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[(11)C]Loperamide has been proposed for imaging P-glycoprotein (P-gp) function with positron emission tomography (PET), but its metabolism to [N-methyl-(11)C] N-desmethyl-loperamide ([(11)C]dLop; [(11)C]3) precludes quantification. We considered that [(11)C]3 might itself be a superior radiotracer for imaging brain P-gp function and therefore aimed to(More)
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