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Cerebrovascular Duplex Examinations Flashcards

7 cards from real CCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In transcranial Doppler (TCD), the middle cerebral artery (MCA) is most commonly insonated through which acoustic window?

    Answer: Transtemporal window

    The transtemporal window, located superior to the zygomatic arch, provides the primary access for MCA insonation in TCD.

  2. A normal vertebral artery waveform is best described as:

    Answer: Low-resistance with continuous antegrade flow throughout diastole

    The vertebral artery supplies the low-resistance posterior circulation, producing a low-resistance waveform with continuous forward diastolic flow.

  3. Which condition would cause a unilateral increase in common carotid artery diastolic flow velocity?

    Answer: Ipsilateral ICA high-grade stenosis

    Ipsilateral ICA stenosis increases downstream resistance demand, elevating the diastolic component of the CCA waveform feeding it.

  4. What is the primary purpose of using power Doppler (energy Doppler) instead of color flow Doppler during carotid duplex?

    Answer: To detect very slow flow in a near-total occlusion

    Power Doppler is highly sensitive to slow flow and is used to differentiate near-occlusion from complete occlusion where color Doppler may miss a trickle of flow.

  5. Intima-media thickness (IMT) measurement on carotid duplex is performed at which arterial wall layer?

    Answer: Trailing edge of intima to leading edge of adventitia

    IMT is measured from the trailing (far) wall's intima-lumen interface to the media-adventitia interface on B-mode imaging.

  6. A patient with complete ICA occlusion would most likely show which waveform pattern in the ipsilateral CCA?

    Answer: High-resistance pattern with reduced or absent diastolic flow

    ICA occlusion eliminates the low-resistance contribution from the ICA, leaving only the high-resistance ECA component in the CCA, reducing diastolic flow.

  7. During evaluation of the carotid bifurcation, the carotid bulb normally demonstrates which flow pattern?

    Answer: A zone of flow separation and reversal along the outer wall

    The carotid bulb's geometry causes a normal zone of boundary layer separation and helical flow reversal along the outer wall opposite the flow divider.