Thankyou for link. I don't know which of my Jugular(s) were done with Doppler. I need to buy a anatomical chart asap so I have 1 more thing to make my head spin. Tomorrow I'll hopefullly have report and cd images of last week's test. Maybe i'll be able to contact the reviewer on my report and ask the "average size" question. That link was interesting. Looks like narrowing is a problem for more then MS.