Magnetic Forces on Medical Implants

Medical implants raise important safety concerns for patients receiving MRI due to the forces and torques acting on the implants during patient scanning or entry. The implant can be deemed MRI safe if the magnetic forces and torques are less than the forces due to gravity. Using a representative contour plot of B|grad B| for a 1.5 T magnet design we determine safe zones which also depend on the material susceptibility. We show that if the implant is deemed safe for static forces it will also be safe for static torques.

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