If you have a recon-ned structural MRI corresponding to your PET scan then the answer is yes.

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of Camargo, Aldo <ACamargo@som.umaryland.edu>
Sent: Saturday, July 25, 2020 12:19 AM
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Coregistration to MNI

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Hi Freesurfer experts,

I want to coregister a PET image to the MNI space, can I use mri_cvs_register ?

Thanks a lot,

Aldo Camargo