ARDMS SPI - ARDMS Sonography Principles and Instrumentation Color Doppler and Artifacts Questions and Answers

Question 1

A sonographer performing a color Doppler study of the carotid artery observes a mosaic pattern of colors in the center of the vessel where flow velocity is highest. This artifact is most likely:

Accepted Answer

Aliasing, which should be corrected by increasing the PRF/Scale.

Answer

Clutter, which should be corrected by increasing the wall filter.

Answer

Mirror image, which should be corrected by changing the Doppler angle.

Answer

Color bleed, which should be corrected by decreasing the color gain.

Question 2

Which of the following is a primary advantage of Power Doppler when compared to conventional Color Doppler?

Accepted Answer

It is more sensitive to slow flow and is not subject to aliasing.

Answer

It provides quantitative velocity and direction information.

Answer

It has a significantly higher temporal resolution.

Answer

It is less susceptible to flash artifact from patient motion.

Question 3

While evaluating blood flow, a sonographer notices low-frequency, high-amplitude color signals originating from the vessel walls that obscure the true flow within the lumen. Which control should be adjusted to mitigate this specific artifact?

Accepted Answer

Wall Filter

Answer

Color Gain

Answer

PRF/Scale

Answer

Doppler Angle

Question 4

During a renal ultrasound, a sonographer places the color Doppler box over a suspected kidney stone. A rapidly changing, mosaic pattern of color appears immediately posterior to the hyperechoic structure, despite the absence of true blood flow. This specific finding is known as:

Accepted Answer

Twinkle artifact

Answer

Crosstalk artifact

Answer

Power Doppler bloom

Answer

Reverberation artifact

Question 5

A sonographer is optimizing a color Doppler image and notices that the color extends beyond the vessel walls into the surrounding stationary tissue. Which of the following adjustments should be made FIRST to correct this?

Accepted Answer

Decrease the color gain

Answer

Increase the PRF/Scale

Answer

Decrease the wall filter

Answer

Change the Doppler angle

Question 6

All of the following are established methods for reducing or eliminating aliasing in a color Doppler image EXCEPT:

Accepted Answer

Increasing the wall filter

Answer

Increasing the Pulse Repetition Frequency (PRF)

Answer

Shifting the baseline

Answer

Decreasing the transducer frequency