The brain - scans and imaging

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Brain scans and imaging

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The brain - scans and imaging

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

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