ARDMS SPI Color Doppler and Artifacts 5

Question 1

Which statement about directional power Doppler (DPD) is correct?

Accepted Answer

DPD displays both flow direction and amplitude but with less flash artifact than power Doppler

Answer

Directional power Doppler combines the sensitivity of power Doppler with directional encoding while offering some reduction in flash artifact compared to standard power Doppler.

Question 2

On color Doppler, a vessel showing reversed color assignment relative to the adjacent artery in the same image most likely indicates:

Accepted Answer

Venous flow direction opposite to arterial flow

Answer

Veins normally carry blood in the opposite direction to adjacent arteries, producing the opposite color assignment by convention.

Question 3

The acoustic streaming artifact in color Doppler is seen as:

Accepted Answer

Color signal within a fluid-filled cyst caused by acoustic radiation force

Answer

Acoustic streaming occurs when ultrasound radiation force displaces fluid within a cyst, producing color Doppler signal in an otherwise avascular structure.

Question 4

When evaluating a small vessel for low-velocity flow, which transducer choice optimizes color Doppler sensitivity?

Accepted Answer

High-frequency linear array with low PRF

Answer

A high-frequency linear array provides better spatial resolution for small vessels, and low PRF lowers the Nyquist limit to detect slow flow.

Question 5

Color Doppler 'color bruit' (perivascular color artifact) around an AV fistula is caused by:

Accepted Answer

High-velocity turbulent flow causing tissue vibration that is detected as Doppler shifts

Answer

Tissue vibration from high-velocity turbulent flow in an AV fistula generates low-frequency Doppler shifts in surrounding soft tissue, producing a color bruit.

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI Color Doppler and Artifacts 5