Source: Annual Congress 2004 - Lung function technology: beyond the basic test

Abstract

Although machinery acoustical examination methods have been used for a long time already, the problem of examination data accuracy still exists.
We have conducted analysis of more than 5 thousand vesicular resonance spectrograms of healthy persons. Lungs were divided into 22 areas including all lung segments. As a result of considerable research volume width of stable spectral part of healthy lungs was determined (62-250 Hz). Seven bands of spectrometer with width of about 31 Hz were detected within the range. Large spectral level shifts depending on lungs area and impulse coverage during spectral calculation did not allow applying any mathematical methods to spectral shape comparison. In this connection spectra were regulated by binding of the highest peak to zero level. Spectral curves characteristic of each lung area were determined with healthy persons. As a result of the research we managed to minimize errors in spectral curves representation in health lung areas.

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L. I. Kovaleva, Y. V. Kulakov, I. N. Kovaleva (Vladivostok, Russia). Differentiation of vesicular resonance spectrograms. Eur Respir J 2004; 24: Suppl. 48, 2487

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