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Abstract #0043

Fast Fourier transform-based susceptibility-to-B0 calculation without aliasing artifacts

Lee Seungkyun1,2

1Center for Neuroscience Imaging Research (CNIR), Institute for Basic Science (IBS), Suwon, Korea, Republic of, 2Department of Biomedical Engineering, Sungkyunkwan University (SKKU), Suwon, Korea, Republic of

In the Fourier transform-based susceptibility-to-B0 calculation, the dipolar field kernel (1/3-kz2/k2) is discretely sampled in the k-space, which leads to aliasing artifacts in the spatial domain. We show that calculating and discretizing the dipolar field kernel in the spatial domain, before the Fourier transform, can effectively reduce the aliasing effect without resorting to large zero-filled buffers. In particular, aliasing is eliminated if the spatial-domain grid size is larger than the combined dimensions of the susceptibility source and the B0 target regions. The new method can accelerate repeated calculations of susceptibility-induced B0 fields.

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