Hi Gabor
whether it "matters" is really a question of what you want to do with the data. The chiasm is pretty small and won't change much
cheers Bruce On Fri, 7 Jul 2017, Gabor Perlaki wrote:
Dear all,
Freesurfer 6 creates pial and white matter surfaces around the optic chiasm in some of my subjects (see the attached pictures). When I check the aparc.DKTatlas+aseg.mgz, sometimes these places are segmented as optic chiasm or nothing (which seems to be good), but sometimes this region is segmented as white matter or medialorbitofrontal cortex. Could somebody please confirm that these surface inacuracies don't matter as long as the area is not segmented as a cortical region or white matter in the aparc.DKTatlas+aseg.mgz file, and I should correct it if missegmented as a cortical region or white matter? I suspect that I should correct the wm.mgz. However, all of the brainmask, aseg and wm corrections are done on my subjects and I'd like to correct this new error without loosing those corrections. How should I correct this new wm inaccuracy without loosing my earlier aseg corrections?
Best Regards, Gabor
2017-06-30 14:11 GMT+02:00 Gabor Perlaki petzinger.gabor@gmail.com: Dear all,
I use Freesurfer 6. In some of my subjects the surfaces (both pial and white) intruding into the optic chiasm. However, when I check the aparc.DKTatlas+aseg.mgz it seems that although the surfaces are wrong, the region is segmented as optic chiasm. Can I ignore this type of surface inaccuracies similarly to surface inacurracies around the amygdala and hippocampus?
Best Regards, Gabor
-- Gabor Perlaki research associate Diagnostic Center of Pécs H-7623 Pécs, Rét str. 2. Tel.: 0036-30-2084367 E-mail: petzinger.gabor@gmail.com