> The problem I'm having is with the distortions. I've tried MI and AIR's
> alignlinear, both of which gave me suboptimal results. Is there a way to
> use spm's normalize function to perform some nonlinear warping using the
> mprage as the target and the b0 as the source? I'm not sure if it will
> handle cross-modality registration.
There's nothing in SPM that will do this yet. I know that a couple of people
have developed programs for such intra-subject inter-modality nonlinear
warping in the phase-encode direction, but I don't think they have been made
generally available.
Another approach would be to collect data to generate a fieldmap, which could
be used for estimating the amount of distortion.
Best regards,
-John
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