Mach RH, Gage HD, Buchheimer N, Huang Y, Kuhner R, Wu L, Morton TE, Ehrenkaufer RL. N-[18F]4'-fluorobenzylpiperidin-4yl-(2-fluorophenyl) acetamide ([18F]FBFPA): a potential fluorine-18 labeled PET radiotracer for imaging sigma-1 receptors in the CNS. Synapse. 2005 Dec 15; 58(4):267-74.