Skip to main content

Table 3 Pharyngeal airway measurements

From: Postoperative changes in the pharyngeal airway space through computed tomography evaluation after mandibular setback surgery in skeletal class III patients: 1-year follow-up

Measurements Definition
Nph AP Nasopharyngeal airway distance, anteroposterior distance at CV1 level
Oph AP Oropharyngeal airway distance, anteroposterior distance at CV2 level
Hph AP Hypopharyngeal airway distance, anteroposterior distance at CV4 level
Nph vol Nasopharyngeal airway volume, top of the pharyngeal airway to CV1 plane
Oph vol Oropharyngeal airway volume, between the CV1 plane and CV2 plane
Hph vol Hypopharyngeal airway volume, from CV2 plane to CV4 plane
Whole pharynx volume Sum of the Nph volume, Oph volume, and Hph volume
SV-B The distance from the sella vertical plane to the B point