Manual segmentation seems to be the most accurate method and allows for the most operator control ( El & Palomo, 2010).

The segmentation of the airway can be done manually or automatically. The next level up of CBCT is the advanced software tools involve airway tracing features that give the user the capability to delineate the airway’s boundaries, measure its volume, and calculate and locate the minimum area ( Chenin, 2015).Īlthough numerous methods with 2-dimensional (2D) cephalograms, providing limited data such as linear and angular has been proposed for upper airway studies, there were studies that evaluate the airway have introduced the use of CBCT, which made the 3D diagnosis of the patient became more accessible in dentistry. There were many studies ( Feng et al., 2015 Glupker et al., 2015 Iwasaki et al., 2009 Kim et al., 2010 Camacho, Capasso & Schendel, 2014 Zinsly et al., 2010 Ogawa et al., 2005) of the upper airway were analyzed or assessed using CBCT. Accurate and easy evaluation of the airway anatomy has been possible using those CBCT systems ( El & Palomo, 2010). CBCT systems have been developed specifically for the maxillofacial region with the advantage of the reduced radiation doses compared with conventional CT ( Ghoneima & Kula, 2013).

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