Hi Han
the ?h.curv files are the mean curvature of the white matter surface with a
Gaussian smoothing kernel applied to it over space. The ?h.curv.pial is the
same thing for the pial surface. The ?h.inflated.H is the (unsmoothed)
curvature of the inflated surface, and the ?h.inflated.K is the same but
Gaussian curvature.
cheers
Bruce
On Fri,
16 Sep 2016, Hanbyul Cho wrote:
Dear Bruce Fischl,
Thank you for your explanation.
I think I could not yet fully understand the 'curv' files.
After processed this command,
recon-all -s <subject> -i <input file> -all
the output files were follow as,
surf/?h.curv
surf/?h.curv.pial
surf/?h.inflated.H
surf/?h.inflated.K
I wonder all these output files contained 'spatially smoothed mean
curvature'.
Could I know that the meaning of 'spatially smoothed' ?
Are these output files difference from the output of 'mris_curvature'
command?
I saw the values that
stats/?h.aparc.stats and
stats/?h.aparc.a2009s.stats
contained the 'integrated rectified Mean curvature' and 'integrated
rectified Gaussian curvature'.
I wonder these values were if the average curvature of vertices in each
region, or other computed values using different atlas parcellation level.
I appreciate your help.
Best Wishes,
Han.
On Fri, Sep 16, 2016 at 4:37 PM, Bruce Fischl <fis...@nmr.mgh.harvard.edu>
wrote:
Hi Han
the files ?h.curv contain the spatially smoothed mean curvature.
You can compute the mean or Gaussian (or principal) curvatures
of any surface using the mris_curvature command.
cheers
Bruce
On Fri, 16 Sep 2016, Hanbyul Cho wrote:
Dear FreeSurfer Team,
I heard that FreeSurfer could calculate the Gaussian
curvature and Mean
curvature by vertex level.
Do the computed curvature values be saved as the
subject/surf/lh.curv or
rh.curv files?
When I prepared the generated mass-univariate data,
I used the mris_preproc
with [--meas curv] option, not [--meas thickness].
mris_preproc --qdec-long qdec.table.dat --target
study_average --hemi lh
--meas curv--out lh.curv.mgh
I wonder this option is right usage to analyze the
cortical curvature. And I
wonder the 'curv' is what specific value is meaning.
If I want to designate the specific curvature
values(Gaussian or Mean
curvature ) to analyze by vertex level, how can I
use the [--meas] option?
Thank you,
Best wishes,
Han.
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