MRI's are not "standard" for physicals. There are reasons to get an MRI. If he is getting them done it is because they are looking for or monitoring something. If it is for his brain than most likely they're "looking". (and with a brain that addled they would need specialized equipment).
I saw an appropriate meme this morning - "Sending Homan to replace Bovino is like -------- your pants and changing your shirt"