Yes, create the new base with 4 timepoints. And rerun the long for each timepoint.
Yujing
From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Eszter Boros Sent: Friday, January 17, 2025 1:00 PM To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] longitudinal analyses, more than 2 timepoints
External Email - Use Caution I apologize! I think I have just realized that I can create one base based on 4 time points, right?
recon-all -base <templateid> -tp <tp1id> -tp <tp2id> -tp <tp3id> -tp <tp4id> -all
Thank you!
Eszter Boros <boros.eszter0226@gmail.commailto:boros.eszter0226@gmail.com> ezt írta (időpont: 2025. jan. 17., P, 12:55): Thank you for the quick response! I appreciate it. I am not sure what you mean by rerun specifically. Should I rerun separate analyses for 0-6 months, 0-1year, and 0-1.5 years? Or can I analyze all of them in the same model? I do not think I should rerun 0-6months if that is already analyzed, right? Thank you!
Huang, Yujing <YHUANG43@mgh.harvard.edumailto:YHUANG43@mgh.harvard.edu> ezt írta (időpont: 2025. jan. 15., Sze, 16:20): Here is the tutorial for longitudinal processing - MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be https://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalProcessinghttps://secure-web.cisco.com/15H1lCCgBPzjRd89RtWHk9KzzXEM40qS4p5I4M8lLImOuILgk9B2URL3DUZcCGz6YEq5oacf5Nj2RpX0eQkDbqxV4PjEohumGH0gd3YamnnV5d-nLHWPquKo9tU8Uo7kq_umH14-6v9qKUmsJelShkrsI4WlFL8vRp5PjRNlcPS8ZOvYdesO-AqZgMyJmEtm_QOWDyJxZJCLz8DDdINaGy3rGaTjQTu5cknKbGlhOrxDO_75AymtC3xHgaloIN6C2cwaMu7qxR40P7dYtSmWlD42vFTV5u2mXCYBaxPmwjh-GpJuj8XLSASmlPcTOVm3FCDrZ7QuE6ou82H_-KwR6OA/https%3A%2F%2Fsurfer.nmr.mgh.harvard.edu%2Ffswiki%2FLongitudinalProcessing
The 'base' and 'long' steps of the longitudinal processing should be re-run after adding new timepoints.
Yujing
From: freesurfer-bounces@nmr.mgh.harvard.edumailto:freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edumailto:freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Eszter Boros Sent: Wednesday, January 15, 2025 1:52 PM To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu> Subject: [Freesurfer] longitudinal analyses, more than 2 timepoints
External Email - Use Caution Dear FreeSurfer Team,
We are analyzing some longitudinal data (baseline [0], 6 months, 1 year, 1.5 years) using FreeSurfer 7.4.1. We already analyzed two timepoints (basline[0] and 6 months) but now we are trying to look at 4 timepoints in total.
I was wondering what the best way would be to do this. For the longitudinal processing, should we create 3 bases/within-subject templates between 0-6 months (this is already done), 0-1year, 0-1.5years), or between 0-6months, 6months-1year, 1year-1.5years. Or both?
Also, is it okay to correct/edit only the bases?
After the longitudinal processing, can we create a Longitudinal Table and apply the two-stage model (LongitudinalTwoStageModel) method? Or because of the 4 time points, we need to apply something else.
Thank you for your help in advance!
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