14 MRI's in one year here. I too had the twitches. I don't know if yours is from the contrast or the MS itself.

I don't think mine was from the contrast, but I do agree with Juday that the temp of the room does play a role, at least for me. And I am usually begging them by the time for contrast to let me sit up so I can pop my back because laying still hurts.

We did discover once when the twitching was bad enough they had to stop the tests that once I sat up and popped my neck, the twitching stopped and we were able to finish the MRI.