Diffusion MRI is a type of MRI imaging technique that measures the movement or diffusion of water molecules within tissues. This technique provides valuable information about the microstructure of tissues, such as the organization of nerve fibers in the brain or the integrity of white matter tracts. Diffusion MRI is commonly used in research and clinical settings to study various neurological conditions, such as traumatic brain injury, stroke, and neurodegenerative diseases. By mapping the diffusion of water molecules, researchers can gain insights into the underlying architecture of tissues and track changes over time, providing a non-invasive way to investigate the brain's structure and function.