I agree with @hrhwilliam
The greatest benefit of MRI was they are not radiation. So the damage of ongoing radiation is not present with MRIs.

If you have contrast done that would depend on the type and side affects of the contrast.

I have an ICD/Pacemaker and thus have to have a special MRI done on me but it is possible. I am told the MRI special machine is a lower level power and the PACE Clinic comes in and shuts off my pacing during the MRI.

Some new ICD/Pacemakers and their wires are MRI compatible. That is a great improvement. I had my wires put in in 2006. So have some wires that are not MRI compatible.