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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. The Nyquist limit for color Doppler is defined as:

    Answer: Half the pulse repetition frequency

    The Nyquist limit equals PRF/2; velocities producing Doppler shifts above this threshold will alias and wrap to the opposite color.

  2. Color priority threshold in color Doppler determines:

    Answer: Which pixels display color versus grayscale based on echo amplitude

    Color priority sets the brightness level above which grayscale tissue signal overrides color, preventing color from painting solid structures.

  3. Spectral broadening on a color Doppler-guided pulsed wave trace at a stenosis is caused by:

    Answer: A wide range of velocities from turbulent flow filling the spectral window

    Turbulent flow post-stenosis contains a broad distribution of velocities that fill the spectral window, producing spectral broadening.

  4. Which artifact can make a non-vascular structure such as a simple cyst appear to contain color Doppler signal?

    Answer: Color bleed (blooming)

    Excessive color gain (blooming) can cause color signal to spill into adjacent avascular structures such as simple cysts.

  5. In color Doppler, increasing the color box angle (steering) away from perpendicular to the vessel:

    Answer: Improves Doppler angle and increases color sensitivity

    Steering the color box to achieve a smaller insonation angle increases the cosine factor, producing larger frequency shifts and better color filling.

  6. A patient's renal artery color Doppler shows a focal zone of aliasing followed by a color void. What does the color void most likely represent?

    Answer: An area of post-stenotic turbulence causing signal cancellation

    Severe turbulence can cause destructive interference of returning signals, creating apparent color voids distal to a tight stenosis.

  7. The color Doppler 'ghosting' artifact differs from flash artifact in that ghosting:

    Answer: Appears as persistent color in a specific location after the source has moved

    Ghosting is a residual color signal that lingers at a location after a moving structure has passed, due to slow color frame updates.