Some New Approaches To Inverse Scattering
R.H.T. Bates, Richard A. Minard · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1983
Despite its popularity (due to its simplicity) the Born/Rayleigh-Gans approximation has a tiny range of practical applicability. WKB (called LSJWKB here) transformation of the wave equation suggests an apparently widely valid monochromatic quasi-Born inverse scattering approximation, which promises to lead to images which, while suffering from irreducible geometric distortion, exhibit faithful contrast. Virtually all monochromatic images are degraded by speckle artefacts, which can be inhibited by averaging over a wide band of frequencies. We claim here that our recently developed coherent shift-and-add processing of ultra-sonic scattering data provides support for our new interpretation of the LSJWKB-transformed wave equation. Experimental results, demonstrating image enhancement simultaneously with speckle reduction, are presented.