Magnetic resonance imaging (MRI) is a medical imaging technique that uses a magnetic field and computer-generated radio waves to create detailed images of the organs and tissues in your body.

 

MRI machines are usually large, tube-shape magnets. When lying in an MRI machine, the magnet realigns the body's water molecules. These aligned atoms produce signals, which are used to create MRI images. 

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MRI is a noninvasive way for your doctor to examine your organs, tissues and skeletal system. It produces high-resolution images of the inside of the body that help diagnose a variety of problems.