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» MRI Safety

Exposures, limits, safe systems of work. This section explores safety issues in magnetic resonance imaging.

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Static Magnetic Field Limits

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What are the upper limits for the general public, for the static magnetic field? (UK)

General Public:Upper Limit (T)
Without pacemakers0.2
With pacemakers0.5x10-3

For shielded magnets, the 0.2 T line corresponds to the entrance of the magnet bore, therefore it should not be difficult to remain well clear of this field strength. Ensuring that no member of the general public is exposed to more than 0.5 mT means that no member of the general public should enter the Controlled Area.

Further reading on this topic:
Books: MHRA Guidelines p35

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