Hi Sarah
what ROIs do you mean? And did you correct for the reduced surface area
in fsaverage w.r.t. the individual surfaces? If not, it's not surprising
that fsaverage ROIs have less surface area. It is an average surface and
less folded than any individual.
cheers
Bruce
On Mon, 7 Oct 2013, Jensen, Sarah wrote:
Hi Freesurfer users,
I am analysing some volumetric data and have noticed that the volumes I
extract from my participants are very different from the volumes of my
templates in fsaverage space. I for instance have two ROIs that stand out as
big (about 6-8 times larger that the other ROIS) in fsaverage space, but
come out as almost indistinguishable from the other ROIs in my data. When I
sort my ROIs according to size there seems to be no consistency between the
size in fsaverage space and my subjects, and the correlation between the
volume in fsaverage and my subjects is about .05 - 0.1.
I am new to freesurfer, and would intuitively expect greater consistency
between the ROIs in fsaverage and the subjects. Has anyone else had similar
experiences, and is this lack of consistency between volumes in fsaverage
space and participant data perfectly normal?
Thanks,
Sarah
_______________________________________________
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.
