Show simple item record Qin, J Simmons, WN Sankin, G Zhong, P
dc.coverage.spatial United States 2011-06-21T17:27:44Z 2010-04
dc.identifier.citation J Acoust Soc Am, 2010, 127 (4), pp. 2635 - 2645
dc.description.abstract Using a reflector insert, the original HM-3 lithotripter field at 20 kV was altered significantly with the peak positive pressure (p(+)) in the focal plane increased from 49 to 87 MPa while the -6 dB focal width decreased concomitantly from 11 to 4 mm. Using the original reflector, p(+) of 33 MPa with a -6 dB focal width of 18 mm were measured in a pre-focal plane 15-mm proximal to the lithotripter focus. However, the acoustic pulse energy delivered to a 28-mm diameter area around the lithotripter axis was comparable ( approximately 120 mJ). For all three exposure conditions, similar stone comminution ( approximately 70%) was produced in a mesh holder of 15 mm after 250 shocks. In contrast, stone comminution produced by the modified reflector either in a 15-mm finger cot (45%) or in a 30-mm membrane holder (14%) was significantly reduced from the corresponding values (56% and 26%) produced by the original reflector (no statistically significant differences were observed between the focal and pre-focal planes). These observations suggest that a low-pressure/broad focal width lithotripter field will produce better stone comminution than its counterpart with high-pressure/narrow focal width under clinically relevant in vitro comminution conditions.
dc.format.extent 2635 - 2645
dc.language eng
dc.language.iso en_US en_US
dc.relation.ispartof J Acoust Soc Am
dc.relation.isversionof 10.1121/1.3308409
dc.subject Acoustics
dc.subject Calculi
dc.subject Equipment Design
dc.subject Lithotripsy
dc.subject Materials Testing
dc.subject Models, Theoretical
dc.subject Motion
dc.subject Phantoms, Imaging
dc.subject Pressure
dc.subject Time Factors
dc.subject Transducers, Pressure
dc.title Effect of lithotripter focal width on stone comminution in shock wave lithotripsy.
dc.title.alternative en_US
dc.type Journal Article
dc.description.version Version of Record en_US 2010-4-0 en_US
duke.description.endpage 2645 en_US
duke.description.issue 4 en_US
duke.description.startpage 2635 en_US
duke.description.volume 127 en_US
dc.relation.journal Journal of the Acoustical Society of America en_US
pubs.issue 4
pubs.organisational-group /Duke
pubs.organisational-group /Duke/Pratt School of Engineering
pubs.organisational-group /Duke/Pratt School of Engineering/Biomedical Engineering
pubs.organisational-group /Duke/Pratt School of Engineering/Mechanical Engineering and Materials Science
pubs.publication-status Published
pubs.volume 127
dc.identifier.eissn 1520-8524

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