Hi Chistina, the aseg.stats has all that information. You can create a table from all subjects with asegstats2table . It will also contain the ICV (probably called eTIV or something like that). And you can use it in your model, which is probably the best approach.
Cheers, Martin On 01/24/2016 02:58 PM, Christina van den Brink wrote: > Hi Bruce (and the freesurfer community), > > Thanks for your reply! Would it be possible to get more details on the > process of how I might go about correcting these volumes myself? It would be > ideal if I had the volumes prior to entering it into my statistical model > (and thus I’d prefer not to use head size as a regressor if possible). When > you say ‘dividing it out’, is this simply taking the regional volumes and > dividing it by eTIV to obtain a proportion? What are the downsides to > approaching it in this manner vs. using it as a regressor? > > Many thanks, > > Christina > > > >> On Jan 11, 2016, at 12:46 PM, Bruce Fischl <fis...@nmr.mgh.harvard.edu> >> wrote: >> >> Hi Christina >> >> we don't correct any volumes for head size - we just provide the information >> for you to do it yourself. I think including it as a regressor is more >> common than dividing it out, but perhaps others can comment. >> >> cheers >> Bruce >> On Mon, 11 Jan 2016, Christina van den Brink wrote: >> >>> Hello, >>> I have a question regarding volume-correction for the morphometry stats >>> obtained via recon-all. I’ve noted that eTIV is derived using the atlas >>> scaling factor in order to account for head size. I’m wondering whether the >>> other volumes given, e.g. TotalGray or lhCorticalWhiteMatter, have also been >>> corrected for head size? If not, is there a recommended method in which to >>> do so so that regional volumes can be compared between participants? >>> Many thanks for your help! >>> Best, >>> Christina >> _______________________________________________ >> 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 > > -- Martin Reuter, PhD Assistant Professor of Radiology, Harvard Medical School Assistant Professor of Neurology, Harvard Medical School A.A.Martinos Center for Biomedical Imaging Massachusetts General Hospital Research Affiliate, CSAIL, MIT Phone: +1-617-724-5652 Web : http://reuter.mit.edu _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
