Bubbles trapped at the coupling surface of the treatment head significantly reduce acoustic energy delivered in shock wave lithotripsy

Yuri A. Pishchalnikov, James A. McAteer, Irina V. Pishchalnikova, Spencer Beard, James Williams, Michael R. Bailey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The coupling efficiency of a "dry head" electromagnetic lithotripter (Dornier Compact Delta) was studied in vitro. A fiber-optic probe hydrophone (FOPH-500) was positioned in a test tank filled with degassed water. The tank was coupled through a semi-transparent latex membrane to the water-filled cushion of the lithotripter head, so that bubbles (air pockets) trapped between the two coupling surfaces could be easily observed and photographed. When gel was applied to both the latex membrane and the water cushion, numerous bubbles (some several millimeters in diameter) could be seen at the coupling interface. Hydrophone measurements in the geometric focus of the lithotripter showed that the acoustic pressure could be two times lower when bubbles were present than when they were manually removed. In our in vitro design, trapped bubbles could be easily observed and therefore removed from the acoustic path. However, during patient treatment with a dry-head lithotripter one cannot see whether bubbles are trapped against the skin. This study provides a demonstration of the dramatic effect that trapped bubbles can have on the amount of acoustic energy actually delivered for treatment.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages643-647
Number of pages5
Volume829
DOIs
StatePublished - May 8 2006
EventTHERAPEUTIC ULTRASOUND: 5th International Symposium on Therapeutic Ultrasound - Boston, MA, United States
Duration: Oct 27 2005Oct 29 2005

Other

OtherTHERAPEUTIC ULTRASOUND: 5th International Symposium on Therapeutic Ultrasound
CountryUnited States
CityBoston, MA
Period10/27/0510/29/05

Fingerprint

shock waves
bubbles
acoustics
cushions
hydrophones
latex
energy
water
membranes
fiber optics
gels
electromagnetism
probes
air

Keywords

  • Coupling gel
  • Shielding by trapped bubbles
  • Shock wave lithotripsy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Pishchalnikov, Y. A., McAteer, J. A., Pishchalnikova, I. V., Beard, S., Williams, J., & Bailey, M. R. (2006). Bubbles trapped at the coupling surface of the treatment head significantly reduce acoustic energy delivered in shock wave lithotripsy. In AIP Conference Proceedings (Vol. 829, pp. 643-647) https://doi.org/10.1063/1.2205553

Bubbles trapped at the coupling surface of the treatment head significantly reduce acoustic energy delivered in shock wave lithotripsy. / Pishchalnikov, Yuri A.; McAteer, James A.; Pishchalnikova, Irina V.; Beard, Spencer; Williams, James; Bailey, Michael R.

AIP Conference Proceedings. Vol. 829 2006. p. 643-647.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Pishchalnikov, YA, McAteer, JA, Pishchalnikova, IV, Beard, S, Williams, J & Bailey, MR 2006, Bubbles trapped at the coupling surface of the treatment head significantly reduce acoustic energy delivered in shock wave lithotripsy. in AIP Conference Proceedings. vol. 829, pp. 643-647, THERAPEUTIC ULTRASOUND: 5th International Symposium on Therapeutic Ultrasound, Boston, MA, United States, 10/27/05. https://doi.org/10.1063/1.2205553
Pishchalnikov YA, McAteer JA, Pishchalnikova IV, Beard S, Williams J, Bailey MR. Bubbles trapped at the coupling surface of the treatment head significantly reduce acoustic energy delivered in shock wave lithotripsy. In AIP Conference Proceedings. Vol. 829. 2006. p. 643-647 https://doi.org/10.1063/1.2205553
Pishchalnikov, Yuri A. ; McAteer, James A. ; Pishchalnikova, Irina V. ; Beard, Spencer ; Williams, James ; Bailey, Michael R. / Bubbles trapped at the coupling surface of the treatment head significantly reduce acoustic energy delivered in shock wave lithotripsy. AIP Conference Proceedings. Vol. 829 2006. pp. 643-647
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