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Journal of Speech and Hearing Research Vol.34 1073-1078 October 1991.
© American Speech-Language-Hearing Association
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Accuracy of the Pressure-Flow Method in Estimating Induced Velopharyngeal Orifice Area

Effects of the Flow Coefficient

David J. Zajac 1
Campbell C. Yates 2
1 Cleft Palate-Craniofacial Center School of Dental Medicine University of Pittsburgh
2 School of Engineering University of Pittsburgh

A two-part study was conducted to determine the accuracy of the pressure-flow method in estimating induced velopharyngeal orifice areas when the flow coefficient k was empirically determined. In Study 1, short tubes, 4.5 cm in length and with internal diameters of 3.2, 4.8, and 6.4 mm, were placed in a model of the vocal tract, and the associated flow coefficients were calculated. In Study 2, the 4.8-mm internal diameter tube was inserted into the nasopharynx of a normal adult subject to induce oronasal coupling during production of the syllable I/pa/. Results for the human subject revealed that the error between the known and estimated orifice areas was approximately 7%. This finding indicates that the pressure-flow technique is accurate when the flow coefficient of the orifice is known. It is suggested that future research attempt to estimate flow coefficients associated with the geometry of the human velopharyngeal orifice in order to improve the accuracy of the pressure-flow technique.

KEY WORDS: pressure-flow, flow coefficient, hydrokinetic equation, induced oronasal coupling, velopharyngeal inadequacy

Submitted on August 2, 1990
Accepted on January 11, 1991


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