Dear Treehouse, ~ Well, close your eyes, pretend to be elsewhere and let clautrophobia go for just a few minutes. You are placed on a narrow table, with [usually padded] supports around your body to keep you from falling off. I think you are usually given an IV for contrast dye to be injected. I think you are asked to keep your arms over your head, but not sure. You and your table are then slid into a tunnel or large tube which may make loud whirring noises for awhile and then say,"let out your breath and hold . . . . . . breathe,"etc. When the dye is injected in your IV, you will experience only a warm feeling sort of down the center of your body. It's no big deal. It does take several minutes. KEEP YOUR EYES CLOSED from the minute you lie down on the table if you are claustrophobic [at least I think this would be a good idea - I doubt if you would want to experience yourself going into a very large tube]. You must try hard not to move during the procedure. You CAN talk, if you can do so without gesturing! The only painful part, for most people, is the insertion of the IV needle, and this doesn't take long. It's really, really no big deal, if you'll just pretend that you're just on a table, not in a tube. Your experience may be somewhat different, but it should be essentially the same and very harmless. Think of funny things. Hoping to Help ~ billieJ