this was : Van Essen, D.C., Drury, H.A., 1997. Structural and functional analyses of human cerebral cortex using a surface-based atlas. J Neurosci 17, 7079–102. Cheers
— Christophe Destrieux, Unité « Imagerie et Cerveau » UMRS INSERM U930, Université François Rabelais de Tours Service de Neurochirurgie Laboratoire d’Anatomie, Faculté de Médecine, 10 Bd Tonnellé - 37032 Tours - France Bureau: +33 2 47 36 61 36 | Fax +33 2 47 36 62 07 | Mel Bureau: christophe.destri...@univ-tours.fr Web : http://www.u930.tours.inserm.fr/ <http://www.u930.tours.inserm.fr/> > Le 20 févr. 2016 à 19:22, Bruce Fischl <fis...@nmr.mgh.harvard.edu> a écrit : > > Hi Marta > > A 2D surface (like the cortical white or pial models) has two principal > curvatures at each point - one in the direction of maximum curvature and one > in the direction of minimum curvature - typically denoted k1 and k2. The mean > curvature is the average of these H=(k1+k2)/2 and the Gaussian curvature is > the product of them K=(k1 * k2). So, MeanCurv is the integral of the > absolute value of H and GausCurv is the integral of the absolute value of K. > FoldInd and CurvInd are two indices proposed by David Van Essen in a paper > from years ago that we also compute. Sorry, I don't have the right reference > handy, perhaps someone else on the list does? > > cheers > Bruce > > > On Tue, 16 Feb 2016, Karas, Marta wrote: > >> H! >> I am working with data which is an output from the FreeSurfer processing. >> I would like to kindly ask you to refer me to materials / precise >> "mathematical" definitions that could help to understand what are the >> following parameters: >> * MeanCurv - Integrated Rectified Mean Curvature, >> * GausCurv - Integrated Rectified Gaussian Curvature, >> * FoldInd - Folding Index, >> * CurvInd - Intrinsic Curvature Index. >> (I have been trying to google but not been successful, unfortunately.) >> Kind regards, >> Marta Karas, M.S. >> Research Assistant, Department of Biostatistics >> Richard M. Fairbanks School of Public Health and School of Medicine >> Indiana University >> tel: 317-665-4551 >> email: mka...@iu.edu > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > The information in this e-mail is intended only for the person to whom it is > addressed. If you believe this e-mail was sent to you in error and the e-mail > contains patient information, please contact the Partners Compliance HelpLine > at > http://www.partners.org/complianceline . If the e-mail was sent to you in > error > but does not contain patient information, please contact the sender and > properly > dispose of the e-mail.
_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
