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The brain - scans and imaging
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The brain - scans and imaging


Brain scans and imaging

Brain scans and imaging

Published in Education , Health & Medicine
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  • 1. Different types of scans and imaging
    The Brain
  • 2. 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
  • 3. 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
  • 4. 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
  • 5. 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
  • 6. 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