ARDMS SPI Color Doppler and Artifacts 3

Question 1

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

Accepted Answer

Power Doppler is more sensitive to low-velocity flow

Answer

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

Question 2

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

Accepted Answer

Mirror image artifact

Answer

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

Question 3

The wall filter in color Doppler primarily removes signals from:

Accepted Answer

Low-frequency shifts caused by slow-moving tissue

Answer

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

Question 4

Range ambiguity artifact in color Doppler occurs when:

Accepted Answer

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

Answer

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.

Question 5

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

Accepted Answer

Low PRF, high ensemble length, low wall filter

Answer

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

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI - ARDMS Sonography Principles and Instrumentation Practice Test

ARDMS SPI Color Doppler and Artifacts 3