Re: [Freesurfer] Longitudinal surface analysis of PET data

Hi Martin, Thank you for clarifications ! 1) What do you mean by "If, for some reason, the pet and MR (cross) are already very close in space" ? 2) How could it be possible to directly register to the long time point ? Since I use a rigid registration, the long time point T1 will not have been

Re: [Freesurfer] Longitudinal surface analysis of PET data

Hi Matthieu, to clarify, you can directly register to the long time point. If, for some reason, the pet and MR (cross) are already very close in space, it may make sense to first register to that, then concatenate that transform with the one from cross to long and then map the PET there.

Re: [Freesurfer] Longitudinal surface analysis of PET data

Thank you ! Best regards, Matthieu 2016-11-14 17:48 GMT+01:00 Douglas N Greve : > Rigid. > > > On 11/14/2016 11:43 AM, Matthieu Vanhoutte wrote: > > Still using rigid-body registration on --long subject directory ? > > > > Or is affine registration in this case

Re: [Freesurfer] Longitudinal surface analysis of PET data

Rigid. On 11/14/2016 11:43 AM, Matthieu Vanhoutte wrote: > Still using rigid-body registration on --long subject directory ? > > Or is affine registration in this case needed ? > > Best regards, > Matthieu > > 2016-11-14 17:12 GMT+01:00 Douglas N Greve

Re: [Freesurfer] Longitudinal surface analysis of PET data

Still using rigid-body registration on --long subject directory ? Or is affine registration in this case needed ? Best regards, Matthieu 2016-11-14 17:12 GMT+01:00 Douglas N Greve : > I would just register the pet to the closest (in time) anatomical > > > On

Re: [Freesurfer] Longitudinal surface analysis of PET data

I would just register the pet to the closest (in time) anatomical On 11/14/2016 07:20 AM, Matthieu Vanhoutte wrote: > Dear Freesurfer's experts, > > I come back to you concerning questions of registrations. > > Since during the longitudinal process each --long subject directory > has been

Re: [Freesurfer] Longitudinal surface analysis of PET data

Dear Freesurfer's experts, I come back to you concerning questions of registrations. Since during the longitudinal process each --long subject directory has been registered onto the common --base template, shouldn't I: 1) Register PET data onto the subject cross-sectional directory (native

Re: [Freesurfer] Longitudinal surface analysis of PET data

Yes On 09/30/2016 05:05 PM, Matthieu Vanhoutte wrote: > > Hi Douglas, > > Does the surface of the closest MRI time point mean the surface of the > -long subject time point directory rather than cross-sectional subject > time point directory ? > > Best regards, > Matthieu > > > Le 30 sept. 2016

Re: [Freesurfer] Longitudinal surface analysis of PET data

Hi Douglas, Does the surface of the closest MRI time point mean the surface of the -long subject time point directory rather than cross-sectional subject time point directory ? Best regards, Matthieu Le 30 sept. 2016 9:14 PM, "Douglas N Greve" a écrit : > There is

Re: [Freesurfer] Longitudinal surface analysis of PET data

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

Re: [Freesurfer] Longitudinal surface analysis of PET data

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

Re: [Freesurfer] Longitudinal surface analysis of PET data

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,

Re: [Freesurfer] Longitudinal surface analysis of PET data

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