Medical Imaging

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1. A CT scan uses tiny x-rays, true or false?

  • false - magnetic rays are used instead
  • true - they are reduced in strength by density of the tissue they pass through and then detected to form a picture
  • false - no x-rays are used, it is a camera
  • true - they are reflected by tissue according to its colour and detected to form a picture
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2. MRI scans use magnetic fields to create and image, true or false?

  • true
  • false

3. What can be used to make the tissue more visible during a CT scan?

  • a dark room
  • dyes
  • water
  • morphine

4. Which is NOT a drawback of CT?

  • uses x-rays
  • identifies the major tissues
  • less detailed picture

5. How does fMRI monitor oxygen uptake in the brain?

  • oxyhaemoglobin absorbs radiation so active parts light up
  • deoxyhaemoglobin absorbs radio waves so active parts light up
  • deoxyhaemoglobin reflects the radio waves so unactive part lights up
  • parts of the brain with large water content swell up

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