Simulation of ultrasonic imaging with linear arrays in causal absorptive media

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Berkhoff, A.P. and Thijssen, J.M. and Homan, R.J.F. (1996) Simulation of ultrasonic imaging with linear arrays in causal absorptive media. Ultrasound in Medicine and Biology, 22 (2). pp. 245-259. ISSN 0301-5629

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Abstract:Rigorous and efficient numerical methods are presented for simulation of acoustic propagation in a medium where the absorption is described by relaxation processes. It is shown how FFT-based algorithms can be used to simulate ultrasound images in pulse-echo mode. General expressions are obtained for the complex wavenumber in a relaxing medium. A fit to measurements in biological media shows the appropriateness of the model. The wavenumber is applied to three FFT-based extrapolation operators, which are implemented in a weak form to reduce spatial aliasing. The influence of the absorptive medium on the quality of images obtained with a linear array transducer is demonstrated. It is shown that, for moderately absorbing media, the absorption has a large influence on the images, whereas the dispersion has a negligible effect on the images.

Item Type:Article
Copyright:© 1996 World Federation for Ultrasound in Medicine & Biology
Link to this item:http://purl.utwente.nl/publications/64776
Official URL:http://dx.doi.org/10.1016/0301-5629(95)02034-9
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