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magnetic resonance imaging

Synonyms:
  • MRI
  • NMR
Medical technology. A technique for visualizing internal stuctures of the body, particularly the soft tissues. The object to be viewed is exposed to a strong magnetic field. The atomic cores (e.g., hydrogen atoms) take a certain orientation within the magnetic field. By a radio-frequency pulse, this orientation is deranged. When the nuclei take back their orientation after the pulse, they emit an electromagnetic signal, which is used to give the picture.
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