Dear Bill;

I would suggest you ask the vascular surgeons to let you watch an in situ 
procedure. You will appreciate their needs i.e. accuracy of mapping, 
luminal diameter, has the saphenous previously thrombosed? (echogenic and 
non-compressible by ultrasound), branches, valve cusps. Also we use Berol 
liquid tip all surface markers. They mark through gel. Mapping for the 
most part shouldn't be so tedious and time consuming. I'm sure if you spend 
time with the surgeons, you will learn quickly. 

Good luck!

Terry Case
University of Vermont