what is magnetic ri
MRI Services at Lifespan. A magnetic resonance imaging (MRI) scan is performed inside of a large, open-ended cylindrical magnet that has a patient table in the center. MRI uses a strong magnetic field and radio waves to make images of the body. Because of this strong magnetic field, it is important to let the technologist know of any metal on or in your body. Some MRI exams require an injection of an MRI contrast or dye. Typical MRI studies require 30 to 60 minutes.