Hi ! I had one of these done , and they saw nothing 😑 basically you go into the tube feet first , and I would say you ' re in as far as your chest or so , so at least your head is out ! My arms were left at my sides , but I think you could have them laying on your stomach if you wanted . The contrast is injected through IV and it starts to make you feel warm . Like all of a sudden I felt like I really really needed to go pee , and then it passed . Not sure what the reasoning behind that is , but I know it ' s common ! It took about 3045 minutes I believe , the worst part was just listening to the loud sounds . They give you ear plugs but the darn thing is so noisy ! In all its totally painless besides the IV , I have the worst veins so that ' s always a struggle for me , and it ' s just a good time to practice your meditation !