Abstract
Presently, puls-echo techniques present the main activity in the acoustics group of the Delft University of Technology.
Applications lie in Geophysics, nondestructive testing and medical imaging. The philosophy of the group is based on two principles: a. Incorporation of wave theory (according to the acoustic wave equation) for inhomogeneous media in the physical model of acoustic echo data.
b. Use of linear inverse theory in the digital analysis and processing techniques of RF echo measurements.
With respect to the medical applications, the following projects are of interest:
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1.
Improvement of spatial resolution by means of computerized acoustic focussing, using wave field extrapolation techniques.
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2.
Tissue identification by means of a second-order statistical investigation of focussed data.
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3.
Velocity estimation with the aid of coherency methods and minimum-entropy techniques.
With respect to the medical applications, the following projects are of interest:
-
1.
Improvement of spatial resolution by means of computerized acoustic focussing, using wave field extrapolation techniques.
-
2.
Tissue identification by means of a second-order statistical investigation of focussed data.
-
3.
Velocity estimation with the aid of coherency methods and minimum-entropy techniques.
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3.
Model verification by means of parameter estimation.
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References
Berkhout, A.J. (1980): Seismic migration, imaging of acoustic energy by wave field extrapolation. Elsevier Scientific Publ. Company, Amsterdam.
Berkhout, A.J., Ridder, J. and van der Wal, L.F. (1982): Acoustic imaging by wave field extrapolation, Part 1: Theoretical considerations. In: Acoustical Imaging, Vol. 10, pp. 513–567; Eds. P. Alais and A. Metherell, Plenum, New York.
Ridder, J., Berkhout, A.J. and van der Wal, L.F. (1982): Acoustic imaging by wave field extrapolation, Part 2: Practical aspects. In: Acoustical Imaging, Vol. 10, pp. 513–567; Eds. P. Alais and A. Metherell, Plenum, New York.
Berkhout, A.J. (1981): Wave field extrapolation techniques in seismic migration, a tutorial. Geophysics, Vol. 46, Nr. 12, pp. 1638–1656.
References
Waag, R.C. (1980): Theory and measurements of ultrasonic scattering for tissue characterization. In: Acoustic imaging, Vol. 9, Ed. Wang, Plenum Press, New York.
Nicholas, D. (1979): Ultrasonic diffraction analysis in the investigation of liver disease. British J. Radiol., 52, pp. 949–961.
Mesdag, P.R., Berkhout, A.J. and Ridder, J. (1982): A wave theoretical approach to tissue characterization. Submitted for publication in J. Acoust. Soc. Amer.
References
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The General Linear Inverse Problem: Implications of Surface Waves and Free Oscillations for Earth Structure. Rev. Geophys. Space Phys., Vol. 10, pp. 251–285.
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© 1982 Martinus Nijhoff Publishers, The Hague, Boston, London
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Berkhout, A.J., Mesdag, P.R., de Vries, D., van Riel, P. (1982). Synthetic Focussing in Medical Ultrasound. In: Thijssen, J.M., Nicholas, D. (eds) Ultrasonic Tissue Characterization. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7666-5_18
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DOI: https://doi.org/10.1007/978-94-009-7666-5_18
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