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Regarding a cheaper substitute for PET scanning, I believe you are thinking about SPECT (Single-Photon-Emission Computed Tomography). Don't know much about it but there are two articles (cited in CSR APR 96) in Neurology, 1996;46:278-285 and 231-237. Said to be less precise than PET, and still in early development, but already has yielded some useful research results. Cheers, Joe J. R. Bruman (818) 789-3694 3527 Cody Road Sherman Oaks CA 91403