Yes that makes perfect sense. Thanks very much.
> On 17 Jan 2015, at 7:01, Douglas N Greve <gr...@nmr.mgh.harvard.edu> wrote: > > > I don't have a core paper on the area mapping (which is more complicated > than mapping thickness). Anderson Winkler wrote a paper on the subject, > but we are not using his method. Our method is relatively simple. Each > vertex in fsaverage is mapped back to the individual to find the closest > vertex. The thickness or area at this vertex is then assigned to the > vertex in fsaverage. There will be some fsaverage vertices that map to > the same vertex in the individual. For thickness, this is not a problem. > For area or volume, we divide the value by the number of fsaverage > vertices that share the individual vertex to preserve the total. This > may leave some vertices in the individual that were never a closest > vertex. We loop through these vertices and do a reverse map back to > fsaverage to find the closest vertex. These fsaverage vertices will then > have multiple vertices from the individual. For thickness, we compute > the mean of the source vertices. For area or volume we compute the sum > (must preserve the total). > > make sense? > doug > > > >> On 01/16/2015 12:00 AM, Bronwyn Overs wrote: >> I meant that as well as the mapping of the area to the average space. >> >> Kind regards, >> >> Bronwyn Overs >> Research Assistant >> >> Neuroscience Research Australia >> >> Neuroscience Research Australia >> Margarete Ainsworth Building >> Barker Street Randwick Sydney NSW 2031 Australia >> *M* 0411 308 769 *T* +61 2 9399 1883 *F* +61 2 9399 1265 >> >> neura.edu.au <http://neura.edu.au> >> >> Follow @neuraustralia on twitter >> <https://twitter.com/neuraustralia>Follow NeuRA on facebook >> <https://www.facebook.com/NeuroscienceResearchAustralia>Subscribe to >> the NeuRA Magazine <http://www.neura.edu.au/help-research/subscribe> >> >>> On 16/01/2015 3:58 pm, Douglas Greve wrote: >>> >>> The computation is pretty simple, it is just the average of the area >>> of the surrounding triangle. Is that what you mean or do you mean the >>> mapping of said area to the average space? >>> doug >>> >>> >>> >>>> On 1/15/15 11:37 PM, Bronwyn Overs wrote: >>>> Dear Mailing List, >>>> >>>> I would like to understand how freesurfer calculates the surface >>>> area at each voxel to be used in the GLM procedure. Is there a key >>>> methods paper that describes this process, and can this method be >>>> explained in simple terms? >>>> -- >>>> >>>> Kind regards, >>>> >>>> Bronwyn Overs >>>> Research Assistant >>>> >>>> Neuroscience Research Australia >>>> >>>> Neuroscience Research Australia >>>> Margarete Ainsworth Building >>>> Barker Street Randwick Sydney NSW 2031 Australia >>>> *M* 0411 308 769 *T* +61 2 9399 1883 *F* +61 2 9399 1265 >>>> >>>> neura.edu.au <http://neura.edu.au> >>>> >>>> Follow @neuraustralia on twitter >>>> <https://twitter.com/neuraustralia>Follow NeuRA on facebook >>>> <https://www.facebook.com/NeuroscienceResearchAustralia>Subscribe to >>>> the NeuRA Magazine <http://www.neura.edu.au/help-research/subscribe> >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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 >>> >>> >>> 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 > > -- > 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 > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > > _______________________________________________ > 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
