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There's specs for current Medtronic DBS systems (machine configured below certain RF power, 1.5 tesla magnet, specific head coils), as long as you stay within them, it's ok. Boston Sci/St Jude ones are "probably" compatible" but has not had FDA approval for MRIs yet.

I always assumed they run MRI patients through a metal detector first, seems like a sensible precaution to me.

They do, at least the one time I was in one (which was fMRI for a research study.)

There are MRI-safe ICDs now. So they can be designed to avoid heating and mechanical displacement in MRIs. For ones not designed for this, such as yours apparently, it can be deadly though.