Field free line generation for Magnetic Particle Imaging based on the Mirror Rule

A novel approach for the generation of the Field Free Line (FFL) with four circular coils is proposed in this paper. A rule for the generation of FFL with four circular coils called Mirror Rule is established and proved based on Biot-Savart Law. Calculations of the FFL field distribution were performed. The relationships between the coil rotation angle and the field inhomogeneity as well as field efficiency were studied. The Mirror Rule for FFL generation and the calculation results were also testified by FEM simulation using the Maxwell software. Based on the Mirror Rule, MPI using a dual-surface FFL generator is able to avoid the patient rotation and promising for future clinical usage.