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Erschienen in:
2019 | OriginalPaper | Buchkapitel
Low- and High-Speed Arrivals Decomposition in 10–19 kHz Transmission Sounding of Human Lungs
verfasst von : Vladimir Korenbaum, Anton Shiryaev, Anatoly Kostiv, Maria Safronova
Erschienen in: World Congress on Medical Physics and Biomedical Engineering 2018
Verlag: Springer Singapore
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Abstract
The possibility of decomposition of received signals into high-speed (150–1000 m/s) and low-speed components (50–150 m/s) previously revealed is verified in independent sample. Four types of the ratio between the amplitudes of high- and low-speed arrivals and their changes depending on air-filling of lungs (inspiration/exhalation) are found. Only one of these types, representing predominance of amplitudes of high-speed arrivals, both during inspiration and exhalation is found in one elderly patient with a long-term course of hormone-dependent asthma, but not in 3 other young healthy volunteers. For medium frequency 15 kHz of the range low-speed arrivals velocities result in wavelengths between 0.33 and 1 cm. Such small wavelengths may provide the spatial resolution in lung parenchyma about the first centimeters. Thus transmission sounding of lungs in the range of 10–19 kHz seems promising to provide high-resolution acoustic imaging or may be even transmission tomography of pulmonary parenchyma.