MRI scan

My husband had his MRI scan today at St. Lucas Zienkenhuis... then we are going to wait for a week before we will get the result... This is important for the doctor to know exactly what's the cause of Ron's lower back pain and left leg pain since December 24....
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I tried to get some information what is MRI scan. In Wikipedia MRI means - Magnetic resonance imaging (MRI), or nuclear magnetic resonance imaging (NMRI), is primarily a medical imaging technique most commonly used in radiology to visualize the structure and function of the body. It provides detailed images of the body in any plane. MRI provides much greater contrast between the different soft tissues of the body than computed tomography (CT) does, making it especially useful in neurological (brain), musculoskeletal, cardiovascular, and oncological (cancer) imaging.