Figure 2.

Measurements of the volume and cross-sectional area of the nasal airway using cone beam computed tomography in patients who underwent nonsurgical miniscrew-assisted rapid maxillary expansion. (A) Reconstructed two-dimensional lateral cephalogram for the identification of landmarks and reference planes. (B) Three-dimensional reconstructed nasal airway. (C), (D), (E) Cross-sectional area in the ANS-perp., choanae, and C3 planes, respectively. Please refer to Table 1 for definitions of each landmark and reference plane.