We can't really tell you as it depends on what area(s) are under suspicion.
I had a vascular ultrasound when I developed some thrombophlebitis after a poorly diluted medication. In addition to the 4 areas of phlebitis they found a blood clot in my left axillary vein from the poorly diluted medication.
I had a carotid doppler ultrasound (vascular ultrasound on the carotid arteries).
They use vascular ultrsound to determine PAD (peripheral artery disease). (Ooops, my mistake, that would be an arterial ultrasound).
My computer says I need to upgrade my brain to be compatible with its new software.