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What is the best reason for the pulsatility and phasicity seen in the pulsed wave Doppler spectrum below?

What is the cosine of a 90-degree angle?  

Which of the following terms would describe a chronic DVT?

What conclusion can definitely be drawn based on the following image:   

What percentage of internal carotid disease is present with a PSV of 190cm/s and an EDV of 65 cm/s with a ratio of 2.3.  

Which view is appropriate to evaluate the MCA in TCD?

During a duplex venous exam, which of the following findings is the least likely to be associated with acute deep venous thrombosis? HINT – think about what you know about DVT and what you would expect to see with that pathology.

Upon identification of a knocking waveform, we know that disease is most likely in which location with respect to where we are interrogating the vessel?   

Divide using long division. Show work on scrap paper or type work in box.(x2 – 15x + 54) ÷ (x + 4)

The vertebral artery should normally have antegrade flow.