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MRI Forum: Radio frequency exposure
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  Category:  Basics and Physics
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Tue. 3 May.05,
21:21
Radio frequency exposure
Is there a relationship between SAR and Gauss? A conversion formula? Also, is the EMF exposure reduced by the square or the cube of the distance?

Chris Gardener

Wed. 11 May.05,
22:43
If the magnetic field strength (measured in Tesla/Gauss) increases, also the SAR increases. For fields up to 3.0 Tesla, the value of SAR is proportional to the square of the field but at high fields the body becomes increasingly conductive, with the need of increased RF power. The EMF exposure is reduced by the square of the distance.

Hope this will help
Chris

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