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J Sign Process Syst DOI 10.1007/s11265-009-0435-3

Summary: J Sign Process Syst
DOI 10.1007/s11265-009-0435-3
Localizing Lung Sounds: Eigen Basis Decomposition
for Localizing Sources Within a Circular Array of Sensors
S. M. A. Salehin Thushara D. Abhayapala
Received: 28 May 2009 / Revised: 25 October 2009 / Accepted: 9 November 2009
2009 Springer Science + Business Media, LLC. Manufactured in The United States
Abstract Lung disorders or injury can result in changes
in the production of lung sounds both spectrally and
regionally. Localizing these lung sounds can provide
information to the extent and location of the disorder.
Difference in arrival times at a set of sensors and trian-
gulation were previously proposed for acoustic imaging
of the chest. We propose two algorithms for acoustic
imaging using a set of eigen basis functions of the
Helmholtz wave equation. These algorithms remove
the sensor location contribution from the multi sensor
recordings using either an orthogonality property or
a least squares based estimation after which a spa-
tial minimum variance (MV) spectrum is applied to


Source: Abhayapala, Thushara D. - Department of Information Engineering, Australian National University


Collections: Computer Technologies and Information Sciences