Dear Bruce Fischl,
Thank you for your help.
Best Regards,
Han Byul Cho
On Fri, Sep 16, 2016 at 8:27 PM, Bruce Fischl fischl@nmr.mgh.harvard.edu wrote:
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 <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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