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There is no mentioning of exposure during MRIs. Is there none? I would have thought, CTs as well as MRIs are a problem because of exposure.

Because CT scans and MRI scans are very different technologies....

CT = xray

MRI = Magnetic resonance imaging

There is no exposure in an MRI to radiation. The only danger would be having bits of metal on you or inside you.

Specifically ferromagnetic metal. Surgical implants are largely okay, but there are some neurostimulators that can be a problem.