The article discusses the use of nuclear psychiatric imaging as a trend in precise diagnosis for mental disorders. It highlights the prevalence of mental health conditions globally and the burden they place on society. The article emphasizes the need for non-invasive and real-time brain detection methods to bridge the gap between clinical manifestations and molecular mechanisms of mental disorders. It explores the use of molecular imaging techniques, such as positron emission tomography (PET), to visualize and quantify pathophysiological changes in mental disorders. The article also suggests future directions for research, including the development of specific molecular targets, optimization of imaging approaches, and exploration of new analytical methods. Overall, nuclear psychiatric imaging has the potential to improve the diagnosis and management of mental disorders. [Extracted from the article]