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Will, Just catching up on PD digests I noticed this posting by you: << There are only a few PET scan machines..... about 250 in the world the last I heard. They are quite expensive to buy and terribly expensive to operate.... The neurologist I use in New Jersey [in a med school] has to send people [rarely] to London to get a scan done. T'ain't cheap!! Will Johnnston<< Did you read Current Science Reviews? >>Hutchinson M, Raff U; J Neur N'surg Psych 1999;67:815-818: Until now, presymptomatic diagnosis of PD could be done by positron-emission tomography (PET) scan but not by the much cheaper magnetic resonance imaging (MRI) technique. Authors describe a new way of using MRI that may possibly permit such early diagnosis, and later staging of the disease.<< Michael Hutchinson, M.D. (author of the above) is a neuro at NYU/Mt Sinai Medical Center in NYC. You could ask your neurologist if this would work for his patients. It might be more convenient and cost effective. Victoria Nordli cg