Olfactory function can be evaluated using standardised psychophysical tests, like UPSIT or Sniffin’ Sticks, allowing a categorization into normosmia, hyposmia, or anosmia. Regarding results from functional MRI, it is important to note that people with anosmia exhibit normal patterns of activation in key olfactory brain regions even though they have no smell function. In addition to FMRI, diffusion imaging, or diffusion weighted imaging, is used to understand structural changes in the brain, in particular white matter integrity. However, it still remains to be seen how this develops into a clinical routine.