PSYCH 025: Nuclear Magnetic Resonance Imaging and Spectroscopy: Basic Principles and Recent Findings in Neuropsychiatric Disorders

Much of psychiatry has historically relied on inference - understanding brain function indirectly through behaviour and experience. Nuclear magnetic resonance (NMR) techniques, including MRI and spectroscopy, have transformed this landscape, allowing us to visualise both structure and chemistry in vivo.In this episode, we explore the principles underlying magnetic resonance imaging - how magnetic fields and radiofrequency signals are used to generate detailed images of brain anatomy. We then move beyond structure to spectroscopy, which provides insight into the brain’s biochemical composition.These tools allow us to observe patterns associated with psychiatric disorders - changes in volume, connectivity, and neurochemical markers. Yet interpretation remains complex: findings are often subtle, variable, and not specific to a single condition.We examine how these technologies contribute to research and, increasingly, clinical practice - while also recognising their limitations. Imaging does not “diagnose” psychiatry in isolation; it adds another layer of understanding to an already complex picture.This chapter reflects a broader shift: from unseen processes to visualised systems - offering a window into the living brain, while reminding us that what we see is only part of the story.Key Takeaways* MRI uses magnetic fields and radiofrequency signals to image brain structure.* Spectroscopy provides information about brain biochemistry in vivo.* These techniques allow observation of structural and chemical changes in psychiatric disorders.* Findings are often subtle and not specific to individual diagnoses.* Imaging enhances understanding but does not replace clinical assessment.* Interpretation requires integration with broader clinical and scientific context.* Neuroimaging is a tool for insight, not a standalone diagnostic solution. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe