Magnetic resonance imaging (MRI) machines allow doctors to see a three-dimensional scan of a patient's internal organs. MRI machines use very powerful magnets to charge the protons of hydrogen atoms in the body's cells. A radio frequency is then aimed at the charged protons. The charged protons absorb the frequency and then reflect it back at the machine. The machine ultimately uses the reflected data to form a three-dimensional image of the area being scanned.
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