Hiya, Joyce, a lot of people I've known do take a little somthing before and MRI. It doesn't bother me enough to need to do it myself, but I admit that I prefer to do it at night, right before bed, and I have to take the anti-spaz meds to hold still.
I also take some CDs along and mentally attend Les Mis or Phantom, or Rent while I'm in there. Too bad there is no good soundtrack for a major demolition project because that's what the MRI sounds like!
Just take it easy and it will end, ole girl. Have fun with your nice, clean doggy!