My neuro says she likes to have 3 MRIs--brain, cervical and thoracic, I think were the ones she mentioned.

I haven't had these done yet though I've been with this neuro a couple of years now. If I were interested in one of the MS therapies, I'd definitely have the MRIs but as of now I'm postponing them indefinitely--mainly just because getting MRIs isn't very entertaining, and getting there and back can be tiring. But I can see why you'd want to get the spinal MRI.