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- Title
Impedance Modulation by Pulsed Ultrasound.
- Authors
JOSSINET, JACQUES; LAVANDIER, BERNARD; CATHIGNOL, DOMINIQUE
- Abstract
A bstract: The propagation of an acoustic wave in an electrolyte solution produces local and periodic conductivity changes. This acousto-electrical interaction is due to the variations of the parameters controlling ionic conductivity against pressure and temperature. The overall effect is about 10−7% Pa−1 for solutions of physiological ions and is practically independent of the ionic species involved. The bulk compressibility of the medium is responsible for about 47% of the effect, the change in viscosity due to pressure changes is responsible for about 18%, and the changes of ionic mobility against temperature are responsible for about 35%. Detectable impedance changes were produced in the focal zone of a 500-kHz focused transducer using moderate intensity ultrasound (peak pressure < 1 MPa). This technique potentially enables the association of the spatial resolution of pulsed ultrasound and impedance measurement, although technical improvements and feasibility studies are still needed prior to practical applications.
- Publication
Annals of the New York Academy of Sciences, 1999, Vol 873, Issue 1, p396
- ISSN
0077-8923
- Publication type
Article
- DOI
10.1111/j.1749-6632.1999.tb09489.x