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- W2279331247 abstract "For over 20 years, researchers have used the tracer [18F]fluorodeoxyglucose (FDG) in positron emission tomography (PET) imaging. FDG PET imaging has been utilized to study the characteristic metabolic changes in Alzheimer’s disease (AD), and as more molecular imaging tracers become available for human research, PET will likely assume many new roles for investigating more specific abnormalities, such as amyloid deposition, in the future. FDG is a glucose analog that images glucose metabolism and also illustrates neural firing. Different synapse activity, particularly excitatory activity from glutamate release, appears to change FDG uptake. AD will affect both brain infrastructure by decreasing the amount of cell bodies and synapses as well as decreasing synaptic activity, which are both changes that decrease the amount of FDG. AD is not a perfectly uniform process, and this is reflected by distinct progressive patterns of decreased FDG and decreased metabolism across different regions of the brain. FDG enters the brain via blood flow, and then into brain tissue by both diffusion and facilitated transport. Once it enters the glia and neurons, FDG can be phosphorylated, a step that is essentially irreversible, but then cannot be processed further by the cells, effectively trapping the FDG in situ. The amount of trapping that occurs in the brain over the first 10–20 minutes is very high and constitutes over 80% of the uptake. Thus, after the first 10–20 minutes uptake phase, a pattern of FDG emerges that mirrors the distribution of glucose metabolism in all subcortical and cortical structures." @default.
- W2279331247 created "2016-06-24" @default.
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- W2279331247 date "2008-01-01" @default.
- W2279331247 modified "2023-09-25" @default.
- W2279331247 title "FDG and Amyloid Positron Emission Tomography" @default.
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- W2279331247 doi "https://doi.org/10.1017/s1092852900027000" @default.
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