Hi Angie,
I only had a few MRI's. One set before Avonex for ins approval of drug (but blood work every three months while on it one year.) My liver did not tolerate "A", nor did I. He switched me to Copaxone, no MRI. 4 relapses a year still. Lots of oral steroids over the years prior and in combo with all the DMD's.

Four 1/2 years later a full set of MRI's again with ins change and new Neuro. Some progression, new Neuro stopped "C" after 3 1/2 years on it. I was still badly relapsing on the DMD's. Did 10 days of 1000 mg IVSM.

No DMD's in the next two years, I was not being helped by them. Ins changed again, new Neuro gave me a brain and c-spine MRI in 2007.

New ins again, and new Neuro has not sent me for MRI because I am doing so well on the LDN. That's my story, I hope it answers your question.

I find that when you switch Neuro's they tend to order their own MRI's. For their records?? My new one doesn't believe in them too often. She goes by her exams on me. I think they can tell that way.

Edited to add:
I re-read your question Angie. When in doubt, always call the doctor. He should be told about any new symptoms or old problems you are having. He will decide if you need another MRI, or you could ask for one.