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The brain - scans and imaging

The brain - scans and imaging



Brain scans and imaging

Brain scans and imaging



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    The brain - scans and imaging The brain - scans and imaging Presentation Transcript

    • Different types of scans and imaging
      The Brain
    • MRI/MRA
      Uses magnetic field and radio waves
      The nuclei of atoms line up in the direction of the magnetic field
      Hydrogen atoms in water are monitored
      The hydrogen atoms become excited with more energy due to radio waves, once gone the energy is released and detected
      Used in diagnosis of tumours, strokes, brain injuries and infections of the brain and spine
    • fMRI
      Possible to study human activities
      Looks at functions using oxygen uptake
      Deoxygenhaemoglobin absorbs radio waves
      Part of brain activated needs more oxygen, less radio waves absorbed
      Can produce 4 images per second
    • PET scanning
      Positron Emission Tomography
      Detects the radiation emitted from radioactive substances injected into the body
      Gamma rays given off are detected by PET
      Gamma rays are converted to photons of light, and electrical signals
      The signals convert into slices of images
      Can show glucose metabolism in the brain, detect cancer, detect memory disorders and seizures, map brain function
    • CT/ CAT scanning
      Computerised Axial Tomography
      Use thousands of narrow-beam X-rays to pass through the tissue at different angles
      X-rays are detected forming slices of images of the tissues
      CT looks at structures rather than functions
      Used to detect brain disease
      Small structures cannot be distinguished
    • qEEG/ Brain Mapping
      Can be used in real time as you don’t need to keep still
      Sensors are attached to the scalp measuring activity from there
      The main use is research into brain function
      No risks (unlike CT scans for example)
      They are not as spatially accurate as fMRI