Hi Laura,
I am pretty sure GAG (Gadolinium) is the only contrast media they use with MRI's. It is injected into the arm, after they take a few sequence pictures first, without the dye.

They really should wait at least 10 minutes before starting any more sequences to give the GAD a chance to get where it should be. Some don't do that. There is an MRI Protocol they should follow, some radiologists/doctors don't use the new protocol. It is specific for MS scanning.
Lady