> Does anybody knows how can I register two images (between modality, > within subject) using nonlinear warping and Normalized Mutual > Information. I mean, how should I set the defaults and what subroutine > is the appropriate for it (e.g. spm_coreg or spm_normalise or simply > spm_affreg or another) I'm afraid that there is nothing in SPM that will do this for you. You would need to try some other software. I don't have any good recommendations, but the following links may help. http://www.cma.mgh.harvard.edu/iatr/ http://idoimaging.com/index.shtml Best regards, -John