External Email - Use Caution 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." > <dgr...@mgh.harvard.edu> wrote: > > > I'll leave that up to Bruce and Rudolph > > On 12/19/2018 05:37 PM, Martin Juneja wrote: > > > > External Email - Use Caution > > > > 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. > > <dgr...@mgh.harvard.edu <mailto:dgr...@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 > > > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Dr. Tim Schäfer Postdoc Computational Neuroimaging Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy University Hospital Frankfurt, Goethe University Frankfurt am Main, Germany _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
