Safety Analysis of Implant Titanium Alloy Leads Under 3.0 Tesla Magnetic Resonance Imaging Combined Fields

Performing magnetic resonance imaging (MRI) scans in patients with Active Implantable Medical Devices (AIMDs) can cause a range of safety issues. Here we use finite elements method (FEM) simulation to establish a combined electromagnetic field environment in 3T MRI systems, which include the main magnetic field, the gradient magnetic field and the radio frequency (RF) magnetic field. The safety of the implanted titanium alloy leads in the combined field of the magnetic resonance system is analyzed in the simulated electromagnetic environment. The simulation results show that the force of the titanium alloy lead induced by the static magnetic field and the gradient magnetic field is within an acceptable range, and in the RF field, the electromagnetic field distribution in the vicinity of the lead is significantly changed due to the antenna effect. By increasing the radius of the lead, the RF energy absorbed by the wire tip can be reduced to a certain extent, and the electric field mode strength near the tip can be lowered.