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AKA:
magnetic resonance imaging (MRI)
The use of magnetic fields and radio waves (instead
of the X-rays employed in the CT scan) to visualize
body structures and how they function. The powerful
magnet, large enough to enclose the body, forces
the atomic nuclei in most material such as soft
tissue to align themselves with the magnetic field.
Radio waves are aimed at the selected area to excite
the atoms which, when the waves are stopped, emit
signals that are converted to computer-generated
pictures. NMR is used to detect diseases of soft
tissues, heart, brain, and spinal cord. |
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