Impact of Transfer Function and E-Field Spatial Resolution on AIMD RF-Induced Voltage

This study investigated whether reducing the spatial resolution of measured Transfer Function and simulated tangential E-fields impacts the accuracy of MRI RF-Induced injection voltage modeling for an Active Implantable Medical Device (AIMD) per testing standards. Transfer Function scalars were computed and compared at different spatial resolutions for an implant in 1.5 T and 3 T MRI scanners. For both frequencies, the scalar remained stable for spatial resolutions of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$0.2-1 \text{cm}$</tex>. At 3 T, the Transfer Function scalar was more sensitive to resolution changes, deviating from baseline quicker than 1.5T.