if you panic about not being able to move ie sit up, turn and so on let them know.

they asked me if I am clausterphobic and I told them no I have no problem with small places as long as its only for a few seconds to a minute or two. But if I am in any area where I can't move around then I start panicing.

They said for me the best thing would be the open one, I still would not be able to move around but its not like being in a tube. I lay on a table and the machine moves around at angles that always leaves the left side open completely open. No part of me entered any part of the machine where it was completely covered and my whole body was mri'ed from head to toe. they also had a female technition stand next to me and the table on the left where the two of us could talk. it made a bit of noice and I had to hold perfectly still for a half hour but other then that it went great. I just closed my eyes and listened to my music in my mental safe place and I was done in seconds it seemed.