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.
