Magnetic Force Estimation around MRI Magnets

Magnetic forces around MRIs have long been a major concern for operator and patient safety. Due to the difficulty to calculate exact forces, the consensus of the industry is to provide a quantity which represents a good estimation of magnetic forces. This quantity has been included in IEC 60601-2-33. However, the mathematical definition of this quantity has been discussed recently where two suggestions are presented. In this paper, we make an effort to clarify the situation by demonstrating a very simple derivation for one expression and proving that the other expression does not hold in general.

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