Controlled Ultrasound Tissue Erosion: the Role of Dynamic Interaction Between Insonation and Microbubble Activity

Overview

Journal J Acoust Soc Am

Publisher American Institute of Physics

Specialty Otorhinolaryngology

Date 2005 Feb 12

PMID 15704435

Citations 76

Authors

Zhen Xu

J Brian Fowlkes

Edward D Rothman

Albert M Levin

Charles A Cain

Affiliations

Soon will be listed here.

Abstract

Previous studies showed that ultrasound can mechanically remove tissue in a localized, controlled manner. Moreover, enhanced acoustic backscatter is highly correlated with the erosion process. "Initiation" and "extinction" of this highly backscattering environment were studied in this paper. The relationship between initiation and erosion, variability of initiation and extinction, and effects of pulse intensity and gas saturation on time to initiation (initiation delay time) were investigated. A 788-kHz single-element transducer was used. Multiple pulses at a 3-cycle pulse duration and a 20-kHz pulse repetition frequency were applied. I(SPPA) values between 1000 and 9000 W/cm2 and gas saturation ranges of 24%-28%, 39%-49%, and 77%-81% were tested. Results show the following: (1) without initiation, erosion was never observed; (2) initiation and extinction of the highly backscattering environment were stochastic in nature and dependent on acoustic parameters; (3) initiation delay times were shorter with higher intensity and higher gas saturation (e.g., the mean initiation delay time was 66.9 s at I(SPPA) of 4000 W/cm2 and 3.6 ms at I(SPPA) of 9000 W/cm2); and (4) once initiated by high-intensity pulses, the highly backscattering environment and erosion can be sustained using a significantly lower intensity than that required to initiate the process.

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