button (or 
in the polygonal ruler
mode).
____________________________________________________________________________________________
Functionality is available in the Pro edition
____________________________________________________________________________________________
The DICOM Viewer allows you to place markers on an image and conduct linear measurements.
For details on working with the Marker tool, see Section 3.12. The use of the Ruler and Polygonal
ruler tools is described in Section 2.19 and Section 3.11.2. However, in the virtual endoscopy window
you should switch between the Polygonal ruler and Ruler tools, using the menu that opens by
clicking on the arrow on the right side of the button (or in the polygonal ruler
mode).