Magnetic Force Estimation around MRI Magnets
Zhenyu Zhang 1 and Timothy J. Havens 1
MR Science & Technology, GE Healthcare,
Florence, South Carolina, United States
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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