[[Positron emission tomography]]–[[magnetic resonance imaging]] (PET–MRI) is a hybrid imaging technology that incorporates magnetic resonance imaging (MRI) soft tissue morphological imaging and positron emission tomography (PET) functional imaging.

Simultaneous [[PET/MRI]] detection was first demonstrated in [[1997]], however, it took another 13 years, and new detector technologies, for clinical systems to become commercially available.