Simulation of a Single-Sided Magnetic Particle Imaging Device with Comsol

For the MPI imaging process, superparamagnetic iron oxide nanoparticles (SPIONs) are used as tracer material. The particles are excited by a sinusoidally varying magnetic field. A field-free point (FFP) is generated by the superposition of two magnetic fields. The FFP is important for the imaging process, since only the SPIONs in the FFP and its direct neighbourhood are essential for the received signal. The single-sided scanner for 1D measurement, consisting of two circular coils, is simulated with COMSOL Multiphysics®. Superimposed to the opposing Direct Current in both coils is the Alternating Current in the inner coil, creating a drive field to move the FFP in one dimension in front of the scanner. Results are realistic in terms of the Magnetic Fields accuracy.