Accession Number : AD0752172

Title :   Ultrasonic Detection of Bubbles with Doppler Flow Transducers.

Descriptive Note : Research paper,

Corporate Author : DEFENCE AND CIVIL INST OF ENVIRONMENTAL MEDICINE DOWNSVIEW (ONTARIO)

Personal Author(s) : Nishi,R. Y.

Report Date : 20 JUL 1971

Pagination or Media Count : 8

Abstract : Doppler blood-flow transducers have been used to detect gas bubbles in the circulatory system during hyperbaric decompression. The paper describes briefly the theoretical acoustic scattering properties of bubbles and then describes various experimental procedures which have been used to determine the properties of these flow transducers. The capabilities and limitations of the transducers for the detection of bubbles were investigated by studying the scattering from both solid objects and air bubbles moving through the acoustic field. In vivo experiments indicate that it would be difficult to obtain any correlation between the output of these transducers and bubble size. (Author)

Descriptors :   (*DECOMPRESSION SICKNESS, GAS EMBOLISM), (*GAS EMBOLISM, DOPPLER SYSTEMS), BLOOD, GAS DETECTORS, ACOUSTIC PROPERTIES, TRANSDUCERS, DETECTORS

Subject Categories : Biomedical Instrumentation and Bioengineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE