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Positron Emission Tomography (PET) is used to measure amyloid plaques in the brain.  Amyloid plaques are one of the hallmarks of the pathology of Alzheimer’s disease.

What is involved?

  • A small amount of radioactive chemical (tracer) is injected into a vein in the arm.
  • About 20 minutes later, a scan of the brain is taken.  This involves lying still in a CAT scanner for about 10 minutes.