Dear Freesurfer's experts,
Could you answer me about my last question with no response in the mail below ?
When using cortical thickness in longitudinal analysis with LME, we used lh.thickness or rh.thickness from -long subject directories. These data followed particular processing steps including registrations in order to use them with more precision in longitudinal studies, didn't they ?
My problem is that I would like to perform longitudinal study on PET data images with LME. So I wonder if I just have to resample onto -long cortical subject surface ? Do I need to follow the same steps than cortical thickness from cross-sectional to -long subject directories ? If this is the case, which commands should I use to mimic cortical thickness longitudinal data ?
Many thanks in advance for helping !
Best regards, Matthieu
2016-09-18 23:02 GMT+02:00 Matthieu Vanhoutte matthieuvanhoutte@gmail.com:
Hi Martin,
Thanks for your answer. However, it seems to me that cortical thickness follow a particular process with the recon-all -long process, isn’t it ? Is there any resample onto average time subject then other operation following ?
Best regards, Matthieu
Le 18 sept. 2016 à 16:26, Martin Reuter mreuter@nmr.mgh.harvard.edu a
écrit :
Hi Matthieu,
I never used PET data, but once you manage to resample you pet data onto
the surface, you will have a file similar to the thickness file for each subjects. Instead of thickness it holds you PET information. From that point on everything should be identical to the thickness analysis.
So this is really more a question how to get your PET data sampled onto
the surface. If no one else replies, write that into the subject line and repost.
Best, Martin
On Sep 17, 2016, at 7:37 AM, Matthieu Vanhoutte <
matthieuvanhoutte@gmail.com> wrote:
Dear Freesurfer’s experts,
I would like to use the longitudinal mixed-effects model for surface
PET analysis. Although I could find all the process to follow the longitudinal analysis of cortical thickness, I couldn’t resolve the steps/commands to apply successively to coregistered PET data on T1 MRI.
Could you precise me the process and commands to use for PET
longitudinal analysis ?
Many thanks in advance !
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