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Color Doppler and Artifacts Flashcards

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

Read the first 7 Color Doppler and Artifacts flashcards as text

  1. In power Doppler imaging compared to conventional color Doppler, which of the following is TRUE?

    Answer: Power Doppler is more sensitive to low-velocity flow

    Power Doppler maps the amplitude (power) of the Doppler signal, making it more sensitive to slow flow but sacrificing directional information.

  2. Which artifact causes a color Doppler signal to appear on the opposite side of a strong reflector at the same depth?

    Answer: Mirror image artifact

    Mirror image artifact duplicates the Doppler signal symmetrically on the opposite side of a specular reflector such as the pleura.

  3. The wall filter in color Doppler primarily removes signals from:

    Answer: Low-frequency shifts caused by slow-moving tissue

    The wall filter (high-pass filter) eliminates low-frequency Doppler shifts produced by vessel walls and surrounding tissue motion.

  4. Range ambiguity artifact in color Doppler occurs when:

    Answer: A second pulse is transmitted before echoes from the first pulse are received

    When PRF is too high for the imaging depth, returning echoes from deep structures arrive after the next pulse is sent, causing misregistration of color signals.

  5. Color Doppler sensitivity to slow flow is best improved by which combination of settings?

    Answer: Low PRF, high ensemble length, low wall filter

    Low PRF extends the velocity range downward, high ensemble length improves signal averaging, and low wall filter preserves slow-flow frequencies.

  6. On a color Doppler image, a vessel appears with both red and blue colors side by side in a straight segment. The most likely explanation is:

    Answer: The vessel curves so one limb moves toward and one away from the transducer

    When a vessel curves, different portions move toward and away from the transducer, producing opposite color assignments even in laminar flow.

  7. Which of the following increases the risk of color Doppler aliasing?

    Answer: Increasing the color box size to include deeper structures

    Greater imaging depth requires a lower PRF, which lowers the Nyquist limit and increases aliasing for a given flow velocity.