Regarding Winkler et al.: http://brainder.org/2012/06/02/facewise-brain-cortical-surface-area-scripts-now-available/ On Aug 21, 2012 11:00 PM, "Gregory Kirk" <gk...@wisc.edu> wrote:
> > Hi folks, I wanted to make sure i have everything straight w.r.t. the > surface area measures. > > as i see there are 4 ways implemented ( somewhere ) to do cortical surface > area analysis. > > 1. areal expansion > > 2. Local Gyrification Index > > 3. direct vertex based true surface area glm, Winkler AM et. al > > 4. roi based, i.e. based on the surface areas of the parcellation units in > lh.aparc.a2009s.stats etc. > > > 1. recent pub, Lisa T. Eyler et. al used the areal expansion method. > was this done exactly as would be achived by using the area tab on qdec > and setting up a glm ? > Dale published surface area specifying some details of implementation but > i was not sure > if this was exactly what is implemented in qdec ? > > 2. LGI seems to me this is the ratio of two areas, that of the hull to the > area inscribed by projecting > the border of the hull onto the grey/white surface. In an e-mail Nick said > LGI is a curvature based measure and that > confused me a bit. gyrification is of course related to curvature but it > seems the quantities actually calculated here are ratios of areas, which > gives local info on surface area differences. > > 3. the winkler stuff is i think not publicly available yet at this time ? > > 4. straightforward enough not withstanding ICV corrections, etc. > > any words of clarification before i start trying some analysis on my group > ? > > thank you > > Greg > _______________________________________________ > 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. > >
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