Abstract:

Magnetic Particle Imaging (MPI) benefits from the non-linear magnetization curve of magnetic nano-particles. Magnetic fields applied in this new imaging modality are of fre- quencies in the kHz-range. Little research has been carried out upon absorbed power and temperature increase caused by time- varying fields in that frequency range. Presented here are tem- perature distributions in a human body model exposed to mag- netic fields of 10 kHz to 100 kHz. A numerical human model has been placed within field generating coils. The finite elements model for the field calculation and the Pennes Bio-heat equation for the temperature distribution with and without perfusion and heat transfer by convection have been used. The results indicate that the absorbed power does lead to local temperature increase but not up to a hazardous level, if certain thresholds for the mag- netic fields are considered.