[Freesurfer] mri_vol2surf for sampling spmT_0001.nii on pial surface

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Hi,

i would like to sample the t-values of a SPM output volume (spmT_0001.nii) onto the pial surface of the same subject. The volume is already aligned to the surface files (so if I view the volume as well as the surface files in Freeview they are already aligned).

Therefore I am unsure how to use mri_vol2surf because from my point of view I do not need any registration (srcreg). Nevertheless the registration is required to run the command. I only found the --mni152reg option to avoid specifying a registration.

How I should use the mri_vol2surf command to sample the volume onto the pial surface of the same subject under the condition that surface and volume are already aligned?

Thank you!