An MRI (magnetic resonance imaging) is a sophisticated diagnostic technique that is non-invasive and does not use radiation. The MRI uses a magnetic field, radio waves, and a computer to generate detailed 2-dimensional images rather than flat x-ray images. The MRI can be used to detect cancer in a variety of organs and tissues. The images are so clear that many organs can be seen in great detail. The MRI can also detect injuries, disorders, and diseases affecting tendons, ligaments, cartilage, and bone marrow.