Quantitative spectral/spatial analysis of phased array coil in magnetic resonance imaging based on method of moment

Abstract

A new approach for analysis of RF coils in magnetic resonance (MR) experiments is reported. Instead of assuming current distribution in conventional quasi-static algorithm, this approach transforms the coil geometry into an equivalent circuit for complex current calculation. Self and mutual inductance are taken into consideration. Frequency responses of RF coils and transverse magnetic field (B1) maps can be simulated. This approach is especially efficient for phased array coil design for its small matrix size when implemented on computers. Experiments on both single surface coil and phased array coils are consistent with simulation results. Index Terms-Magnetic resonance, method of moment, phased array coil, RF coil.

Analysing radio-frequency coil arrays in high-field magnetic resonance imaging by the combined field integral equation method

“…On the other hand, methods based on Green's function and the surface equivalent theorem formulate the problem on surfaces (Harrington 1993), which render much fewer unknowns to solve. In Lin et al (1999), the method of moments (MoM) has been applied to simulate the B 1 field of RF coil arrays in free space. Although the incorporation of the human body is not mandatory at low field, it is definitely required at high field due to the strong coil-body coupling.…”