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MRI or Magnetic Resonance Imaging: A special radiology technique designed to look at internal structures of the body using magnetism, radio waves, and a computer to produce the images of body parts. The MRI scanner is a tube surrounded by a giant circular magnet. The patient is placed on a moveable bed that is inserted into the magnet. A computer processes information received, and an image is produced. The image and resolution is quite detailed and can detect tiny changes of structures within the body. Procedure for a MRI is very noisy and usually takes at least 1 hour.