Zajac D J, Yates C C
Cleft Palate-Craniofacial Center, School of Dental Medicine, University of Pittsburgh.
J Speech Hear Res. 1991 Oct;34(5):1073-8. doi: 10.1044/jshr.3405.1073.
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/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.
进行了一项分为两部分的研究，以确定当通过经验确定流量系数k时，压力-流量法在估计诱发的腭咽口面积方面的准确性。在研究1中，将长度为4.5厘米、内径分别为3.2毫米、4.8毫米和6.4毫米的短管放置在声道模型中，并计算相关的流量系数。在研究2中，将内径为4.8毫米的管子插入一名正常成年受试者的鼻咽部，以在发出音节/pa/时诱发口鼻耦合。该人类受试者的结果显示，已知口面积与估计口面积之间的误差约为7%。这一发现表明，当口的流量系数已知时，压力-流量技术是准确的。建议未来的研究尝试估计与人类腭咽口几何形状相关的流量系数，以提高压力-流量技术的准确性。
