Wideband acoustic transmission of human lungs

Goncharoff, Vladimir; Jacobs, John E.; Cugell, David W.

doi:10.1007/bf02441471

Cited by 15 publications

(11 citation statements)

References 22 publications

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“…1b: sound travels at low sound frequencies (< 1 kHz) at only 50 m/sec as is characteristic for quasi-homogeneous air-tissue-compound and it travels between 10 kHz and 1 MHz at the speed in compact tissue. Between 1 kHz and 10 kHz sound is not transmitted, similar to the frequency gap already observed by Goncharoff et al [13]. To examine this hypothesis together with some clinical ramifications, ultrasound transmission above 1 kHz was studied in healthy subjects, and in patients suffering from the presence of extra water (pleural effusion) or extra air (pneumothorax following pleural effusion, emphysema) in their thorax.…”

mentioning

confidence: 77%

“…3a) rather than echo [2] or tracheal air sound [13]. The sound was emitted by a transducer on the back and detected at the sternum at the height of the heart (• ▶ Fig.…”

Section: Healthy Subjects: Initial Studiesmentioning

confidence: 99%

“…A patent describes that at 250 kHz the runtime of ultrasound through the thorax is "somehow" modulated by respiration without saying or showing that this ultrasound actually transmits the lungs [12]. In addition, to the best of our knowledge, only once before have human subjects been probed with sound frequencies between 1 -20 kHz [13]. In that study air sound was applied to the trachea and detected at the subjects' back.…”

mentioning

confidence: 99%

“…Moreover, this novel acoustic band may lend itself to a sensitive non-invasive method of thoracic imaging, with considerable diagnostic potential. It is important to note that the frequencies in this band are much lower (0.01 -1 MHz) than those used for the conventional ultrasound in sonography (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). The new hypothesis regarding sound transmission in the lungs is summarized in • ▶ Fig.…”

mentioning

confidence: 99%

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Low-Frequency Ultrasound Permeates the Human Thorax and Lung: a Novel Approach to Non-Invasive Monitoring

et al. 2009

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mentioning

confidence: 77%

“…3a) rather than echo [2] or tracheal air sound [13]. The sound was emitted by a transducer on the back and detected at the sternum at the height of the heart (• ▶ Fig.…”

Section: Healthy Subjects: Initial Studiesmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Low-Frequency Ultrasound Permeates the Human Thorax and Lung: a Novel Approach to Non-Invasive Monitoring

et al. 2009

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“…Another group have registered slower waves in 10-19 kHz band with speeds from 50 m/s to 300 m/s [33]. An earlier study of sound transmission between trachea and back in the frequency band 1-20 kHz revealed no transmission between 5 and 12 kHz, but some transmission at 12 kHz [34]. Low frequency ultrasound is suitable for detecting air trapping [35].…”

Section: Forced Vibrationsmentioning

confidence: 99%

Biophysics of Chest Vibrations

Dyachenko¹

2017

J Apl Theol

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The purpose of this mini-review is to outline diversity of chest wall vibrations, specify biomechanical peculiarities and point out a few problems crucial for development of diagnostic and therapeutic applications of chest wall vibrations. The review considers two types of chest wall vibrations: spontaneous, induced by breathing, and forced (or artificial), induced by external vibration forces. Spontaneous vibrations emerge in airways and lung tissues due to vortexes, flatter and stress relaxation in pulmonary parenchyma. The vibrations propagate in lung to the chest wall and could be registered by a stethoscope at the chest wall surface as respiratory sounds. Another type of vibrations emerges due to heart contraction and become apparent at the chest wall surface as heart sounds. Respiratory and heart sounds are used for diagnostics of respiratory and heart diseases. Computerized respiratory sounds analysis (CRSA) is a new technique emerged last years and based on respiratory acoustics and biomedical engineering. Forced vibrations are the lung and chest wall vibrations induced by external vibrations effecting airways orifice and/or chest wall. Diagnostic and therapeutic forced vibrations differ in both frequency and amplitude. Diagnostic vibrations imposed at the airway orifice include forced oscillatory technique, estimation of airway cross-section by analysis of acoustic pulse response measurements. Stress and deformation oscillations used for diagnostic techniques usually are small to avoid any mechanical nonlinearity. Diagnostic vibrations imposed at the chest surface include a special kind of forced oscillatory technique with pressure oscillation around the entire chest and a technique of percussions imposed locally to the areas of interest on the chest wall. Elastic waves propagate in airways, pulmonary parenchyma and chest wall during vibrations. Peculiarities of elastic waves propagation in these structures are discussed. A high sound or low ultrasound window presents new emerging perspective area for biomedical engineering aimed to develop a technique for lung sound/ultrasound imaging. There are a few kinds of therapeutic forced vibrations aimed to enhance airway sputum removal if the production of sputum is too large due to decease.

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Bilateral asymmetry of respiratory acoustic transmission

Wodicka

DeFrain

Kraman

1994

Med. Biol. Eng. Comput.

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Sonic noise transmission from the mouth to six sites on the posterior chest wall is measured in 11 healthy adult male subjects at resting lung volume. The measurement sites are over the upper, middle and lower lung fields and are symmetric about the spine. The ratios of transmitted sound power to analogous sites over the right (R) and left (L) lung fields are estimated over three frequency bands: 100-600 Hz (low), 600-1100 Hz (mid) and 1100-1600 Hz (high). A R-L dominance in transmission is measured at low frequencies, with a statistically significant difference observed at the upper site. No significant asymmetry is observed in any measurement site at mid or high frequencies. A theoretical model of sound transmission that includes the asymmetrical anatomy of the mediastinal structures is in agreement with the observed asymmetry at low frequencies. These findings suggest that the pathway of the majority of sound transmission from the trachea to the chest wall changes from a more radial to airway-borne route over the measured frequency range.

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Wideband acoustic transmission of human lungs

Cited by 15 publications

References 22 publications

Low-Frequency Ultrasound Permeates the Human Thorax and Lung: a Novel Approach to Non-Invasive Monitoring

Low-Frequency Ultrasound Permeates the Human Thorax and Lung: a Novel Approach to Non-Invasive Monitoring

Biophysics of Chest Vibrations

Bilateral asymmetry of respiratory acoustic transmission

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