Magnetic resonance imaging (MRI) is a medical examination technique using radiology to create pictures of the anatomy and physiological processes of the human body. MRI scanners use magnets, strong magnetic fields, magnetic field gradients, and radio waves to generate images of the body’s interior. An MRI is often used to diagnose or analyze conditions affecting soft tissues, such as tumors or brain disorders, as well as bones, muscles, and blood vessels. Unlike an X-ray, MRIs use no ionizing radiation.