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 !
>>
>> Best regards,
>> Matthieu
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