Background: Positron Emission Tomography (PET) imaging is revolutionizing the study of
psychiatric disorders by enabling the visualization of underlying neurobiological mechanisms. Psychiatric conditions such as depression, schizophrenia, and bipolar disorder often involve
neuroinflammation and altered neurotransmitter systems, which
PET imaging can map with precision. This approach offers critical insights into the diagnosis, monitoring, and personalization of treatment for these complex disorders. Materials and Methods: To explore the role of
PET imaging in psychiatric disorders, a systematic review was conducted using databases such as PubMed and Scopus. Search keywords included "PET imaging," "psychiatric disorders," and "neuroinflammation." Relevant studies were identified and analyzed to highlight advancements, applications, and challenges in this field. Results: Neuroinflammation, a key feature of psychiatric disorders, can be effectively detected using radioligands targeting the translocator protein (TSPO), a biomarker of microglial activation.
PET imaging of TSPO has revealed inflammation patterns in disorders like major depressive disorder and schizophrenia, improving the understanding of their pathophysiology. PET-MRI hybrid systems further enhance diagnostic precision by combining PET's functional imaging with MRI's anatomical detail. This integration supports comprehensive evaluations, such as identifying structural and functional changes in bipolar disorder and frontotemporal dementia. However, challenges persist, including variability in TSPO expression, high costs, and the need for improved radiotracers. Conclusion:
PET imaging has advanced our understanding of
psychiatric disorders by providing detailed insights into neuroinflammatory processes and functional brain changes. Despite limitations, ongoing innovations in radiotracer technology and multimodal imaging systems promise broader clinical applicability. These advancements position
PET imaging as a key tool for personalized psychiatric diagnostics and treatment.
