How did you get the 15 mm^2 regions? And how did you
know that they are
15mm^2? There are some complications with using the
raw vertex areas on
fsaverage. The total surface area of the average
will be wrong
(inevitable with the way that fsaverage is
computed). However, there is
a correction, and our tools take this into account.
doug
jorge luis wrote:
Hello all
I have made deep changes in 9 regions of a left
hemisfere of a subject surface after maped it onto
the fsaverage subject sphere. The changes were made
to
have areas close to 15 mm^2. I computed the areas
by
add the areas of the faces inside the regions
(computed using the vertexes spherical
coordinates).
The freesurfer sphere mapping is based in minimal
metric distortion, so, why I got the following
differences?:
Region Computed areas (mm^2) Computed areas
(mm^2)
uing mri_surfcluster as explained before
with the fsaverage sphere
1 27.56 15.0522
2 21.78 15.0946
3 21.41 15.1087
4 20.77 15.1501
5 19.28 15.1797
6 16.60 15.1918
7 15.99 15.2781
8 14.31 15.3373
9 13.89 15.0541
In both cases the same surface vertexes were found
to
be inside the regions
Another thing:
Should I use the sig.mgh file resulted from the
mri_glm estimation as the input to the
mri_surfcluster
function in MonteCarlo simulations? (plus the .csd
file of course).
In advance thank you a lot
Jorge
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