Simulation of ultrasonic imaging with linear arrays in causal absorptive media

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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