It is a Fourier-space method so devices and fields are represented as a sum of spatial harmonics.
2.
Truncating the number of spatial harmonics can also slow convergence and techniques like fast Fourier factorization ( FFF ) should be used.
3.
In MRI, both projections and higher spatial harmonics are sampled by applying spatially-varying magnetic fields; no moving parts are necessary to generate an image.
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