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ARDMS Sonography Principles and Instrumentation Sample Questions (Q45-Q50):
NEW QUESTION # 45
Which adjustment would reduce the noise in the Doppler waveform in this image?
Answer: C
Explanation:
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.
References:
ARDMS Sonography Principles & Instrumentation Guidelines
Hagen-Ansert SL. Textbook of Diagnostic Ultrasonography. 8th ed. St. Louis, MO: Mosby; 2017.
NEW QUESTION # 46
Which technique averages individual frames together to improve the image?
Answer: D
Explanation:
Persistence is a technique used in ultrasound imaging that averages individual frames together to improve the overall image quality. This process helps to reduce noise and improve the signal-to-noise ratio, leading to clearer and more stable images. By averaging multiple frames, transient artifacts are minimized, and the continuity of structures is better visualized. Persistence is particularly useful in imaging static or slow-moving structures. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Ultrasound Physics and Technology: How, Why and When" by M. Evans, C. Archer, and K. Weston
NEW QUESTION # 47
What adjustment is needed to optimize the color in the image below?
Answer: B
Explanation:
* Increasing the pulse repetition frequency (PRF) helps to optimize the color Doppler imaging by reducing aliasing.
* Aliasing occurs when the PRF is too low to accurately sample the rapid blood flow velocities, leading to incorrect color representation.
* By increasing the PRF, the system can more accurately measure higher velocities without distortion, improving the overall quality of the color Doppler image.References:
* ARDMS Sonography Principles and Instrumentation guidelines on Doppler imaging and techniques to reduce aliasing.
NEW QUESTION # 48
Which adjustment is needed to optimize the waveform below?
Answer: A
Explanation:
The waveform in the image shows spectral Doppler signals that are pushed against the upper limit of the display, indicating that the baseline is too high. Lowering the baseline allows for a better visual representation of the entire Doppler signal within the available display range. This adjustment prevents the waveform from being cut off and helps in accurately interpreting the blood flow characteristics.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Kremkau FW. Sonography Principles and Instruments. 9th ed. Philadelphia, PA: Elsevier; 2016.
NEW QUESTION # 49
Which pulsed-wave Doppler adjustment would be appropriate to correct the aliasing seen in this image?
Answer: B
Explanation:
Aliasing in pulsed-wave Doppler occurs when the sampled Doppler frequency exceeds the Nyquist limit, which is half of the pulse repetition frequency (PRF). This results in an incorrect representation of the blood flow velocities, causing the waveform to wrap around and appear on the opposite side of the baseline. To correct aliasing, the PRF should be increased, which raises the Nyquist limit and allows for accurate measurement of higher velocities without aliasing. Increasing the PRF effectively reduces the likelihood of aliasing artifacts in the Doppler signal.
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.
NEW QUESTION # 50
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