Asymmetric cancellation coil array for surface receiving coils in open-sided FFL MPI

Magnetic particle imaging (MPI), as an emerging non-invasive molecular imaging technology, utilizes the nonlinear magnetic response properties of superparamagnetic iron oxide nanoparticles for imaging. Compared to body coils, surface coils provide higher filling factor, which is promising to enhance the receiving sensitivity. The field-free line MPI (FFL MPI) is rotated at multiple angles for reconstructing particle concentration images. Single cancellation coil for surface coil may be reduced in accuracy at different angles due to imperfections in the magnetic field or mechanical errors. In this paper we design an asymmetric cancellation array based on an open-sided FFL MPI system for improving the cancellation failure problem at different angles. The results show that the array cancellation is superior to the individual cancellation.