Effect of rib-cage structure on acoustic chest impedance

Niels Henrik Zimmermann, Henrik Møller, John Hansen, Dorte Hammershøi, Per Rubak

Publikation: Bidrag til tidsskriftKonferenceabstrakt i tidsskriftForskningpeer review

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Resumé

When a stethoscope is placed on the surface of the chest, the coupler picks up sound from heart and lungs transmitted through the tissues of the ribcage and from the surface of the skin. If the acoustic impedance of the chest surface is known, it is possible to optimize the coupler for picking up even weak sounds originating from e.g. the heart. The acoustic impedance is influenced by the structure of the ribcage; hence the acoustic impedance will change depending on if the coupler has been placed on a top of a rib or between the ribs (the intercostal).

The impedance of the chest is measured in the frequency range from 40 Hz to 5 kHz using an acoustic impedance tube made specifically for the purpose. The measurements are carried out in a grid pattern on the surface of the chest. The grid is aligned according to the ribs; hence the measurements are either on a top of the ribs or between the ribs. The measurements reveal the structure of the ribcage from an acoustic point of view in addition to describing the variation of the impedance depending on the position of the coupler. The measurements are carried out on a small number of subjects.

The assessment of the ribcage structure based on impedance measurements is a part of a larger study which aims at optimizing an acoustic coupler for picking up weak murmur sounds from the coronary arteries of the heart.
OriginalsprogEngelsk
TidsskriftAcustica United with Acta Acustica
Vol/bind97
Udgave nummerSupplement 1
Sider (fra-til)23
ISSN1610-1928
StatusUdgivet - 2011
BegivenhedForum Acusticum 2011 - Aalborg, Danmark
Varighed: 27 jun. 20111 jul. 2011
Konferencens nummer: 6

Konference

KonferenceForum Acusticum 2011
Nummer6
LandDanmark
ByAalborg
Periode27/06/201101/07/2011

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chest
acoustic impedance
couplers
impedance
acoustics
stethoscopes
grids
impedance measurement
arteries
lungs
frequency ranges
Cage
Acoustics
tubes
Sound

Citer dette

Zimmermann, Niels Henrik ; Møller, Henrik ; Hansen, John ; Hammershøi, Dorte ; Rubak, Per. / Effect of rib-cage structure on acoustic chest impedance. I: Acustica United with Acta Acustica. 2011 ; Bind 97, Nr. Supplement 1. s. 23.
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abstract = "When a stethoscope is placed on the surface of the chest, the coupler picks up sound from heart and lungs transmitted through the tissues of the ribcage and from the surface of the skin. If the acoustic impedance of the chest surface is known, it is possible to optimize the coupler for picking up even weak sounds originating from e.g. the heart. The acoustic impedance is influenced by the structure of the ribcage; hence the acoustic impedance will change depending on if the coupler has been placed on a top of a rib or between the ribs (the intercostal).The impedance of the chest is measured in the frequency range from 40 Hz to 5 kHz using an acoustic impedance tube made specifically for the purpose. The measurements are carried out in a grid pattern on the surface of the chest. The grid is aligned according to the ribs; hence the measurements are either on a top of the ribs or between the ribs. The measurements reveal the structure of the ribcage from an acoustic point of view in addition to describing the variation of the impedance depending on the position of the coupler. The measurements are carried out on a small number of subjects.The assessment of the ribcage structure based on impedance measurements is a part of a larger study which aims at optimizing an acoustic coupler for picking up weak murmur sounds from the coronary arteries of the heart.",
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year = "2011",
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Zimmermann, NH, Møller, H, Hansen, J, Hammershøi, D & Rubak, P 2011, 'Effect of rib-cage structure on acoustic chest impedance', Acustica United with Acta Acustica, bind 97, nr. Supplement 1, s. 23.

Effect of rib-cage structure on acoustic chest impedance. / Zimmermann, Niels Henrik; Møller, Henrik; Hansen, John; Hammershøi, Dorte; Rubak, Per.

I: Acustica United with Acta Acustica, Bind 97, Nr. Supplement 1, 2011, s. 23.

Publikation: Bidrag til tidsskriftKonferenceabstrakt i tidsskriftForskningpeer review

TY - ABST

T1 - Effect of rib-cage structure on acoustic chest impedance

AU - Zimmermann, Niels Henrik

AU - Møller, Henrik

AU - Hansen, John

AU - Hammershøi, Dorte

AU - Rubak, Per

PY - 2011

Y1 - 2011

N2 - When a stethoscope is placed on the surface of the chest, the coupler picks up sound from heart and lungs transmitted through the tissues of the ribcage and from the surface of the skin. If the acoustic impedance of the chest surface is known, it is possible to optimize the coupler for picking up even weak sounds originating from e.g. the heart. The acoustic impedance is influenced by the structure of the ribcage; hence the acoustic impedance will change depending on if the coupler has been placed on a top of a rib or between the ribs (the intercostal).The impedance of the chest is measured in the frequency range from 40 Hz to 5 kHz using an acoustic impedance tube made specifically for the purpose. The measurements are carried out in a grid pattern on the surface of the chest. The grid is aligned according to the ribs; hence the measurements are either on a top of the ribs or between the ribs. The measurements reveal the structure of the ribcage from an acoustic point of view in addition to describing the variation of the impedance depending on the position of the coupler. The measurements are carried out on a small number of subjects.The assessment of the ribcage structure based on impedance measurements is a part of a larger study which aims at optimizing an acoustic coupler for picking up weak murmur sounds from the coronary arteries of the heart.

AB - When a stethoscope is placed on the surface of the chest, the coupler picks up sound from heart and lungs transmitted through the tissues of the ribcage and from the surface of the skin. If the acoustic impedance of the chest surface is known, it is possible to optimize the coupler for picking up even weak sounds originating from e.g. the heart. The acoustic impedance is influenced by the structure of the ribcage; hence the acoustic impedance will change depending on if the coupler has been placed on a top of a rib or between the ribs (the intercostal).The impedance of the chest is measured in the frequency range from 40 Hz to 5 kHz using an acoustic impedance tube made specifically for the purpose. The measurements are carried out in a grid pattern on the surface of the chest. The grid is aligned according to the ribs; hence the measurements are either on a top of the ribs or between the ribs. The measurements reveal the structure of the ribcage from an acoustic point of view in addition to describing the variation of the impedance depending on the position of the coupler. The measurements are carried out on a small number of subjects.The assessment of the ribcage structure based on impedance measurements is a part of a larger study which aims at optimizing an acoustic coupler for picking up weak murmur sounds from the coronary arteries of the heart.

M3 - Conference abstract in journal

VL - 97

SP - 23

JO - Acustica United with Acta Acustica

JF - Acustica United with Acta Acustica

SN - 1610-1928

IS - Supplement 1

ER -