Figure 4
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1748-717X-5-29/MediaObjects/13014_2010_Article_235_Fig4_HTML.jpg)
The transverse views of CT and the 2nd CBCT. The transverse views of the reference CT (a) and cone beam CT (b) after two weeks of the treatment. A slight change happened in the external contour and air cavity.
The transverse views of CT and the 2nd CBCT. The transverse views of the reference CT (a) and cone beam CT (b) after two weeks of the treatment. A slight change happened in the external contour and air cavity.