T1-weighted imaging is a type of magnetic resonance imaging (MRI) technique that highlights differences in tissue relaxation times. It provides clear images of anatomical structures, making it useful for assessing brain anatomy, fat, and certain types of tumors. In T1-weighted images, fat appears bright, while water and fluids appear darker. This imaging method is particularly valuable in clinical settings for evaluating conditions like multiple sclerosis and brain tumors. By using specific parameters during the MRI scan, radiologists can obtain detailed images that help in diagnosing and monitoring various medical conditions.