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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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Local SAR

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What is the restriction on SAR (peak in any one kilogram) for scans greater than 30 mins, for the head? the trunk? the limbs?

Head: 2 Wkg-1.
Trunk: 4 Wkg-1.
Limbs: 6 Wkg-1.
The restrictions on the maximum local temperature are 38 °C, 39 °C and 40 °C respectively.

Further reading on this topic:
Books: MHRA Guidelines p30, MRI From Picture to Proton p191

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