Differences in Velopharyngeal Structure during Speech among Asians Revealed by 3-Tesla Magnetic Resonance Imaging Movie Mode
Table 2
The study parameters and their definitions.
Parameter
Definition
Hard-palate length
Distance between the anterior nasal spine (ANS) and the posterior nasal spine (PNS)
Velopharyngeal depth
Distance between the PNS and the posterior pharyngeal wall on the plane parallel to the hard palate
Velar length
Distance between the PNS and the tip of velum on the curvature along the velum
Velar thickness
Distance between the velar knee and velar dimple
Retroglossal space
Distance between the tongue and posterior pharyngeal wall on the plane parallel to the hard palate and through the anteroinferior border of the second vertebra (C2)