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- W2015301866 abstract "Backpropagating an acoustical field that is measured on a planar surface using angular spectrum decomposition [J. Goodman, Introduction to Fourier Optics (McGraw-Hill, New York, 1968)] can be used to reconstruct a source region or a scattering region. The reconstruction algorithm is inherently monochromatic and hence the range resolution is typically worse than the lateral resolution. In diffraction tomography, the same backpropagation algorithm is used and the summation over views is used to improve the overall resolutions [A. Devaney, Ultrason. Imag. 4, 336–350 (1982)]. In the case of B-scan imaging, the reverse is true. The use of short pulse provides a good range resolution while the lateral resolution is limited by the beamwidth. It is therefore advantageous to combine the wideband approach with the backpropagation. The use of multiple frequencies in backpropagating the acoustical field has shown to improve the range roolution [e.g., T. J. Teo and J. M. Reid, Acoust. Imag. 14, 143–153 (1985)]. The two techniques can therefore be combined by suitably weighting the frequency distribution with the amplitude and phase spectra of a pulse. We will also show the effect of pulse shape on the image reconstructed and range resolution in particular." @default.
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- W2015301866 date "1986-05-01" @default.
- W2015301866 modified "2023-09-24" @default.
- W2015301866 title "The use of frequency weighting in multifrequency holography" @default.
- W2015301866 doi "https://doi.org/10.1121/1.2023236" @default.
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