We present a method to include small-scale inhomogeneities in the high-order acoustic finite difference and pseudo-spectral methods while retaining their sparse grids. We define the structures on auxiliary dense grids and use the points as the secondary sources in the Born approximation. We use Hicks’ interpolation to include the points in the finite difference or pseudo-spectral grids. The method provides accurate estimation of the wavefield scattered from a small circular structure in 2D.


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