Diffraction Artefacts and their Removal
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.
KeywordsGlycerine Attenuation Acoustics Hydrophone
Unable to display preview. Download preview PDF.
- 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
- 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
- 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
- Hutchins, L. and Leeman, S., 1981, Tissue parameter measurement and imaging, in: “Acoustical Imaging 11”, J.P. Powers (ed), Plenun, New York.Google Scholar
- Leeman, S., Leeks, R., and Sutton, P., 1979, Analysis of pulse-echo ultrasonic images, Les Collogues de l’INSERM, 88:35.Google Scholar