A refined debye model for the dynamic magnetization response of superparamagnetic nanoparticles

Abstract

Magnetic Particle Imaging (MPI) uses ferrofluids based on superparamagnetic iron-oxide nanoparticles (SPIONs) asa tracer, whose induced voltage in the receive coils is the measured signal. Image reconstruction is often done withthe system matrix approach, which needs the signal of a test sample at each position for which the concentrationshould be reconstructed. In a scanner with a three dimensional reconstruction volume, this measurement becomesvery time consuming. Functional parameters such as the temperature might also be reconstructed with a systemmatrix approach but would require additional system matrices to be measured. Simulation models for the ferrofluid’smagnetic behavior might be a solution to this problem, if they are sufficiently fast and precise. Here, we comparethe prediction quality and computational cost of the commonly used Debye model with the new Refined Debyemodel on a viscosity measurement.