2020
DOI: 10.1212/wnl.0000000000010256
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Multitracer model for staging cortical amyloid deposition using PET imaging

Abstract: Objective:To develop and evaluate a model for staging cortical amyloid deposition using PET with high generalizability.Methods:3027 subjects (1763 Cognitively Unimpaired (CU), 658 Impaired, 467 Alzheimer’s disease (AD) dementia, 111 non-AD dementia, and 28 with missing diagnosis) from six cohorts (EMIF-AD, ALFA, ABIDE, ADC, OASIS-3, ADNI) who underwent amyloid PET were retrospectively included; 1049 subjects had follow-up scans. Applying dataset-specific cut-offs to global Standard Uptake Value ratio (SUVr) va… Show more

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Cited by 67 publications
(112 citation statements)
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“…Some of these methodologic differences may be responsible for the discrepant regional sequences observed. For instance, entorhinal cortical accumulation occurred early in an autopsy study (14), but several PET studies contradicted this (27,35). Cingulate and medial frontal regions showed an early accumulation in most PET studies (26)(27)(28)(29)35,37); however, other early regions, such as precuneus, are less robustly reported.…”
Section: Discussion Of Applied Methodologiesmentioning
confidence: 99%
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“…Some of these methodologic differences may be responsible for the discrepant regional sequences observed. For instance, entorhinal cortical accumulation occurred early in an autopsy study (14), but several PET studies contradicted this (27,35). Cingulate and medial frontal regions showed an early accumulation in most PET studies (26)(27)(28)(29)35,37); however, other early regions, such as precuneus, are less robustly reported.…”
Section: Discussion Of Applied Methodologiesmentioning
confidence: 99%
“…Additionally, a decreased PET sensitivity to amyloid at the extremes of deposition could occur; the first regional deposits with low amyloid concentrations may be missed by global PET imaging (9,12,23), and end-of-life regional deposits are often masked by cerebral atrophy (2,42). PET amyloid tracers also have varying dynamic ranges in terms of the maximum signal strength in positive compared with negative cases (35). These varying ranges could lead to discrepancies when comparing scans from different tracers, hence the value of normalization measures such as the centiloid scale (22).…”
Section: Discussion Of Applied Methodologiesmentioning
confidence: 99%
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