Thanks Martin, I will try it out. K
From: Martin Reuter [mailto:mreu...@nmr.mgh.harvard.edu] Sent: Friday, March 14, 2014 9:31 AM To: Govindarajan, Koushik Athreya; freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] adding time points to longitudinal base template Hi Koushik, there is a way to add time points without recreating the base: recon-all -long <tpNsubjid> <longbasesubjid> -addtp -all This is what the recon-all help says about that: "If a new timepoint needs to be added to a longitudinal run where a base subject has already been created (from prior timepoints), then the -addtp command can be added to the -long command in order to 'fix-up' the longitudinal stream to accept the new timepoint. Note that the base subject is *not* recomputed using the new timepoint. This potentially introduces a bias, and it is recommended to NOT add a time point this way! Instead recreate the base from all time points and run all longitudinals again." So it's up to you. But given you already have 5 time points in your base and add only 1, you may be fine. The base should be pretty stable with 5 and if the 6th is not too different, it should not matter much. I don't think anyone has ever done a thorough analysis about adding time points. Best, Martin On 03/11/2014 10:08 AM, Govindarajan, Koushik Athreya wrote: Dear FS experts, I have a serial study in which I have run cross-sectional and longitudinal analysis on 5 time points. Now, I want to add a 6th time point to my dataset. Do I have to rerun my base template creation step from scratch or is there a way to just add further time points to an existing template? Thanks Koushik _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu<mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer<https://urldefense.proofpoint.com/v1/url?u=https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer&k=yYSsEqip9%2FcIjLHUhVwIqA%3D%3D%0A&r=4ebx%2BU4XzNnu4XA8t53Lt0n%2FTCuxbfN4Z1deUmAFsLg%3D%0A&m=DVyhlZm48BQ7pEr20iqqosHWjgQ31wzMoC9FDk9YpEo%3D%0A&s=48648d97d14c3c96469c77ba99084506ab3a9eb1d6046d5937b5a35a037bce5d> -- Martin Reuter, Ph.D. Assistant in Neuroscience - Massachusetts General Hospital Instructor in Neurology - Harvard Medical School MGH / HMS / MIT A.A.Martinos Center for Biomedical Imaging 149 Thirteenth Street, Suite 2301 Charlestown, MA 02129 Phone: +1-617-724-5652 Email: mreu...@nmr.mgh.harvard.edu<mailto:mreu...@nmr.mgh.harvard.edu> reu...@mit.edu<mailto:reu...@mit.edu> Web : http://reuter.mit.edu<https://urldefense.proofpoint.com/v1/url?u=http://reuter.mit.edu&k=yYSsEqip9%2FcIjLHUhVwIqA%3D%3D%0A&r=4ebx%2BU4XzNnu4XA8t53Lt0n%2FTCuxbfN4Z1deUmAFsLg%3D%0A&m=DVyhlZm48BQ7pEr20iqqosHWjgQ31wzMoC9FDk9YpEo%3D%0A&s=30e97dd7834b287056c1385ccff33fcd591a190ee3917c4441cadea4d971b918> 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.
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