The only way to do this in SPM is to write some new code. The
parameterisation is hard-coded in spm_matrix.m.
On Tuesday 21 October 2008 16:08, Anil Rao wrote:
> I am wanting to do an affine registration consisting of an isotropic
> scaling plus rigid body transformation (RBT) to register some images from
> different modalities.
> "Co-register" in spm5 allows me to do a RBT with norm mutual info, but not
> with the extra isotropic scaling. Is there an easy way in SPM5 to include
> the isotropic scaling factor in the registration or pre/post estimation of
> the RBT parameters?
> Any help much appreciated!