
Keywords: BG، ganglia basal; PET, positron emission tomography; BPND, non-displaceable binding potential; MOR, μ-opioid receptor; CFN, carfentanil; RCL, raclopride; OPRM1, human μ-opioid receptor; BG, basal ganglia; NAC, nucleus accumbens; DN, denicotinized; N, nicotine; HC, healthy