I mean; if you devide the number of vertices by the area per aparc-parcellation, some parcellations have relatively more vertices per mm^2 as others. If you now would compute the average thickness in for example the lobe-parcellation, the thicknesses of some areas (the parcellations with relatively more vertices per mm^2) get a higher weight in the overal average. Is that true?
On Tue, May 28, 2013 at 8:58 PM, Douglas N Greve <gr...@nmr.mgh.harvard.edu>wrote: > what do you mean? That the vertices are not uniform? mri_segstats just > computes the mean over the parcellation without reference to non-uniformity. > doug > > > > On 05/28/2013 02:15 PM, Martijn Steenwijk wrote: > >> Sorry, indeed, my reply was too quick. Seems to work, the results are >> similar to mri_anatomical_stats. >> >> I'm not sure whether this is relevant; but the sampling seems to be not >> equally dense in the different regions. Does mri_segstats somehow cope with >> this? >> >> Best, >> Martijn >> >> On Tue, May 28, 2013 at 8:03 PM, Martijn Steenwijk < >> martijnsteenw...@gmail.com >> <mailto:martijnsteenwijk@**gmail.com<martijnsteenw...@gmail.com>>> >> wrote: >> >> Thanks Doug for your quick reply. But mri_segstats computes the >> average value inside the cortical region in the volume, right? >> That's not wat I want to have, I want to know the average value of >> the data in the volume on the wm/gm surface (i sampled with >> projfrac = 0). >> >> Any thoughts? >> >> >> >> On Tue, May 28, 2013 at 7:46 PM, Douglas N Greve >> <gr...@nmr.mgh.harvard.edu >> <mailto:gr...@nmr.mgh.harvard.**edu<gr...@nmr.mgh.harvard.edu>>> >> wrote: >> >> >> I would use mri_segstats and specify the --annot option >> doug >> >> >> On 05/28/2013 01:28 PM, Martijn Steenwijk wrote: >> > Dear all, >> > >> > I've created a custom '.mgh' file containing values on the >> cortical >> > surface using mri_vol2surf. I would like to compute some >> statistics on >> > this surface in the aparc-areas computed by freesurfer. Can >> I then >> > just use mri_anatomical_stats with option -t specifying the >> custom >> > mgh file as 'thickness' input? Or does mri_anatomical_stats >> something >> > more complex than just averaging the values inside each region? >> > >> > Best, >> > Martijn >> > >> > >> > ______________________________**_________________ >> > Freesurfer mailing list >> > Freesurfer@nmr.mgh.harvard.edu >> >> <mailto:freesur...@nmr.mgh.**harvard.edu<Freesurfer@nmr.mgh.harvard.edu> >> > >> >> > https://mail.nmr.mgh.harvard.**edu/mailman/listinfo/** >> freesurfer <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer> >> >> -- >> Douglas N. Greve, Ph.D. >> MGH-NMR Center >> gr...@nmr.mgh.harvard.edu >> <mailto:gr...@nmr.mgh.harvard.**edu<gr...@nmr.mgh.harvard.edu> >> > >> Phone Number: 617-724-2358 <tel:617-724-2358> >> Fax: 617-726-7422 <tel:617-726-7422> >> >> Bugs: >> surfer.nmr.mgh.harvard.edu/**fswiki/BugReporting<http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> >> >> <http://surfer.nmr.mgh.**harvard.edu/fswiki/**BugReporting<http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> >> > >> FileDrop: >> https://gate.nmr.mgh.harvard.**edu/filedrop2<https://gate.nmr.mgh.harvard.edu/filedrop2> >> >> www.nmr.mgh.harvard.edu/**facility/filedrop/index.html<http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> >> >> <http://www.nmr.mgh.harvard.**edu/facility/filedrop/index.**html<http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> >> > >> Outgoing: >> ftp://surfer.nmr.mgh.harvard.**edu/transfer/outgoing/flat/** >> greve/ <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/> >> >> ______________________________**_________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> >> <mailto:freesur...@nmr.mgh.**harvard.edu<Freesurfer@nmr.mgh.harvard.edu> >> > >> >> >> https://mail.nmr.mgh.harvard.**edu/mailman/listinfo/**freesurfer<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<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. >> >> >> >> > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > gr...@nmr.mgh.harvard.edu > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > Bugs: > surfer.nmr.mgh.harvard.edu/**fswiki/BugReporting<http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> > FileDrop: > https://gate.nmr.mgh.harvard.**edu/filedrop2<https://gate.nmr.mgh.harvard.edu/filedrop2> > www.nmr.mgh.harvard.edu/**facility/filedrop/index.html<http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> > Outgoing: ftp://surfer.nmr.mgh.harvard.**edu/transfer/outgoing/flat/** > greve/ <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/> > >
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