Eigen matrix approach in coupled-circuit numerical simulation of eddy currents in MRI systems

In coupled-circuit simulation of eddy currents, system of differential equations is solved to get eddy currents transient responses in different domains at different locations. It is desirable to improve computational efficiency whenever possible. Implementing Eigen matrix techniques to solve this system of equations removes singularity problems totally and reduces calculation time to a large level. We have implemented this approach to analyze eddy currents for both open and large closed-bore MRI systems. We have also conducted FID measurement of eddy fields by NMR probe to verify our approach. We have found good agreement between simulation and experiment.

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