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- W76604410 abstract "Local cerebral blood flow (LCBF) determination as applied to positron emission tomography (PET) studies with 0-15 labeled water typically utilizes a single compartment model. Five assumptions characterize this model: spatial homogeneity, rapid equilibration across the blood-brain barrier (BBB), constant flow and partition coefficients during the experiment, trappings of the tracer is neglected, and peripherally measured arterial tracer concentrations represent the true input function. In this study a two compartmental model is developed to overcome the problems of limited diffusion of water across the BBB, of lower than expected volume of distribution of 0-15 labeled water and of inconsistent LCBF determination over the time course of a PET study. Model parameters are estimated using a least squares algorithm from PET data obtained from a bolus injection of 0-15 labeled water. The input function was obtained from continuously measured radioactivity concentration of blood samples from the radial artery of the arm. At short times ( few min.) is insensitive to flow and instead appears to be dependent upon tissue diffusion characteristics." @default.
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- W76604410 date "1985-05-01" @default.
- W76604410 modified "2023-09-23" @default.
- W76604410 title "A two compartmental model for determination of local cerebral blood flow" @default.
- W76604410 hasPublicationYear "1985" @default.
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