On 06/10/2013 02:18 AM, Andreas Berger wrote: > Hi, > > basically, i would like to use the area measure for group analysis, but i'm > not sure whether that's ok to do. my questions would be: > > is it suitable for group analysis? yes > > what should i cite if i do? We don't have a citation specifically for it. It is used by this paper, but it does not describe it in detail. Greve, D. N., Van der Haegen, L., Cai, Q., Stufflebeam, S., Sabuncu, M. R., Fischl, B., & Brysbaert, M. (2013). A Surface-based Analysis of Language Lateralization and Cortical Asymmetry. /Journal of cognitive neuroscience/, (Early Access), 1-16. > > is surface area represented vertex-wise, with a vertex' adjacent face's area > added and divided by 3? That is how the ?h.area file is created. > > What happens when resampling to the standard mesh: >> The method assures that total area (or volume) is preserved when mapping > between subjects > was that referring to the method described by Winkler or the default > FreeSurfer way of doing it? No, his way is more elaborate and probably much better but harder to implement and slower. The currently implemented version effectively preserves area over any given patch when mapping to fsaverage. I don't know what the size of the patch is but is probably on the order of 5mm (probably smaller). doug > > > andreas > > > On Wednesday, June 05, 2013 23:22:46 Douglas N Greve wrote: >> Hi Andreas, it is not the same method but somewhat related. The method >> assures that total area (or volume) is preserved when mapping between >> subjects. How much detail do you need? >> doug >> >> On 06/04/2013 05:21 AM, Andreas Berger wrote: >>> Hello FreeSurfers, >>> >>> after reading this [1] paper about measuring surface area, i realized i >>> don't know what the default way of measuring surface area is in >>> FreeSurfer. Is it similar to what's described in the paper? Could you >>> point me to the right documentation or publication? >>> Forgive me if i've overlooked it, i found something for thickness, but >>> not for area. To clarify, i don't mean parcellation-based areas, i mean >>> the measure that i find in /surf/hemi.area. >>> >>> >>> thanks, >>> regards, >>> Andreas >>> >>> >>> [1] Measuring and comparing brain cortical surface area and other areal >>> quantities. Winkler AM, Sabuncu MR, Yeo BT, Fischl B, Greve DN, Kochunov >>> P, Nichols TE, Blangero J, Glahn DC (2012). Neuroimage 61(4):1428-43 >>> _______________________________________________ >>> 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 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.
