Hi Remmelt
folding patterns are not symmetric across the hemispheres, so the cortical
parcellation will change if you flip things left/right, which is
appropriate. I would be surprised if you see much change in the thickness
though.
cheers
Bruce
On Fri, 15 Jun 2012, Schur, Remmelt R. wrote:
Dear Freesurfers,
Grey matter volumes of the same structure seem to be measured differently
depending on if FreeSurfer establishes it as in the left or in the right
hemisphere. For example, if I take a look at the caudal anterior cingulate
in the right hemisphere and I flip the image (creating a mirror image of
the same hemisphere, which will then be treated by FreeSurfer as a left
hemisphere), the same structure has a totally different grey matter volume
(see attachment, on the right the original and on the left the flipped
version). Does anybody know what's the logic behind this and what's the
best way to avoid FreeSurfer creating asymmetry between left and right
hemisphere (maybe averaging flipped and non-flipped data?)
Thanks!
Kind regards,
Remmelt Schür
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