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It looks like you are transforming it to fsaverage space before
computing the statistics. If this is correct, then that will explain the
differences as that transform will involve some interpolation which will
change the values. But they should be very close.
On 8/25/2023 2:50 AM, 1500787798 wrote:
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Dear FreeSurfer developers,
When I extract the surface area of the brain regions
corresponding to the DK atlas in fsaverage space with the following
command, the corresponding DK atlas brain regions calculated after
summation or averaging, whether using lh.area or lh.area.pial, do not
match the values of the surface areas directly extracted from the
lh.aparc.stats file. I'm curious to know why this is the cause?
mri_surf2surf --srcsubject $subject --sval area.pial --src_type curv \
--trgsubject fsaverage --trgsurfval
$SUBJECTS_DIR/$subject/lh.area.pial.fsaverage.mgh --trg_type curv
--hemi lh
Best,
Jinfeng Hou
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