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Diffraction Artefacts and their Removal

  • E. T. Costa
  • S. Leeman
Part of the Acoustical Imaging book series (ACIM, volume 17)

Abstract

Gore and Leeman (1977) verified experimentally for the medical ultrasound case, in the context of the ‘replica pulse’ formulation of Freedman (1961), that the transient pressure field produced by a piston-like transducer can be described as a sum of two major components: ‘direct’ and ‘edge’ waves (Weight and Hayman, 1978). The edge waves are produced by the periphery of the transducer and are the cause of the diffraction effects observed in many measurement and calibration schemes based on techniques using small hydrophones to probe pulsed ultrasound fields.

Keywords

Amplitude Spectrum Edge Wave Acoustical Image Reflectivity Function Ultrasound Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Costa, E.T., Leeman, S., Richardson, P.A.C., and Seggie, D.A., 1986, Measurement and calibration of transducer fields, in: “Proceed ings of The Institute of Acoustics”, vol. 8, part 2, R. Lawrence (ed.), The Institute of Acoustics, Edimburgh.Google Scholar
  2. Costa, E.T., Leeman, S., and Hoddinott, J.C., 1987, Overcoming the ultrasound diffraction artefact. II. Attenuation estimation, characteristic impedance and nonlinear propagation, Revista Brasileira de Engenharia, Caderno de Engenharia Biomedica, 4(1):47.Google Scholar
  3. Freedman, A., 1961, PhD Thesis (University of London), released as an Establishment Report entitled ‘The formation of acoustic echoes in fluids’ by the Admiralty Underwater Weapons Establishment in 1962, Portland, UK.Google Scholar
  4. Gore, J.C., and Leeman, S., 1977, Echo structure in medical ultrasound pulse-echo scanning, Phys. Med. Biol., 22(3):431.CrossRefGoogle Scholar
  5. Hutchins, L. and Leeman, S., 1981, Tissue parameter measurement and imaging, in: “Acoustical Imaging 11”, J.P. Powers (ed), Plenun, New York.Google Scholar
  6. Leeman, S., Leeks, R., and Sutton, P., 1979, Analysis of pulse-echo ultrasonic images, Les Collogues de l’INSERM, 88:35.Google Scholar
  7. Weight, J.P., and Hayman, J., 1978, Observations of the propagation of very short pulses and their reflection by small targets, J. Acoust. Soc. Am., 62(2):396.ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • E. T. Costa
    • 1
    • 2
  • S. Leeman
    • 1
  1. 1.King’s College School of Medicine and Dentistry, Department of Medical Engineering and PhysicsDulwich HospitalLondonUK
  2. 2.Department of Biomedical Engineering, Biomedical Engineering CenterUNICAMPCampinasBrazil

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