What happens to iron in the body after going into a MRI machine?

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What happens to iron in the body after going into a MRI machine?

In: Physics

Need a little clarification. Do you mean iron that’s in blood? Or iron/metal in the body like bullet fragments, or metal shavings?

Molecular sized iron? Nothing lasting. It feels the magnetic fields and temporarily reacts but goes back to its original state relatively quickly. Most of its neighboring molecules are not iron and don’t feel the magnetic field as much. Any small amount of heat that accumulates is easily dissipated into the largely water-based human body.

Large pieces of iron? Depends. They may attempt to move in the body, reacting to the magnetic fields. They may gain/retain significant heat from the dynamic fields they experience, be unable to dissipate this heat due to the mass of metal and burn a person.

The iron in your body is typically not in its metallic state. It has been reacted with by your body, and so does not behave like a lump of iron does. All of the atoms in your body feel the pull of an MRI machine, and not just the iron. This effect is very small, however, and has no practical effect on you. It is, however, what allows the MRI machine to work.