Medical-Hypotheses: In human brains, there are a lot of macroscopic (∼100nm) magnetite
granules. Exposure of the patient's head in high strength magnetic
fields could lead to penetrance of those particles into brain neurons
and their staying there for a long period. That conclusion is the
consequence of calculations based on the equations describing the
dynamics of those particles under the action of ponderomotive magnetic,
elastic and viscous forces. The role of iron in brain metabolism is not
conclusively clear but there is evidence of the connection between
excess iron and neurodegenerative diseases. In this regard, it's considered necessary to look more carefully at the matter of safety for brain
magnetic resonance imaging.
