Fig. 3.
(A) The grid interpolation approach for fast valuation of the incident E-field. We employ a cubic grid with 9 million points as the interpolation is extremely fast. The E-field magnitude is shown at different cross-sectional planes. (B) Moving the coil from point a to point b (top row, transformation matrix Tc) is equivalent of the subject’s head moving in the opposite direction (bottom row, transformation matrix Tc−1). (C) The resulting E-field from interpolation approach is shown on the WM surface (bottom row) along with the full BEM-FMM ground truth result (top row).