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Bruce - Dick had several days of PET scans at North Shore Univ. Med Center on Long Island. The scan consisted of his lying on a table with his head inside the scanner. I believe radioisotopes are injected. They had to wait a certain period of time for the isotopes to get to the brain, then the scanning took place. I can't tell you about a "normal" PET scan, because his was part of an study of those who'd had stimulators implanted. For that reason, I believe his lasted longer than the normal ones would. There was no pain involved, other than the "stick" when they injected the isotope or whatever. He was on the table long enough that it was uncomfortable on his back, but his back is very touchy. We saw the full-color images that the PET scan produces. Doctors can clearly differentiate between the brain of a PWP and a non-PWP using the PET scan, I believe. We could see the difference outselves when we knew what we were looking for. I also had a PET scan while I was there because I volunteered to be part of a supposedly "normal" control group - first time MY brain has ever been regarded as "normal". <grin> I can verify that there was no pain involved. I even took a nap on the table! You might also try looking up PET scan on the internet. Margie Swindler, cg for Dick, 54/17 << A neurologist last week recommended I get a Pet scan and wrote me a prescription for one. He then ducked ou t before I had a chance to ask him about it. Can anyone tell me what it is, what it's suppose to diagnose and what it's like? It must be pretty rare because he said I would have to go to Columbia Univ., Hosp, in NYC for it and I live in western NJ. Thanks >>