The potential of neuromelanin-sensitive MRI in psychiatric disorders.

Psychiatric disorders represent a significant public health concern due to their high prevalence and substantial impact across the lifespan. Despite advances in understanding their neurobiological underpinnings, the transdiagnostic mechanisms driving psychiatric conditions remain unclear. Neuromelanin-sensitive magnetic resonance imaging (NM-MRI) is an emerging, non-invasive technique for investigating the dopaminergic (DA) and norepinephric (NE) systems, offering valuable insights into their role in psychiatric disorders. This review explores the potential of NM-MRI in psychiatric research, emphasizing its ability to reveal links between DA and NE dysregulation and psychiatric conditions, therewith offering insights in neurobiological mechanisms. We summarize current NM-MRI findings across psychiatric disorders, including psychosis, mood disorders, and anxiety disorders. Overall, NM-MRI has shown considerable potential in studying psychiatric conditions such as schizophrenia, addiction, and depression. However, its application remains limited in disorders like anxiety, obsessive compulsive disorder, and neurodevelopmental disorders, despite their known associations with DA and NE dysfunction. To fully establish NM-MRI as a clinical research tool, further efforts are needed to standardize protocols and improve the technique’s specificity and reliability in psychiatric contexts. Moreover, longitudinal studies and cross-diagnostic comparisons are essential to establish NM-MRI as a potential marker for treatment response and identifying individuals at risk of developing psychiatric disorders. Current review underscores the promise of NM-MRI's for early diagnosis, intervention, and advancing mental health research.