NDLI: Emboli detection and discrimination using harmonics

Content Provider	IEEE Xplore Digital Library
Author	Palanchon, P. Meeder, H. Klein, J. Bom, N. de Jong, N.
Copyright Year	2000
Description	Author affiliation: Dept. of Cardiology & Exp. Echocardiology, Erasmus Univ., Rotterdam, Netherlands (Palanchon, P.)
Abstract	The characterization of gaseous emboli is of high interest for clinical decision making after surgery. In this study, a new approach using the nonlinear behavior of gaseous emboli is presented. An in-vitro set-up was developed to generate air bubbles of uniform sizes, with diameter ranging from 19 /spl mu/m to 200 /spl mu/m to simulate gaseous emboli. These bubbles were characterized using low frequency transducers (130 kHz and 250 kHz) at moderate acoustic pressures (from 30 kPa to 55 kPa peak-to-peak). The use of a 130 kHz transducer together with a 250 kHz transducer allows the detection of a wide range of bubble sizes. Bubble diameters ranging from 19 /spl mu/m to 30 /spl mu/m and from 35 /spl mu/m to 62 /spl mu/m are leading to second harmonic emissions while larger bubbles responded only linearly. The production of a fourth or a fifth harmonic can be correlated to the presence of bubbles of resonance size. The theoretical model showed good agreement with experimental results.
Starting Page	1497
Ending Page	1500
File Size	309920
Page Count	4
File Format	PDF
ISBN	0780363655
ISSN	10510117
DOI	10.1109/ULTSYM.2000.921607
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-10-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resonance Acoustic signal detection Resonant frequency Surgery Acoustic transducers Biomedical transducers Differential equations Cardiology In vitro Acoustic emission
Content Type	Text
Resource Type	Article

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