Acoustic reflectometry for an model of a human upper airway using sinusoidal wave packets and the Ware–Aki algorithm

E.R. Vazquez and J.H. Pierluissi

Computer Methods in Biomechanics and Biomedical Engineering, 2014, vol. 17, issue 2, 119-127

Abstract: Acoustic reflectometry is often used for estimating the cross-sectional area of a cylindrical cavity when used in combination with an acoustic pulse. The objective of this research is to sweep a spectral bandwidth from 50 Hz to 10 kHz at steps of 50 Hz, with Gaussian sinusoidal wave packets, and to apply the Ware–Aki algorithm. In practice, not only it is difficult to generate a broad spectral bandwidth, but also robust methods are required to compensate for attenuation in the propagating wave and to eliminate a DC offset component generated in its impulse response. This paper looks at using numerical techniques to compute the impulse response and estimate the cross-sectional area as a function of an increment in the frequency response. Preliminary results show that both simulated and reconstructed cross-sectional areas for an in vitro model of a human upper airway may be estimated with an appropriate resolution, suggesting that this method is suitable for such applications.

Date: 2014
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DOI: 10.1080/10255842.2012.672560

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