Hi Holger
how did you calculate the surface area? And how are you visualizing it? I
wouldn't use the surface area of the average subject for anything other
than visualization as the coordinate system is not linear. You need to
compute the surface area in the individual subject coordinates or take the
jacobians into account.
cheers
Bruce
On Tue, 2 Apr 2013, Klein, Holger
wrote:
Dear Freesurfers,
I averaged 42 subjects with make_average_subject focusing on Heschl's Gyrus and
finally got the image attached (for both
atlases (Desikan = Atlas I, Destrieux = Atlas II).
Gray matter surface calculations for Heschl's gyrus showed the following mean
values (in mm^2):
Atlas I lh = 439 (SD 60), rh = 323 (SD 46)
Atlas II lh = 340 (SD 70), rh = 253 (SD 47)
Heschl's gyrus depicted in the attached image looks considerably larger for
Atlas II, but the surface analysis gives me
smaller values for mean surface calculation (Atlas II < Atlas I)
How can that be explained?
Thanks in advance
[cleardot.gif]
Holger
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