An MRI scan uses a powerful magnetic field and radio waves to take detailed, 3-D pictures of the body.
The human body is 80 percent water, so it contains millions of hydrogen atoms. When these atoms come into contact with the MRI’s magnetic field, they all line up in the same direction. The radio waves the MRI produces disrupt this alignment when they’re added to the magnetic field.
After the radiofrequency is turned off, the atoms return to their original position. How long this takes depends on the type of tissue. A sensor in the MRI machine calculates how long it takes for the atoms to realign with the magnetic field. The results are translated into images.
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