Power difference in spectrum of sound radiation before and after break of phantom by piezoelectric extracorporeal shock wave lithotriptor

Hiroshi Kanai, Yun Seok Jang, Noriyoshi Chubachi, Yoshikatsu Tanahashi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This paper investigates the difference in the spectrum of sound radiated before and after the break of a phantom at a focal point of the piezoelectric extracorporeal shock wave lithotriptor (ESWL) in order to identify the break time or to examine whether a calculus exists exactly at the focal point or not. From the preliminary experiments using a piece of chalk as a phantom of a calculus to measure the sound radiated when impact is applied to the chalk by an impact hammer, it is found that the bending vibration component of the vibration is exhibited in the spectrum of sound. However, for small-sized chalk shorter than 3 cm, the peak frequency of the bending vibration is higher than 20 kHz. From the experiments using a piezoeletric ESWL, it is found that there is clear difference in the power spectra among the sound radiated before the break, that radiated just after the break in the breaking process, and that radiated when the chalk does not exist at the focal point of the ESWL. These characteristics will be effective for the examination of the existence of the calculus at the focal point.

Original languageEnglish
Pages (from-to)3159-3161
Number of pages3
JournalJapanese journal of applied physics
Volume33
Issue number5S
DOIs
Publication statusPublished - 1994 May

Keywords

  • Bending vibration
  • Break time
  • Calculus
  • Piezoelectric ESWL
  • Radiated sound

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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