mm3, which would then convert to 1mm2 when projected onto the surface (?).
-----Original Message----- From: Kevin Teich [mailto:kteich@nmr.mgh.harvard.edu] Sent: Thu 8/11/2005 5:18 AM To: Fornito, Alexander Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Editing labels
I've been trying to edit some labels in tkmedit and have noticed that if I save a label in tkmedit and then project it back onto the surface in tksurfer, it appears fragmented (ie., speckled). This happens even if I save a label that was created in tksurfer in tkmedit without even editing it (ie., create label in tksurfer, load it in tkmedit, save it in tkmedit (without editing), and then load it back in tksurfer). I don't understand why this should happen, particulalry in the latter case, as the label should remain unchanged. Can anyone explain why this might happen? Thanks, Alex
Does your data have a voxel resolution different than 1mm squared?