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1 Department of Oral and Maxillofacial Surgery and 2 Department of Otorhinolaryngology, Head and Neck Surgery, University of Kiel, D-24105 Kiel, Germany; 3 Department of Otorhinolaryngology, St. Vincentius Hospital, D-76135 Karlsruhe, Germany; and 4 Department of Environmental and Occupational Medicine, University of Aarhus, DK-8000 Aarhus, Denmark
The aim of the present study was a
validation of acoustic rhinometry (AR) by computed tomography (CT). Six
healthy subjects were examined by CT and AR. The CT data were processed
in a computer program (AutoCAD), and a virtual three-dimensional model
of each nasal cavity was constructed. This model permitted an
individual prediction of the center line of the sound wave propagation
through the air volume of the nasal cavity with the cross-sectional
areas oriented perpendicularly to this line. The area-distance curves derived from AR and CT were compared. Linear regression analysis revealed a reasonable agreement of AR and CT in the anterior nose below
a mean of 6 cm distance from the nostrils [r = 0.839, P < 0.01, m = 1.123, b = 
0.113 (AR = m × CT + b)]. The
measuring accuracy using CT as gold standard revealed a mean error at
the nasal valve of <0.01 cm2 (4.52%) and at the nasal
isthmus of 0.02 cm2 (1.87%). Beyond 6 cm, the correlation
decreased (r = 0.419), and overestimation of the true
area occurred (>100%). In conclusion, the measurements were
reasonably accurate for diagnostic use up to the turbinate head region.
Certain factors induce an overestimation of the true areas beyond this
region. However, these factors are constant and reproducible in a
single subject, and intraindividual comparative measurements are
possible beyond the turbinate head region.
virtual model; nasal isthmus; nose anatomy; acoustic reflections; airway cross-sectional areas; computed tomography
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