Ultrasound pulse-echo measurements on rough surfaces with linear array transducers

Sidsel M. N. Sjøj, Esther N. Blanco, Jens E. Wilhjelm, Henrik Jensen, Martin C. Hemmsen, Jørgen Arendt Jensen

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Abstract

The echo from planar surfaces with rms roughness, Rq, in the range from 0-155 μm was measured with a clinical linear array transducer at different angles of incidence at 6 MHz and 12 MHz. The echo-pulse from the surfaces was isolated with an equal sized window and the power of the echo-pulse was calculated. The power of the echo from the smooth surface (Rq = 0) is highly angle-dependent due to a high degree of specular reflection. Within the angular range considered here, -10° to 10°, the variation spans a range of 18 dB at both 6 MHz and 12 MHz. When roughness increases, the angle-dependence decreases, as the echo process gradually changes from pure reflection to being predominantly governed by backscattering. The power of the echoes from the two roughest surfaces (Rq = 115 μm and 155 μm) are largely independent of angle at both 6 MHz and 12 MHz with a variation of 2 dB in the angular range from -10° to 10°. The least rough surfaces (Rq = 32 μm and 89 μm) have responses in between with a higher degree of angle-dependence at 6 MHz than at 12 MHz.
Original languageEnglish
Title of host publicationProceedings of the International Congress on Ultrasonics
PublisherAmerican Institute of Physics
Publication date2012
Pages211-214
DOIs
Publication statusPublished - 2012
EventInternational Congress on Ultrasonics - University of Gdansk, Gdansk, Poland
Duration: 5 Sep 20118 Sep 2011
http://icu2011.ug.edu.pl

Conference

ConferenceInternational Congress on Ultrasonics
LocationUniversity of Gdansk
CountryPoland
CityGdansk
Period05/09/201108/09/2011
Internet address
SeriesAip Conference Proceedings
Volume1433
ISSN0094-243X

Keywords

  • Ultrasound
  • Linear array transducer
  • Surface roughness
  • Obligue interface

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