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- W3100540060 abstract "Wavefield focusing is often achieved by time-reversal mirrors, which are typically derived from closed-boundary integral representations. In heterogeneous media, time-reversal focusing theoretically involves both in- and output signals that are infinite in time and where the resulting waves propagate through the entire medium. Recently, new integral representations have been derived for single-sided wavefield focusing. Although the required input signals for this approach are finite in time, the output signals are not and, similarly to time-reversal mirroring, the waves propagate through the entire medium. Here, an alternative solution for double-sided wavefield focusing is derived. In this solution, based on a new integral representation where both in- and output signals are finite in time, the energy of the waves propagate in the layer embedding the focal point is smaller than with time-reversal focusing. This approach has therefore the potential to reduce spatial and temporal exposure in wavefield focusing experiments, as well as to aid to synthetic wavefield focusing for imaging and inversion. We explore the potential of the new method with numerical experiments involving a simplified head model consisting of a skull enclosing a brain." @default.
- W3100540060 created "2020-11-23" @default.
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- W3100540060 date "2019-06-01" @default.
- W3100540060 modified "2023-09-26" @default.
- W3100540060 title "Wavefield finite time focusing with reduced spatial exposure" @default.
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- W3100540060 doi "https://doi.org/10.1121/1.5110716" @default.
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