> during coregistration SPM already allows a full affine transformation,
> i.e. all 12 parameters from translation, rotation, zoom and sheer (it
> has to be since coregistration is intended for intra-modality
> registration, that hence has different distortions/sizes). It is during
> realignment that a rigid-body only transformation is applied.
Actually, SPM's coregistration only does a 6 parameter transform by default,
although it can be coaxed into using 12 - but not via the user interface.
Best regards,
-John
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