[abstract] MEASUREMENT OF AIR BUBBLES IN VIVO WITH RESONANT FREQUENCY ULTRASOUND.

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[abstract] MEASUREMENT OF AIR BUBBLES IN VIVO WITH RESONANT FREQUENCY ULTRASOUND.

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Title: [abstract] MEASUREMENT OF AIR BUBBLES IN VIVO WITH RESONANT FREQUENCY ULTRASOUND.
Author: Karavolos, A; Powell, MR; Anayiotos, A
Abstract: INTRODUCTION: It would be valuable to have an actual indication of in vivo gas bubble size/density distributions, because the influence of null gravity on decompression sickness incidence appears to be, in part, the result of bubble size/density changes. Currently under development are decompression models using gas bubble size distributions. METHODS: An optical comparison approach was used with a chamber designed to house an anesthetized animal. Animal specimens of mosquito fish, catfish, and salamander were employed because of their relatively clear tissues. They were anesthetized using a 50 perfect by volume solution of benzocaine and diethyl ether. Micro bubbles were manually injected into the specimen 2-3 mm underneath the abdomen. Specimens were placed in a chamber, and gas bubbles were observed under the microscope and sized with a double-frequency, pulsed technique (215 kHz and 2.5 MHz). (Magari et al, Proceedings 1997 IEEE Ultrasonics Symposium, 97CH13118, pp. 1205-1220). See figure on page 14. RESULTS: Data obtained from a series of experiments to date are shown in the figure. The ultrasound system could not detect bubbles under 25 micra (observed optically). The size correlations were very good with R2 values being greater than 0.9995. CONCLUSIONS: Within the size ranges tested to date, the ultrasound double frequency resonance technique is of utility for detecting and sizing gas bubbles in living tissue.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/5202
Date: 2000

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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