Acoustic rhinometry is a diagnostic measurement of cross sectional area and length of the nose and the nasal cavity through acoustic reflections.[1] It can be used to measure nasal anatomical landmarks, and nasal airway changes in response to allergen provocation tests. The size and the pattern of the reflected sound waves provide information on the structure and dimensions of the nasal cavity, with the time delay of reflections correlating with the distance from the nostril.
The test is carried out by generating an acoustic pulse from a speaker or spark source and this sound pulse is transmitted to the nose along a tube. This sound pulse is reflected back to a microphone and this reflection is generated according to the changes in the local acoustic impedance related to cross-sectional area of the nasal cavity. The microphone transmits the sound signal to an amplifier and to a computer which processes it into an area distance graph.
These measurements correlate well with area measurements done by CT scans and nasal airway resistance measured by rhinomanometry, but they are sometimes unreliable in the posterior area and when the nasal area is congested.[2][3][4]
Advantagesedit
The main advantage of this procedure is that it is non-invasive providing a measure of nasal cross-sectional area with the length of the nasal passage in real time data. This can be done in the office, operating room, or hospital. This cross-sectional area can also be expressed as nasal volume along the nasal passage from the inferior turbinate to the 7 cm area of the nose before the merging of the two nasal passages into one.[5]
Normal valuesedit
Minimum cross-sectional area of nasal passage within normal levels is 0.7 cm2 which ranges around 0.3-1.2 cm2. During decongestion it can increase to around 0.5-1.3 cm2. Accuracy of this method is dependent on the interface between the nose and the equipment. Mispositioning of the tube or air leaks can cause results to vary.[6]
Referencesedit
^E W Fisher; V J Lund; G K Scadding (July 1994). "Acoustic rhinometry in rhinological practice: discussion paper". Journal of the Royal Society of Medicine. 87 (7): 411–413. PMC1294654. PMID 8046730.
^O, Hilberg; AC, Jackson; DL, Swift; OF, Pedersen (1989). "Acoustic Rhinomtry: Evaluation of nasal cavity geometry by acoustic reflection". Journal of Applied Physiology. 66 (1): 295–303. doi:10.1152/jappl.1989.66.1.295. PMID 2917933.
^J, Numminen; P, Dastidar; T, Heinonen; T, Karhuketo; M, Rautiainen (2003). "Reliability of Acoustic Rhinometry". Respiratory Medicine (97): 421–7.
^LF, Grymer; O, Hilberg; OF, Pedersen; TR, Rasmussen (1991). "Acoustic Rhinometry: Values from Adults with subjective nomal nasal patency". Rhinology (29): 35–47.
^O, Hilberg; OF, Pedersen (2000). "Acoustic Rhinometry: Recommendations for technical specifications and standard operating procedures". Rhinology Supplement (16): 3–17.
^EW, Fisher; NJ, Daly; DP, Morris; VJ, Lund (1994). "Experimental Studies of the resolution of acoustic rhinometry in-vivo". Acta Oto-Laryngologica (114): 647–50.
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acoustic, rhinometry, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, janua. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Acoustic rhinometry news newspapers books scholar JSTOR January 2013 Learn how and when to remove this template message Acoustic rhinometry is a diagnostic measurement of cross sectional area and length of the nose and the nasal cavity through acoustic reflections 1 It can be used to measure nasal anatomical landmarks and nasal airway changes in response to allergen provocation tests The size and the pattern of the reflected sound waves provide information on the structure and dimensions of the nasal cavity with the time delay of reflections correlating with the distance from the nostril Acoustic rhinometryMeSHD023842 Contents 1 Method 2 Advantages 3 Normal values 4 ReferencesMethod editThe test is carried out by generating an acoustic pulse from a speaker or spark source and this sound pulse is transmitted to the nose along a tube This sound pulse is reflected back to a microphone and this reflection is generated according to the changes in the local acoustic impedance related to cross sectional area of the nasal cavity The microphone transmits the sound signal to an amplifier and to a computer which processes it into an area distance graph These measurements correlate well with area measurements done by CT scans and nasal airway resistance measured by rhinomanometry but they are sometimes unreliable in the posterior area and when the nasal area is congested 2 3 4 Advantages editThe main advantage of this procedure is that it is non invasive providing a measure of nasal cross sectional area with the length of the nasal passage in real time data This can be done in the office operating room or hospital This cross sectional area can also be expressed as nasal volume along the nasal passage from the inferior turbinate to the 7 cm area of the nose before the merging of the two nasal passages into one 5 Normal values editMinimum cross sectional area of nasal passage within normal levels is 0 7 cm2 which ranges around 0 3 1 2 cm2 During decongestion it can increase to around 0 5 1 3 cm2 Accuracy of this method is dependent on the interface between the nose and the equipment Mispositioning of the tube or air leaks can cause results to vary 6 References edit E W Fisher V J Lund G K Scadding July 1994 Acoustic rhinometry in rhinological practice discussion paper Journal of the Royal Society of Medicine 87 7 411 413 PMC 1294654 PMID 8046730 O Hilberg AC Jackson DL Swift OF Pedersen 1989 Acoustic Rhinomtry Evaluation of nasal cavity geometry by acoustic reflection Journal of Applied Physiology 66 1 295 303 doi 10 1152 jappl 1989 66 1 295 PMID 2917933 J Numminen P Dastidar T Heinonen T Karhuketo M Rautiainen 2003 Reliability of Acoustic Rhinometry Respiratory Medicine 97 421 7 LF Grymer O Hilberg OF Pedersen TR Rasmussen 1991 Acoustic Rhinometry Values from Adults with subjective nomal nasal patency Rhinology 29 35 47 O Hilberg OF Pedersen 2000 Acoustic Rhinometry Recommendations for technical specifications and standard operating procedures Rhinology Supplement 16 3 17 EW Fisher NJ Daly DP Morris VJ Lund 1994 Experimental Studies of the resolution of acoustic rhinometry in vivo Acta Oto Laryngologica 114 647 50 nbsp This medical diagnostic article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Acoustic rhinometry amp oldid 1036985027, wikipedia, wiki, book, books, library,
