Numerical Evaluation of Induced Field by Body-Motion Around High Field MRI Magnets: A Case Study with an Implanted Pacemaker

Hua Wang¹, Feng Liu¹, Bing Keong Li¹, Adnan Trakic¹, Stuart Crozier¹

In MRI, patients and occupational workers can be exposed to strong gradients of the static magnetic fields. Body motion through these static field gradients can produce substantial currents within tissue. Numerical evaluations of induced fields in a tissue-equivalent model with/without an implanted pacemaker model are presented to improve our understanding of the interactions. Lorenz forces were computed based on the induced electric current and charge. The methodology presented in this work can be extrapolated to high static field strengths to evaluate motion effect for a variety of body orientations, velocities and implanted devices.