MRI

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  • Created by: cjt123
  • Created on: 14-04-16 12:16
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  • MRI
    • How it Works
      • Surrounding the patient is a magnetic field produced by a super-conducting magnet and radio coils
      • A pulse of radio waves is emitted by the coils which causes the hydrogen nuclei to flip to their higher energy state
        • The radio waves are switched off and as the nuclei return to their lower energy state they emit radio signals
          • These signals are detected and processed by a computer to provide a display of the tissues in the body
    • Disadvantages
      • The strong magnetic field requires special safety measures with regards to metal objects
      • A scan can take up to 20 mins
      • Can be noisy and frightening
      • Very expensive to cool superconductors used to produce the magenetic field using liquid helium
    • Advantages
      • Uses radio waves and not ionising radiation so is thought to be safe
      • Can produce images that allow very fine detail to be seen
        • MRI can reveal the small differences between tissues that are very similar
    • Uses
      • Used to identify tumours
      • Can identify multiple sclerosis
      • Used to examine the anatomy of the brain
      • Often used on athletes to identify ligament damage and problems in the joints

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