Document Detail


Pressure waveforms generated by a Dornier extra-corporeal shock-wave lithotripter.
MedLine Citation:
PMID:  3686729     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
A J Coleman; J E Saunders; R C Preston; D R Bacon
Related Documents :
11481559 - Posterior annular strains during discography.
8013679 - An objective assessment of intermittent claudication by near-infrared spectroscopy.
9620179 - Biomechanical analysis of capitate shortening with capitate hamate fusion in the treatm...
10434169 - Factors determining end-expiratory alveolar pressure after cardiac surgery.
23706489 - Proteolysis and biogenic amine buildup in high-pressure treated ovine milk blue-veined ...
1385899 - Intraosseous vertebral body pressures.
1541129 - Spontaneous breathing and total body oxygen consumption in children recovering from ope...
12881159 - Flow resistance over technical anastomoses in relation to the angle of distal end-to-si...
3653969 - Inhibition of muscle sympathetic nerve activity in humans by arginine vasopressin.
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    
Affiliation:
Department of Medical Physics, St. Thomas' Hospital, London.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Acoustics
Humans
Lithotripsy / instrumentation*

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


Previous Document:  Two-dimensional echocardiographic imaging: in vitro comparison of conventional and dynamically focus...
Next Document:  The use of ultrasound by physiotherapists in Britain, 1985.