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Abstract #4345

Simple, Accurate and Efficient Multilayer Integral Method for Eddy Current Simulation in Thin Volumes of Arbitrary Geometry Produced by MRI Gradient Coils

Hector Sanchez Lopez1, Fabio Freschi2, Adnan Trakic1, Elliot Smith1, Jeremy Herbert1, Miguel Fuentes1, Stephen Wilson1, Limei Liu1, Maurizio Repetto2, Stuart Crozier1

1ITEE, The University of Queensland, Brisbane, QLD, Australia; 2Department of Energy, Politecnico di Torino, Torino, Italy

We present a new accurate and efficient eddy current simulation method capable of calculating induced currents in finite thickness conducting volumes of arbitrary geometry induced by arbitrary arrangements of gradient coils. The method has been experimentally validated using a z-gradient coil and its performance tested against COMSOL and the Fourier Network method. We present an example to demonstrate the capabilities of the method in terms of predicting the induced currents, power losses and pre-emphasis simulations using the excited eigenvalue corresponding to the surrounding structure. The method is accurate and fast enough to be performed in a laptop Intel corei7 CPU.

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Keywords

accurate accurately acoustic acquisition amplitude analytical arbitrary assumed asymmetries axial axis built calculating capable card characteristic characteristics closely coil coils computer computing condition conditioning conditions conducting constant containing controlled convolution core coupled coupling cryostat curves cylinder cylindrical decay density diffusion dimension discrete discretized divided domain driven duration eddy edges efficient eigenvalue electrical electromagnetic emphasis energy enforced enough equation evaluate example excited expected experimentally exponential fast field filter finite flat form frequency functions geometry gradient grows guarantee harmonic heating hector immerse induce induced inductance inductive infinity instruments integral journal known layer layers linear loop loss meas measured mesh much multilayer noise novel numerical numerically overall performance position power predicting produced pulse radius recorded reduced residual resistively respectively rise scanner simple simulation sinusoidal skin smaller smallest smith smooth solution solved source stability stable stokes structure structures subset surface surrounding system tailor terms theorem thin translate trapezoidal triangles turn unshielded validated varying vector volumes