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Lest some others get hopes up in vain, I'll repeat a comment that may not have gotten through before. This comes from the 1992 Merck Manual, a bit dated but I think still true: "...being used clinically in a few centers, but it remains primarily a research tool. The PET scanner is very expensive, and many of the most useful radionuclides have very short half-lives generally requiring an on-site cyclotron." A couple of newer scanning techniques, single-photon-emission computed tomography (SPECT) and magnetic resonance spectroscopy (MRS) are cheaper and more likely to come into use for routine diagnosis. Cheers, Joe -- J. R. Bruman (818) 789-3694 3527 Cody Road Sherman Oaks, CA 91403-5013