Hi Leslie,
I can tell you whatever you need to know about retrograde venography. I'm not up to that much typing but if you email me privately I'd be happy to chat on the phone with you. I have plenty of minutes on my cell and can call you if that is better for you.
Glen
P.S. Please make sure there is something in the subject header that refers to PTC or Venography so I don't delete it. I've been getting lots of spam lately.