That would be outstanding. Perhaps putting the recording in the control room of the MRI facility and having the wires run into the room, two stereo microphones on either side of the machine would be ideal, but that may not be feasible. Even a basis minidisc recorder with a small stereo microphone attached would be good enough raw material for me! :)
Your comment about the headphones explains why the headphones they put on me were attached to plastic tubing that ran to the control room...just the like good ol' fashion communication system in boats and submarines! I think a mic would be fine outside the machine. When I had my MRI, there were plenty of objects in the room around the machine...I just couldn't have any metallic objects on my body inside it. They were really concerned about that. I was shot in the leg by a .357 magnum when I was a teenager, which left several pieces of soft lead in my leg, which were removed surgically. That was enough for them to open their manual and search for data on that caliber of gun, types of bullets, copper vs. lead shells, etc.