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Question 33/44
Which color Doppler artifact is visualized in this image?
Correct Answer: B
The color Doppler image shows an artifact where high-velocity blood flow exceeds the Nyquist limit, resulting in color wrap-around or aliasing. This artifact is visualized as a mosaic pattern of colors that abruptly change, indicating that the velocity exceeds the color Doppler scale's maximum. Aliasing occurs when the sampling rate (pulse repetition frequency) is insufficient to accurately capture the high velocities, causing the display to cycle back to lower velocities.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hagen-Ansert SL. Textbook of Diagnostic Ultrasonography. 8th ed. St. Louis, MO: Mosby; 2017.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hagen-Ansert SL. Textbook of Diagnostic Ultrasonography. 8th ed. St. Louis, MO: Mosby; 2017.
- Question List (44q)
- Question 1: Which method of sanitizing the transducer would damage piezo...
- Question 2: Which pulsed-wave Doppler adjustment would be appropriate to...
- Question 3: What occurs when the pulse repetition frequency is less than...
- Question 4: What is the primary factor that improves lateral resolution?...
- Question 5: Which adjustment resulted in the change from image A to imag...
- Question 6: Which index is related to the likelihood of cavitation?...
- Question 7: In this image obtained from a tissue-mimicking phantom, whic...
- Question 8: Which resolution capability is most affected by spatial puls...
- Question 9: What is the primary reason to use compression?...
- Question 10: In this image, what does the data below the baseline represe...
- Question 11: Which setting can be increased to correct for clutter artifa...
- Question 12: Which will affect the gray-scale of a 2-D image?...
- Question 13: Which change can be made in order to avoid exceeding the Nyq...
- Question 14: Which adjustment would reduce the noise in the Doppler wavef...
- Question 15: Which statement characterizes the primary difference between...
- Question 16: What is the relationship between overall gain and image brig...
- Question 17: What determines the resonant frequency of a pulsed wave tran...
- Question 18: What is effected by increasing the color scale?...
- Question 19: Which machine setting could cause aliasing to occur?...
- Question 20: Which settings will lead to the highest temporal resolution?...
- Question 21: What is a potential negative consequence of using a high wal...
- Question 22: Which system control adjusts amplification of signals as a f...
- Question 23: What does damping in a pulsed-wave transducer affect?...
- Question 24: What improves the temporal resolution of color flow imaging?...
- Question 25: Which type of display process rescans only the region of int...
- Question 26: What happens to the Doppler shift when the angle is changed ...
- Question 27: If the pulse repetition frequency is 3 kHz, what is the maxi...
- Question 28: What does this image demonstrate? (Exhibit)...
- Question 29: What is the benefit of using a wall filter?...
- Question 30: How is intensity of an ultrasound beam measured?...
- Question 31: During 3-D volume acquisition, the quality of the images is ...
- Question 32: Which is a method to reduce noise?...
- Question 33: Which color Doppler artifact is visualized in this image? (E...
- Question 34: Which change was made after acquiring image A to produce ima...
- Question 35: Which factor affects temporal resolution?...
- Question 36: Which color control was adjusted in color bar A to produce c...
- Question 37: Which factor influences color flow imaging frame rate?...
- Question 38: What is the function of M-mode?...
- Question 39: Which technique averages individual frames together to impro...
- Question 40: During a color Doppler scan, which angle to flow would most ...
- Question 41: Which target group is used to evaluate transverse distance m...
- Question 42: Which feature is a characteristic of continuous wave Doppler...
- Question 43: Which resolution is improved by focusing?...
- Question 44: Which factor improves axial resolution?...
