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MRI machines do explode and send shrapnel everywhere. Emergency stopping them causes the helium that's trapped in the part that rotates the magnets to become a gas, then expand as the magnets superheat. In some cases, this causes an understandable explosion.
Seriously happened once already this year https://healthimaging.com/topics/medical-imaging/magnetic-resonance-imaging-mri/mri-explosion-leaves-3-injured-including-2-hospital-staffers , the cop is lucky.
The magnet doesn't rotate like a CT. But you're right that there is a vessel with supercooled helium.
But that's the first time i've ever heard of this... It's a philips, makes sense.
They're supposed to be designed such that it is impossible. Looks like there was a major recall. Because again, that's something that should never happen.