Here's a recent thread with some useful info on MRI scans. I was apprehensive about getting a head MRI, but was glad I got it done. It probably took 25 mins. The most useful tips for me were: bring good earplugs; close your eyes before they insert you into the machine; and have a game plan for staying calm (eg, focus on your breathing, think constructive thoughts).

http://neurotalk.psychcentral.com/sh...d.php?t=151292