1. On the Vessel Analysis toolbar, click New Vessel .
The list of protocols is displayed (Aorta, General Vessel, Neck, and Manual).
2. Select the required protocol type.
3. Follow the instructions for how to trace a vessel using each protocol option:
Aorta Protocol (see Tracing the Aorta and Iliac Arteries).
General Vessel Protocol (see Tracing Vessels).
Neck Protocol (see Tracing Carotid Arteries Using the Neck Protocol). This protocol is specifically designed for images of the neck.
Manual Protocol (see Tracing Vessels Manually).
In each case, you should define the start, intermediate, and end points for the vessel tracking.