Some of the advanced
features of Viewbox are described below.
Detailed specifications are in the Specifications section
Orientation Cursor with Auto Edge-lock
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;76:619–624
Semi-automatic Location of Points using 'Snakes'
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.
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:
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.
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:
can perform Procrustes superimposition. It can calculate the Procrustes average shape
and the Principal Components of shape and display them in a graphical manner.