A 25-year-old male asked:
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what can a fdg18-pet ct fusion scan see / diagnose ? and what can it miss? just curious.my memory has been getting worse but my pet ct scan was normal

2 doctor answers
Dr. Gerald Mandell
51 years experience Nuclear Medicine
Metabolism: Pet ct scan of brain looking for increased or decreased up take of f18 fdg, metabolism of glucose. Glucose metabolism is high in areas of tumor and infection. Can be decreased in necrosis, sometimes seizure focus, infarction. If positive may correlate with mr scan of brain.The pet ct can miss very small ares of abnormality or processes that are not particularly metabolically active.
Answered on Dec 22, 2013
Dr. Brian Wosnitzer
17 years experience Nuclear Medicine
Brain PET...: Brain pet with FDG can show hypometabolism in types of dementia such as alzheimer's, frontotemporal, and lewy body. Other pet tracers such as f18-florbetapir (amyvid) can be helpful in identifying beta amyloid plaques which can be associated with dementia such as alzheimer's. Mri may provide you with additional information. Fdg can also be used to identify tumor, infection, and seizure foci.
Answered on Jun 25, 2014

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