Thanks, Bruce and Matt. bestJingDate: Wed, 8 Feb 2012 11:53:44 -0500 From: [email protected] To: [email protected] CC: [email protected]; [email protected] Subject: Re: [Freesurfer] Question about ?h.sulc and ?h.curv
oops, thanks Matt Bruce On Wed, 8 Feb 2012, Matt Glasser wrote: > I think Bruce meant: > > "the ?h.sulc is the integrated dot > product of the movement vector with the surface normal during inflation." > > Peace, > > Matt. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Bruce Fischl > Sent: Wednesday, February 08, 2012 10:48 AM > To: Jing Ming > Cc: Freesurfer > Subject: Re: [Freesurfer] Question about ?h.sulc and ?h.curv > > They are computed from the ?h.white surface. The ?h.curv is the > spatially smoothed mean curvature, and the ?h.curv is the integrated dot > product of the movement vector with the surface normal during inflation. > Therefore the curv is a local differential measure that will highlight > small scale structure, while the sulc is insensitive to small local > geometry and highlights larger scale structure (e.g. was the point deep > even though it was folded out) > > On > Tue, 7 Feb 2012, Jing Ming wrote: > >> Hi surfers: >> >> I have a two questions. >> >> 1) how does freesurfer calculate ?h.sulc file and ?h.curv. Are they > calculated after gray/white/csf segmentation? Are they calculate based on > gray/white boundary? >> So, difference between ?h.sulc or ?h.curv will directly come from white > matter change, right? >> >> 2) what's the difference between ?h.sulc and ?h.curv? In terms of sulcal > structure, does ?h.sulc indicate sulcal depth and ?h.curv somehow indicate > sulcal width? >> To me, from the display, ?h.sulc seems a smoothed version of ?h.curv. From > some reference, I know .sulc is also called average convexity, so is the > convexity for >> each vertex averaged within a small region or is it averaged through the > whole hemisphere brain surface? >> >> Thanks much for your help! >> >> Best >> Jing >> >> > > > > _______________________________________________ Freesurfer mailing list [email protected] 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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