Table 2 Definition of linear measurements
From: Influence of orthodontic appliance-derived artifacts on 3-T MRI movies
Linear measurement | Definition |
|---|---|
Velar depth (VD) | Length of velar on the plane parallel to Sella-Nasion (SN) reference |
Velar height (VH) | Length of velar on the plane parallel to vertical reference to SN reference |
Retroglossal space (RS) | Distance between the top and bottom of the pharyngeal wall on the plane parallel to vertical reference to SN reference |
Laryngeal ventricle space (LVS) | Distance between the point of the most swelling to the point of the most remaining in the background |
Laryngeal ventricle-sphenoid sinus length (LVSL) | Distance between the posterior point of the larynx ventricle and the bottom of the sphenoid bone |
Hard-palate length (HPL) | Distance between the anterior nasal spine (ANS) and the posterior nasal spine (PNS) |
Lingual apex-pharyngeal length (LAPL) | Distance between the lingual apex and the posterior pharyngeal wall on the plane parallel to SN reference |
Lingual apex-hard palate length (LAHL) | Distance between the lingual apex and the hard palate wall on the plane parallel to vertical reference to SN reference |