From hanbyul.h.cho@gmail.com Sun Oct  2 19:47:49 2016
From: Hanbyul Cho <hanbyul.h.cho@gmail.com>
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Gaussian curvature or Mean curvature
Date: Sun, 02 Oct 2016 17:46:40 -0600
Message-ID:
 <CAEtXkpCP1yGRr0_1v-FH_U4mKx9z_Pb_WD2YD-gdiw+NFgTdQQ@mail.gmail.com>
In-Reply-To: <alpine.LRH.2.20.1609162224180.6890@door.nmr.mgh.harvard.edu>
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Dear FreeSurfer Team,

I apologize for the repetitive questions.

I made 2 labels which included bilateral paracentral lobule and sulcus
regions.
Then I extract the values:
   - MeanCurv
     After mris_anatomical_stats processing, I extracted the MeanCurv by
the command,
  'aparcstats2table --hemi ?h --parc <label> --meas meancurv --subjects
<subjects list> --tablefile <output.txt>'

   - ?h.Curv
      After mris_anatomical_stats processing with the option '-t lh.curv',
I extracted the curvature value by the command,
  'aparcstats2table --hemi ?h --parc <label> --meas thickness--subjects
<subjects list> --tablefile <output.txt>'

  - H <mean> +- <std>,   H Mean Rectified Surface Integral
    The Mean curvature values were compute by the command,
    'mris_curvature_Stats -l <label> -g -n -m -f white -o <output.txt>
<subject> ?h'

I analyzed the each value. The ?h.Curv mean (within the label) has opposite
relationship with Z value compared to MeanCurv, while similar relationship
with Z value compared to H <mean>.

I heard that the MeanCurv is the integral of the rectified mean curvature
of white matter surface (1/r mm), and ?h.curv is the mean curvature of the
white matter surface with a Gaussian smoothing kernel applied.
It looks that the MeanCurv and H Mean Rectified Surface Integral has only
positive values, while the H <mean> and ?h.curv has positive or negative
value.

I wonder whether MeanCurv and ?h.curv has the difference meaning or
difference formula.
And I would like to know the meaning of the ?h.curv negative value.
Is H <mean> ( by mris_curvature_Stats ) compute from ?h.curv ?


Thank you.

Han.



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