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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.edu ezt írta (időpont: 2025. jan. 15., Sze, 16:20):
Here is the tutorial for longitudinal processing - https://secure-web.cisco.com/1i3PDR08oGR9V8EyN5vNTRW6mNleyQB69JGWx-o-GpV4uK3...
The 'base' and 'long' steps of the longitudinal processing should be re-run after adding new timepoints.
Yujing
*From:* freesurfer-bounces@nmr.mgh.harvard.edu < 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.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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