Brain Scans

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  • Brain Scans
    • CAT Scans
      • (Computerised Axial Tomography)
  • Easier to plan surgery
    • Accurately see structures of brain before going in
  • (Position Emission Tomography)
    • PET Scans
      • Brain Scans
        • CAT Scans
          • (Computerised Axial Tomography)
      • Patient injected with radioactive substance FDG which conducts the scan
  • Evaluation
    • Cant have too many
    • Predict issues in the future
    • More invasive than CAT scans
  • FMRI
    • (Functional Magnetic Resonance Imaging)
  • Scans blood flow in  the brain
    • Head placed in a large electromagnet
      • as neural activity increases in the brain, blood flow increases
    • FMRI
      • (Functional Magnetic Resonance Imaging)
  • Active areas need more blood and the scan shows where the blood is going
    • Haemoglobin, when oxygenated, repel magnetic field
    • as neural activity increases in the brain, blood flow increases
    • Haemoglobin, when deoxygenated, goes with the magnetic field
    • These differences are used to create an image
      • Evaluation
        • Claustrophobia - Stress
          • Have to lie flat and still in a large tube for the duration of the scan
        • Non-invasive
        • Unsuitable for some - magnet
          • Anyone with a cardiac pacemaker or  has had recent  metal surgical implants wouldn't be able to have one of these exams

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