Dear Alain,
you can try to save the atlas maps in native (subject space) in expert mode of CAT12:
cat12('expert')
Then you can use these maps to extract your ROI values for volume-based atlases.
However, there is again an option to also use surface-based atlas ROIs:
- Co-register T1 to your FDG data
- Run CAT12 with the T1 and also enable surface processing
- Map unsmoothed FDG data in native space to surfaces using "Map Volume (Native Space) to Individual Surface"
- Extract ROI-based surface values
There will be in future a less complicated approach to map fMRI or PET data to the native surfaces and extract ROI values in one approach. This might be especially helpful for rfMRI data and can better deal with multiple files. Please keep in mind that for the surface ROIs no information about the cerebellum and sub-cortical areas can be obtained.
Best,
Christian
On Thu, 23 Aug 2018 15:39:45 +0100, Alain Imaging <[log in to unmask]> wrote:
>Hi everyone,
>
>I would like to use CAT12 in order to perform ROIs analysis of PET data.
>Recently, I read this thread (https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1807&L=spm&P=R51199&1=spm&9=A&J=on&d=No+Match%3BMatch%3BMatches&z=4) in which Christian Gaser suggested two different method to use cat12 for PET data. However, the original poster of that question wanted to perform voxel-wise analysis on its PET data. On the other hand, i would like to extract FDG values (in subject space) from the set of ROIs present in the atlases that CAT uses.
>The idea is to linearly register T1 and PET images, than, if this is possible, using CAT to extract the values not only GM and WM values, but also FDG ones. If there is no automatic way of doing this, I still reasoned that at a certain point, CAT must register its atlases to the T1 images, since to my understanding the ROIs values extraction is done in the subject space. Is it possible to access this registration and use them for FDG values extraction ?
>Thanks in advance for any suggestion
>Best
>
>Alain
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