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
