An MRI (Magnetic Resonance Imaging) uses a magnetic field and radio waves to create pictures of organs and other tissues in the body. It is able to give physicians different information than they can get from X-rays and CT scans.
An MRI will not diagnose a concussion. MRIs are generally not used in acute concussion management. However, your doctor may order an MRI to evaluate for pre-existing conditions when injuries last for an extended period of time or progressively worsen.