Diane, I'm afraid I can't answer your question, but I too am going for a PET scan. I am going because of my rapid deterioration [I can no longer walk], the fact that my meds [now Sinement & Requip after trying all the others] have little effect, and my suspicion that I have multiple system atrophy, PD+ [they have ruled out PSP,SDS and the one Debbie White's mom has - can't remember its name]. why was one ordered for you? thanks and sorry for being so nosy! B. Bruce Anderson (53, 5) Schooley's Mtn., NJ [log in to unmask]