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Summed brain images for 11C-d-methamphetamine (top row, from 0–90 min) and 11C-l-(—)-cocaine (bottom row, from 0–54 min) in same animal. 11C distribution is widespread over cortical and subcortical brain regions for 11C-d-methamphetamine but is highly localized in striatum for 11C-(—)-cocaine. Images are coregistered to MRI atlas (20).
