Towards Real-Time 4D Field Shift Predictions: Optimizing Fourier-Based Calculations of the Susceptibility Induced Perturbation of the Magnetic Field

J. G. Bouwman¹, J. S. van Gorp², P. R. Seevinck, C. J.G. Bakker

Upspeeding the Fourier-Based calculation of the suceptibility induced field. A higher level of efficiency can be gained if the alias prevention by zero-padding is decoupled from the actual field calculation. This can be done by afterwards estimating this aliasing in a lower resolution. This 'virtual' zero-padding is more than three times faster compared to conventional zero-padding, with only minor accuracy loss. This algorithm is especially applicable in dynamic field shift calculations.