Ottoy J, Verhaeghe J, Niemantsverdriet E, De Roeck E, Wyffels L, Ceyssens S, Van Broeckhoven C, Engelborghs S, Stroobants S, Staelens S. 18F-FDG PET, the early phases and the delivery rate of
18F-AV45 PET as proxies of cerebral blood flow in Alzheimer's disease: Validation against
15O-H
2O PET.
Alzheimers Dement 2019;
15:1172-82. [PMID:
31405824 DOI:
10.1016/j.jalz.2019.05.010]
[Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 04/27/2019] [Accepted: 05/21/2019] [Indexed: 11/22/2022]
Abstract
INTRODUCTION
Dual-biomarker positron emission tomography (PET), providing complementary information on cerebral blood flow and amyloid-β deposition, is of clinical interest for Alzheimer's disease (AD). The purpose of this study was to validate the perfusion components of early-phase 18F-florbetapir (eAV45), the 18F-AV45 delivery rate (R1), and 18F-FDG against 15O-H2O PET and assess how they change with disease severity.
METHODS
This study included ten controls, 19 amnestic mild cognitive impairment, and 10 AD dementia subjects. Within-subject regional correlations between modalities, between-group regional and voxel-wise analyses of covariance per modality, and receiver operating characteristic analyses for discrimination between groups were performed.
RESULTS
FDG standardized uptake value ratio, eAV45 (0-2 min) standardized uptake value ratio, and AV45-R1 were significantly associated with H2O PET (regional Pearson r = 0.54-0.82, 0.70-0.94, and 0.65-0.92, respectively; P < .001). All modalities confirmed reduced cerebral blood flow in the posterior cingulate of patients with amnestic mild cognitive impairment and AD dementia, which was associated with lower cognition (r = 0.36-0.65, P < .025) and could discriminate between patient and control groups (area under the curve > 0.80). However, eAV45 was less sensitive to reflect the disease severity than AV45-R1 or FDG.
DISCUSSION
R1 is preferable over eAV45 for accurate representation of brain perfusion in dual-biomarker PET for AD.
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