Advanced Features
Some of the advanced features of Viewbox are described below. Detailed specifications are in the Specifications section.

Orientation Cursor with Auto Edge-lock
During digitization of cephalometric points, the cursor orients itself so that it is easier to position the point at the proper location.
Also, the cursor snaps on the bony outline automatically, so that it is not necessary to click exactly on the boundary. In the animation below, observe how the blue line always remains on the outline of the mandibular symphysis, even though the mouse cursor (red circle) moves up and down and left and right:
Screen capture of auto edge-locking cursor.
You no longer have to be careful and click the mouse exactly on the bony boundary. The point will be digitized correctly:

The Auto Edge-Lock feature was evaluated in the paper "Validity and Reliability of a New Edge-based Computerized Method for Identification of Cephalometric Landmarks" by Serge Kazandjian, Stavros Kiliaridis and Anestis Mavropoulos (Angle Orthod 2006;76:619624).

Semi-automatic Location of Points using 'Snakes'
Cephalometric points that lie on bony or soft-tissue outlines can be located automatically by Viewbox. You just need to fit a contour on the outline and Viewbox will then locate the points on the outline, according to predefined rules. The animation below shows how a contour is fitted to the symphysis. Here, the user first translates the snake close to the mandibular symphysis and then clicks the Fit button (F), so that the snake adjusts itself around the symphysis. The Fit button is clicked twice, in order to achieve a better fit:
Screen capture of snake fitting.
After fitting the contour, the cephalometric points are located just by clicking the Auto-locate button (A). Viewbox knows that e.g. Pogonion is the most anterior point on the contour and will locate it there. Such point definitions can be changed by the user, and if you disagree on the Viewbox placement, you can always override it.
Screen capture of auto point location.

Image Enhancement
Viewbox includes a number of sophisticated image enhancement algorithms that can increase clarity and reveal structures too difficult to see otherwise. The images below show the application of the Contrast Limited Adaptive Histogram Equalization (CLAHE) filter. Notice especially the area of the hyoid bone:

Structural Superimposition
Viewbox allows you to superimpose the images of two radiographs, so that you can do structural superimpositioning. This is accomplished by making the top image semi-transparent. A colourising option and a special blending function are available that help significantly. The picture below shows two radiographs superimposed at the sella turcica. The radiographs have been colourised in red and green. Areas that superimpose well show in yellow.

Interactive Morphing
The results of treatment predictions can be visualized immediately by using the new Interactive Morph window. The photograph of the patient is changed interactively, while adjusting the tracing with the mouse:

Viewbox can perform Procrustes superimposition. It can calculate the Procrustes average shape and the Principal Components of shape and display them in a graphical manner.
Learn more about morphometrics...