Design and construction of a toroidal filter coil for a magnetic particle imaging device

Magnetic Particle Imaging (MPI) is a medical imaging method that is based on the non-linear magnetization behaviour of superparamagnetic nanoparticles (SPION). Compared to other imaging technologies MPI provides high sensitivity, fine resolution and is capable of real time imaging. To acquire a suitable signal, a highly pure excitation field is essential. To guarantee the signal purity band pass filters are applied to supress distortions introduced by power aplifiers. The frequency filter performance is strongly affected by the quality factor of the implemented reactive parts. In this paper, the design process of a toroidal inductor is presented.