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Question 14/44
Which adjustment would reduce the noise in the Doppler waveform in this image?
Correct Answer: A
Noise in the Doppler waveform can often be attributed to excessive gain settings. Decreasing the Doppler gain reduces the amplification of both the signal and the noise, thus providing a clearer and more accurate Doppler waveform. Excessive gain can cause speckling and clutter, which obscure the true Doppler signals. By reducing the gain, the noise level is minimized, resulting in a cleaner Doppler signal representation.
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?...
