It’s because people have found empirically that surface area and volume are correlated with TIV, but thickness is not cheers Bruce > On Nov 26, 2017, at 9:54 PM, 郑凤莲 <13181786...@163.com> wrote: > > Hi Bruce, > > Thanks for your help. But I have a doubt in why we should do in this way? > Are there any principles or mechanisms in Qdec? > > Sincerely, > Zheng > > > > > > > At 2017-11-27 10:47:49, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote: > Yes > >> On Nov 26, 2017, at 9:40 PM, 郑凤莲 <13181786...@163.com> wrote: >> >> Hi Bruce, >> That is, I should set eTIV at Nuisance Factors for volume and surface >> area, not for thickness in qdec, is it right? >> >> <qdec.PNG> >> >> >> >> At 2017-11-27 10:22:05, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote: >> >you should correct for eTIV for volume (but not for thickness) >> >On Mon, 27 >> >Nov 2017, 郑凤莲 wrote: >> > >> >> Hi Greve, >> >> Only for age and surface area, no thickness or volume, is it right? >> >> >> >> Thanks! >> >> Zheng >> >> >> >> >> >> >> >> >> >> At 2017-11-26 03:04:26, "Douglas Greve" <gr...@nmr.mgh.harvard.edu> wrote: >> >> >> >> Yes, for age and surface area. >> >> >> >> >> >> On 11/23/17 2:05 AM, 郑凤莲 wrote: >> >> Hi professors, >> >> >> >> I am using Qdec in Freesurfer. I want to study the relationships >> >> between age and >> >> cortical thickness, age and cortical volume, age and surface area. Is it >> >> necessary to >> >> corrected by eTIV for volume and surface area in Qdec? >> >> I am looking forward to your reply. >> >> >> >> Thanks, >> >> Zheng >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> _______________________________________________ >> >> 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 > > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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