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The central type benzodiazepine receptors were studied in 17 healthy human subjects with  11 C–RO 15 1788 and positron emission tomography (PET). The brain regional distribution of the tracer in eight control studies performed after injection of trace doses of  11 C-RO 15 1788 was consistent with that of benzodiazepine receptors. Saturation studies with co-injected cold RO 15 1788 in the remaining subjects showed a dose-dependent decrease of brain radiotracer until full inhibition of specific binding was achieved with doses above 0.1 mg/kg (four studies). Based on the results, a simple method to estimate the specifically bound  11 C-RO 15 1788 regionally in a single PET study is proposed, using the data from the full-saturation studies as a stable estimate of the nondisplaceable radioligand concentration. Using this method, it was found that quasiequilibrium between the estimated specifically bound and nondisplaceable components was achieved at times equal to or longer than 20 min after tracer administration. The validity of this method was partly supported by further results, showing a good agreement between the regional specific binding so calculated and postmortem data of receptor density.

Regional Specific Binding of [11C]RO 15 1788 to Central Type Benzodiazepine Receptors in Human Brain: Quantitative Evaluation by PET

Regional Specific Binding of [¹¹C]RO 15 1788 to Central Type Benzodiazepine Receptors in Human Brain: Quantitative Evaluation by PET