Document Detail

Pressure waveforms generated by a Dornier extra-corporeal shock-wave lithotripter.
MedLine Citation:
PMID:  3686729     Owner:  NLM     Status:  MEDLINE    
Pressure waveforms in the acoustic field generated by a Dornier (HM3) shock-wave lithotripter have been measured using a bilaminar shielded PVDF membrane hydrophone in water. Using these waveforms, values of the peak-positive (p+) and peak-negative pressure (p-) at various positions in the field have been estimated. At the focus, p+ is 38.6 MPa (standard deviation = 9.0 MPa) and p- is 10.1 MPa (standard deviation = 1.0 MPa) at 20 kV discharge potential and an electrode separation in the range 1.3 to 2.4 mm. The peak-positive pressure is found to fall to 50% (-6 dB level) at about 60 mm either side of the focus on the major axis of the reflector and on a 10 mm radius circle around the focus in the focal plane. A shot-to-shot variation of +/- 25% in p+ is attributed to the inherent variability of the electrical discharge which may result in changes in the exact position and strength of the acoustic field. The results reported are considered to be more accurate than those of previous measurements due to the relatively flat frequency response of this type of hydrophone.
A J Coleman; J E Saunders; R C Preston; D R Bacon
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ultrasound in medicine & biology     Volume:  13     ISSN:  0301-5629     ISO Abbreviation:  Ultrasound Med Biol     Publication Date:  1987 Oct 
Date Detail:
Created Date:  1988-01-11     Completed Date:  1988-01-11     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0410553     Medline TA:  Ultrasound Med Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  651-7     Citation Subset:  IM    
Department of Medical Physics, St. Thomas' Hospital, London.
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MeSH Terms
Lithotripsy / instrumentation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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