Figure 4

Oropharyngeal airway volume segmentation. PNS, posterior nasal spine; OdP, middle point of odontoid process of second cervical vertebra; Epi, epiglottis landmark.
Oropharyngeal airway volume segmentation. PNS, posterior nasal spine; OdP, middle point of odontoid process of second cervical vertebra; Epi, epiglottis landmark.