Abstract: Subsurface sensing and imaging problems arise in a variety of contexts: underground, underwater, inside the human body, and inside a cell or a collection of cells. All of these problems require reconstruction of internal structures or functions from a highly distorted probe or wave sampled outside of an obscuring surface. There is an emerging common framework of physics-based signal processing which will allow progress in any of these areas to be applied to create advances in the other areas. The recognition of the essential similarity of these problems and the development of the common framework is a key to the next generation of environmental and biomedical imaging systems. !36
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