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 <fischl@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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