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ARDMS Sonography Principles and Instrumentation Sample Questions (Q123-Q128):

NEW QUESTION # 123
Which technique averages image frames over time to reduce noise?

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Persistence is a post-processing technique that averages multiple consecutive image frames to reduce random noise and improve image smoothness. This is especially useful for reducing speckle and enhancing the clarity of stationary or slow-moving structures.
According to official sonography Principles and Instrumentation documentation:
"Persistence uses frame averaging, combining data from several sequential frames to reduce noise, enhance image quality, and stabilize the appearance of stationary structures." Demodulation (A) is part of signal processing that extracts the Doppler frequency shift.
Compression (C) alters the dynamic range of the image but does not reduce noise through frame averaging.
Time gain compensation (D) adjusts amplification at various depths to equalize brightness but does not perform frame averaging.
Therefore, the correct answer is B: Persistence.


NEW QUESTION # 124
Which adjustment can maintain the same frame rate when the depth is increased?

Answer: C

Explanation:
When the depth of imaging is increased, the time it takes for the ultrasound pulses to travel to and from the deeper structures also increases, which can reduce the frame rate. To maintain the same frame rate, one effective adjustment is to decrease the image width. Narrowing the image width reduces the number of scan lines required to create each frame, allowing the system to maintain a higher frame rate despite the increased depth.
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments.


NEW QUESTION # 125
What is the term for the change in direction of a sound wave crossing a tissue boundary at an oblique angle?

Answer: A

Explanation:
Refraction is the change in direction of a sound wave as it crosses a boundary between two different tissues at an oblique angle, where there is a difference in propagation speeds between the tissues. This bending of the sound wave path occurs due to the change in speed, causing the wave to change direction according to Snell's law. Refraction can result in artifacts such as edge shadowing and displacement of structures in an ultrasound image.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hedrick WR, Hykes DL, Starchman DE. Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA: Elsevier Saunders; 2005.


NEW QUESTION # 126
Which type of resolution does damping improve?

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Damping reduces the number of cycles per pulse, shortening pulse duration and spatial pulse length, which directly improves axial resolution.
Principles and Instrumentation:
"Axial resolution improves with shorter spatial pulse length, achieved by damping, which limits ringing of the transducer." Lateral resolution (A) depends on beam width.
Contrast resolution (B) relates to dynamic range.
Temporal resolution (C) is tied to frame rate.
Therefore, the correct answer is D: Axial.


NEW QUESTION # 127
What would increase with an increase in acoustic power?

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The thermal index (TI) indicates the potential for tissue heating due to ultrasound energy absorption. Increasing acoustic power increases the amount of energy transmitted into the body, which raises the thermal index.
According to sonography instrumentation reference:
"An increase in acoustic output power results in a corresponding increase in the thermal index, reflecting higher potential for tissue heating." Therefore, the correct answer is C: Thermal Index.
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NEW QUESTION # 128
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