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Okay, so let's apply some of these Doppler principles to carotid imaging.

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And this is probably one of the vascular studies that people who are just getting

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into Doppler are going to encounter pretty quickly.

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So what do we assess on a carotid ultrasound?

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Well, we want to identify the common carotid, the carotid bulb, the internal

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carotid, and external carotid arteries, and you have to figure out, well, how do I

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know which one of those I'm looking at?

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Well, the internal carotid artery is not going to have any branches, and the

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waveforms tend to be low resistance, as we mentioned.

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The external carotid artery is going to have branches present because it is

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perfusing all of the skeletal muscles.

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This is going to have a high resistance waveform.

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There's also something called the temporal tap maneuver, which we'll take a look

0:43

at, and that is one of the things that can typically confirm the ECA, although

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there are some times that you will see a temporal tap in an ICA as well, just

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depending on what gets transmitted.

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There's also the vertebral artery that we want to make sure that we're identifying,

0:56

and that has a separate waveform as well.