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Actually, it is quite similar to an MRI. BUT, I had to be motionless for 2.5 HOURS, my head was TIED down, and they inject a chemical into a vein in one arm while taking blood out of an artery on the other. This is also a continuous process. And all of this happens AFTER you've been without food or medication for over 12 hours. I had severe diarrhea and dizziness after it was over. NOT a fun-filled day! Jim Finn