I had an MRI several years ago. I had heard horror stories, but I found the tube cozy and relaxing.
I have a fear of heights. Of enclosed spaces, not so much.
I always fall asleep bin the magnet tube.
The loud noise is a lulu by.
Several years ago a Dr. asked me if I had a fear of heights. I answered "yes", and after a few seconds thinking back to the tree-climbing days of my youth I added ... "adult onset".
We both got a good laugh out of that.