Le 30 sept. 2016 9:14 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edu> a écrit :

There is no such long process for PET. The idea is that you process the
MRI in a longitudinal way, then sample the PET data onto the surface of
the closest MRI time point. Then proceed in a way similar to the
thickness analysis


On 09/29/2016 11:08 AM, Matthieu Vanhoutte wrote:
> 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 <mailto: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 <mailto: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 <mailto: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 !
>     >>
>     >> Best regards,
>     >> Matthieu
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>     >>
>     >
>     >
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Douglas N. Greve, Ph.D.
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