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FDG PET imaging in patients with pathologically verified dementia.
J M Hoffman1, K A Welsh-Bohmer, M Hanson
1National Cancer Institute, Diagnostic Imaging Program, Bethesda, Maryland 20892-7440, USA.
Summary
This study confirms bilateral temporo-parietal hypometabolism on FDG PET scans is a key indicator for Alzheimer's disease (AD). This metabolic pattern aids in differentiating AD from other dementia causes, showing acceptable diagnostic accuracy.
Area of Science:
- Neurology
- Nuclear Medicine
- Pathology
Background:
- Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
- FDG PET imaging is used to assess brain metabolism.
- Bilateral temporo-parietal hypometabolism is a suspected metabolic pattern in AD.
Purpose of the Study:
- To pathologically verify the association between bilateral temporo-parietal hypometabolism and AD.
- To assess the diagnostic accuracy of this metabolic pattern in differentiating AD from other dementias.
Main Methods:
- Evaluated 22 patients with dementia and eventual pathologic confirmation.
- Acquired FDG PET brain scans for visual grading of hypometabolism.
- Determined sensitivity, specificity, and diagnostic accuracy using pathologic diagnosis as the gold standard.
Main Results:
- Bilateral temporo-parietal hypometabolism showed 93% sensitivity, 63% specificity, and 82% diagnostic accuracy for AD.
- Clinical diagnosis of probable AD had 63% sensitivity and 100% specificity.
- FDG PET findings were crucial in differentiating dementia causes.
Conclusions:
- Confirms bilateral temporo-parietal hypometabolism as the classic metabolic abnormality in AD.
- Suggests alternative dementia causes when FDG PET shows other patterns.
- FDG PET has acceptable sensitivity, specificity, and accuracy for dementia evaluation, especially for confirming AD suspicion.