Does my friend need to have specific symptoms in order to be referred for a doppler imaging x ray? If yes, what are they?

Vascular problems. Doppler is ultrasound usually used to look at veins and arteries in neck, arms, legs, kidneys, ovaries etc. It can determine narrowing of arteries and clots in blood vessels. Ischemia to certain organs such as ovaries and testes can be imaged.