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- W3147260206 abstract "Lumped and transfer rate constants in ischemic brain tissue must be measured to estimate accurately cerebral glucose utilization by the deoxyglucose method. We studied the bilateral middle cerebral artery occlusion model in 17 cats, 5 with a 1-hour occlusion, 5 with a 4-hour occlusion, and 7 with a sham operation. The time course of cerebral tissue radioactivity (Ci*(t)) was monitored by external coincidence counting during a programmed infusion of [18F]-2-deoxy-2-fluoro-d-glucose (18F-2-FDG). Arterial plasma concentration (Cp*(t)) of the tracer was kept constant during the first 45 minutes. Rate constants were estimated from Ci*(t) and Cp*(t) by a nonlinear least-squares fitting routine. The lumped constant was estimated from the fit of the ratio of extraction fractions of glucose and 18F-2-FDG by nonweighted, nonlinear least-squares fitting. In the 4-hour-occlusion model, the transfer constant k1* was 23% lower, k3* 39% lower, and the lumped constant 78% higher than in the sham-operated animals. In the ..." @default.
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- W3147260206 date "1987-01-01" @default.
- W3147260206 modified "2023-09-23" @default.
- W3147260206 title "Simultaneous in vivo measurement of lumped constant and rate constants in experimental cerebral ischemia using F-18 FDG." @default.
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