Optimization-based strategy in multiple-channel magnetic resonance systems operating at 128 MHz to reduce radiofrequency heating induced by active implantable medical devices

Abstract

This paper presents a strategy, based on optimization techniques, to design the radiofrequency excitations in a multiple-channel magnetic resonance system operating at 128 MHz, in order to enhance radiofrequency magnetic field 1 homogeneity while reducing the estimated mean induced power deposited (Pind) by an active implantable medical device. Numerical examples on an implanted patient with a generic implant in different locations of a deep brain stimulator undergoing head/brain imaging are presented. Results from these examples show that more degrees of freedom (number of channels) can provide reduced induced deposited power while maintaining a high homogeneity.