Hi Bruce, I did that test some time ago (each sequence alone or averaged) but only with one control subject. I then checked the values of different measures and the cortical thickness maps for each situation and they were very similar indeed. I did it only with one subject because the point was to choose one of the MPRAGEs. But now that I need to drag conclusions I wasn't sure if the different sequences would be a major problem and would invalidate the conclusions.
I'll match the number of subjects for each sequence but bearing in mind that I have two different sequences anyway. Thank you for the help! Andreia Quoting Bruce Fischl <fis...@nmr.mgh.harvard.edu>: > p.s. you would be better off if you had the same proportion of > patients and controls with each sequence. Matching the numbers > within one sequence and not the other doesn't really help > > On Thu, 28 Mar 2013, _andre...@sapo.pt wrote: > >> Hello list, >> >> I have a group of subjects (4 patients and 8 controls) in which one >> MPRAGE sequence was used and another group of subjects (2 patients and >> 2 controls) where a diffent MPRAGE was used. Both groups were acquired >> in the same scanner. For each subject I have two anatomical sequences >> and I'm working with the average dataset. My question is can I put >> both groups together for comparision? >> >> I've thought about this and I can't really be sure... I was thinking >> that since for group 2 the number of acquisitions is balanced maybe >> the overall impact of different sequences won't be significative... >> Patients and subjects are age-matched in both groups. >> >> Please, any advice will be greatly appreciated! >> >> Thank you! >> _______________________________________________ >> 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
