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K and H are the Gaussian Curvature and the Mean Curvature. Both can be computed based on the 2 principal curvatures k1 and k2 of a surface.
K and H are not identical to the folding index, though they are related to it via k1 and k2. k1 and k2 are also known as k_max and k_min, which you may know from the definition of the folding index.
Tim
On December 19, 2018 at 11:42 PM "Greve, Douglas N.,Ph.D." DGREVE@mgh.harvard.edu wrote:
I'll leave that up to Bruce and Rudolph
On 12/19/2018 05:37 PM, Martin Juneja wrote:
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Thanks Dr. Greve. That works, but both white.K and white.H are giving me very different output values.
For example, for first few subjects I get: -0.00237 -0.00450 -0.00204 0.00113 -0.00228 -0.00958 -0.00314 0.00180 -0.00452 if I use white.K -0.05809 -0.05799 -0.06457 -0.07254 -0.07208 -0.05023 -0.06044 -0.09338 -0.09178 if I use white.H
Can you please tell me the difference between white.K and white.H conceptually and mathematically?
On Wed, Dec 19, 2018 at 2:27 PM Greve, Douglas N.,Ph.D. <DGREVE@mgh.harvard.edu mailto:DGREVE@mgh.harvard.edu> wrote:
something like --meas white.K or white.H On 12/19/2018 04:23 PM, Martin Juneja wrote: > > External Email - Use Caution > > Hi, > > Just like volume, I have "Folding Index" measures saved in > lh/rh.aparc.stats files for each subject. > > If I am using mris_preproc *--meas volume* --out CV/lh.CV.mgh command > to concat cortical volume files from all subjects, then how can I use > this command for "folding index" output file? > > Any help will be really appreciated. > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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-- Dr. Tim Schäfer Postdoc Computational Neuroimaging Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy University Hospital Frankfurt, Goethe University Frankfurt am Main, Germany