Abstract:

Magnetic Particle Imaging (MPI) is a new tomographic imaging technique based on magnetization of ferromagnetic nano-particles. Magnetic fields of different strengths and frequencies generate and move a field free point (FFP) over the field of view, inducing a signal of the magnetic particles, if present. The magnetic fields induce current densities of high amplitude in the patients body and deposit an amount of power that might lead to painful warming in the patients periphery. Based on the specifications of the MPI system, an optimized coil configuration is suggested here, reducing high peak values of current densities and specific absorption rate (SAR), by running the field generating coils of different radius with optimized currents. The results presented here are based on numerical field calculations with a simple cylindrical model, used for the optimization procedure, and the Visible Man data-set, for evaluating the optimization results.