Abstract

The latest version of positron emission tomography (PET) imaging systems is the magnetic resonance imaging (MRI) integrated PET device. The integration process of these two separate modalities, both of which are the most powerful in their respective fields and clinical acceptance of this combination has been quite painful and slow compared to PET/computed tomography (PET/CT), and the process still continues to mature. Having superior tissue contrast due to its multiparametric imaging ability and high soft tissue resolution together with excluding ionizing radiation are the most important advantages of MRI, and hybrid PET/MRI systems differ from PET/CT with these features. In addition, since both modalities can work simultaneously in PET/MRI, it is less affected by internal organ movements and provides a more effective fusion image. Moreover, although the adaptation process to MRI technology and imaging interpretation may seem somewhat difficult for Nuclear Medicine physicians, it is obvious that it will create new excitements and horizons. In this context, in this section, we tried to present the basic working principles of MRI and the basic principles of evaluating MRI from the perspective of a nuclear medicine physician.