Balancing bias, reliability, noise properties and the need for parametric maps in quantitative ligand PET: [11C]diprenorphine test-retest data. - Alexander Hammers; Marie-Claude Asselin; Federico E. Turkheimer; Rainer Hinz; Safiye Osman; Gary Hotton; David J. Brooks; John S. Duncan; Matthias J. Koepp (NeuroImage, 2007)