Quantitative MRI (magnetic resonance imaging) is a research area that focuses on using MRI technology to quantitatively measure various aspects of tissue structure, function, and composition. This includes measuring tissue properties such as relaxation times, diffusivity, and perfusion in a more precise and objective manner. This approach allows for more accurate diagnosis and monitoring of various diseases and conditions, as well as for assessing treatment effectiveness. Quantitative MRI techniques are particularly useful for studying neurodegenerative diseases, cancers, and cardiovascular diseases.