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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