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The availability of new PET ligands offers the potential to measure fibrillar β-amyloid in the brain. Nevertheless, physiologic information in the form of perfusion or metabolism may still be useful in differentiating causes of dementia during life. In this study, we investigated whether early (11)C-Pittsburgh compound B ((11)C-PIB) PET frames (perfusion (11)C-PIB [pPIB]) could provide information equivalent to blood flow and metabolism. First, we assessed the similarity of pPIB and (18)F-FDG PET images in a test cohort with various clinical diagnoses (n = 10), and then we validated the results in a cohort of patients with Alzheimer disease (AD) (n = 42; mean age ± SD, 66.6 ± 10.6 y; mean Mini-Mental State Examination [MMSE] score ± SD, 22.2 ± 6.0) or frontotemporal lobar degeneration (FTLD) (n = 31; age ± SD, 63.9 ± 7.1 y, mean MMSE score ± SD, 23.8 ± 6.7).

Early 11C-PIB Frames and 18F-FDG PET Measures Are Comparable: A Study Validated in a Cohort of AD and FTLD Patients

Early ¹¹C-PIB Frames and ¹⁸F-FDG PET Measures Are Comparable: A Study Validated in a Cohort of AD and FTLD Patients