For anyone else you might be interested, I just got a tip by Guillaume (thanks!) how to do so within SPM:
Dear Helmut,
if you want to manually coregister two images within SPM, you can do the
following:
* CheckReg: select the two images
* Right-click on one of them:
Reorient image(s) > Current image
This will overlay the contours of one image onto the other.
* Define transformation in the Interactive window
* Apply to images
You still have to type the parameters manually so it's not very user
friendly but might be sufficient for your needs.
Best regards,
Guillaume.
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