In some situations a subject who has undergone a functional PET, but not an MRI, might also have had a more "anatomical PET" (e.g. FDG). In this case, the "anatomical PET" can be used for stereotactic normalization, and the resulting transformation applied to the functional PET. Essentially, the "anatomical PET" will take the role of the MRI in the PET-MRI workflow described above. In the following workflow the "anatomical PET" series will be called "FDG PET".
