Hi William, either way is fine, as long as you don't mix results from cross and long processing in your analysis. Since all images need to go through the cross sectional stream anyway, I think actually (2) will be less processing (and potentially less QC and editing).
Best, Martin On 06/10/2016 09:12 AM, William Baare wrote: > Hi > > I have two groups I want to compare, in total 172 scans > Of these 78 got a a follow up. Groups are approximately evenly distributed. > > I want to do first a cross sectional comparison and subsequently a > longitudinal analysis for the 78 subjects only. > > My question is: > (1) Is it is valid to analyse all data using the longitudinal processing > stream ( e.g. recon-all -all, recon-all -base, recon-all -long), even though > I do separate cross sectional and longitudinal analyses? Or (2) should I > analyse first the 175 using the cross sectional stream and then separately > analyse the 78 with a follow up scan with the longitudinal stream? > > > Of course I would prefer option 1 as that would reduce potential > editing/adjusting > > many thanks in advance > William > > > > > > _______________________________________________ > 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 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.
