You can mark the vessel path (start point, intermediate points, and end point) by placing markers on any of the four displayed images. The system connects the points you marked with lines to show the vessel path.
NOTE: Marking points on the 3D image is not recommended because you cannot be sure exactly where the point is being placed. If you decide to mark the vessel path point(s) on the 3D image, examine the reference images to check that you marked the point(s) accurately.
1. On the Coronary Analysis toolbar, click New Vessel 
.
A list of protocols appears.
2. Select Manual Protocol.
3. Enter the Vessel Name in the Manual Protocol window.
4. Mark the vessel start point by placing a marker on one of the images.
5. Mark the vessel path by placing extra points on the same image on which you placed the start point marker.
6. Mark the vessel end point.
7. Click Done 
.