The effects of wave front distortion in ESWL

Author

Hall, Timothy J. ; Insana, Michael F. ; Soller, Nannette M. ; Rosenthal, Stanton J. ; Apfel, Robert E.

Author_Institution

Dept. of Diagnostic Radiol., Kansas Univ. Med. Center, Kansas City, KS, USA

fYear

1990

fDate

4-7 Dec 1990

Firstpage

1619

Abstract

The effects of phase aberration in extracorporeal shock-wave lithotripsy (ESWL) were investigated. Some patients undergoing these treatments experience focal damage to normal soft tissue in areas away from the intended treatment site. The authors hypothesized that some of the reported soft tissue damage may be caused by mislocation of the focus due to phase aberration of the shock wave in fat layers. This hypothesis was tested by measuring acoustic pressure distributions under four propagational conditions involving the type of medium and type of aberrating layer. Shock-wave pressure distributions were measured in water and in an attenuating medium. A very durable hydrophone was used and shown to survive more than 6000 shocks. The properties of the attenuating medium, a description of the hydrophone, and the observed effects of phase aberration in shock-wave propagation are reported

Keywords

biomedical ultrasonics; radiation therapy; shock waves; acoustic pressure distributions; attenuating medium properties; durable hydrophone; extracorporeal shock-wave lithotripsy; focal damage; focus mislocation; normal soft tissue; patients; phase aberration; phase aberration effects; propagational conditions; shock-wave propagation; therapeutic ultrasound; wave front distortion; Acoustic distortion; Acoustic measurements; Acoustic testing; Biological tissues; Lithotripsy; Medical treatment; Pressure measurement; Shock waves; Sonar equipment; Underwater acoustics;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171642

Filename

171642