ABSTRACT

Positron emission tomography (PET) and magnetic resonance imaging (MRI) are prominent examples of functional and morphological imaging modalities, respectively. The imaging concepts of PET and MRI are quite different, as are the images. MRI and PET are useful in conjunction precisely because they are complementary. While PET is able to provide information about a specific function

such as cerebral blood flow or the density of a receptor in a certain area, MRI defines different structures or tissue types, and thus provides information about morphology and the topology of structures. Both imaging modalities are useful for clinical studies as well as for basic scientific investigations.