Figure 1.

The proposed superimposition method included a total of 6 cephalometric landmarks: Sella, Nasion, Portion, Orbitale, Basion, and Pterygoid. For each cephalometric radiograph (black line), the second tracing (red line) was superimposed until the sum of squared Euclidean distances between the six cranial base landmarks were minimized while Sella position remained in an identical position. This method can be expanded to superimpose j multiple images.