I could utilize 3D Slicer to extract aortic root and coronary from a thorax-heart DICOM file. Now, I need to set rulers on the 3D view to show the horizontal and vertical distances on my model. However:
1- How I can make sure my ending points of the ruler are snapped exactly to my model points (say at the end of the coronary arteries) but not in some random points close to the model points?
2- I cannot force the ruler to stay in horizontal (0-degree) or vertical (90-degree) planes and it always has some sort of other angles.
2- I cannot transfer or move the location of the ruler after I set the ending points of the ruler (please see the attached photo).
Anyone can please suggest some solutions?
I can tell more detail if necessary.