Quiz 2026 ARDMS SPI: Sonography Principles and Instrumentation–Reliable Exam Questions Vce

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q30-Q35):

NEW QUESTION # 30
What reduces speckle and increases visualization of specular reflectors and attenuated structures?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Speckle is a form of acoustic noise caused by interference of scattered echoes. Spatial compounding acquires multiple images from different angles and combines them to reduce speckle, enhance tissue texture, and improve visualization of structures that may otherwise be obscured by attenuation or artifact. The Principles and Instrumentation documentation states:
"Spatial compounding averages frames obtained at varying insonation angles. This reduces speckle artifact, smooths tissue texture, and improves visibility of specular reflectors and deeper structures." Therefore, the correct answer is D: Spatial compounding.
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NEW QUESTION # 31
What occurs when the pulse repetition frequency is less than twice the Doppler shift frequency?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Aliasing happens in Doppler ultrasound when the Doppler shift frequency exceeds half of the pulse repetition frequency (the Nyquist limit). When PRF is too low for the measured Doppler shift, the signal wraps around, producing aliasing.
According to sonography instrumentation reference:
"Aliasing occurs when the Doppler shift frequency exceeds one-half the pulse repetition frequency (Nyquist limit). This results in incorrect display of flow direction and velocity." Therefore, the correct answer is C: Aliasing.
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NEW QUESTION # 32
Increasing which setting could enhance the visibility of acoustic shadowing posterior to a calcified object?

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Higher frequencies are more attenuated than lower frequencies. When scanning calcified structures, increasing the frequency enhances attenuation, which makes posterior shadowing more pronounced and visible.
According to sonography instrumentation reference:
"Increasing frequency increases attenuation, thereby enhancing acoustic shadowing posterior to highly attenuating structures such as calcifications or bone." Therefore, the correct answer is D: Frequency.
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NEW QUESTION # 33
What does compression affect in the ultrasound image?

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Compression reduces the dynamic range of the returning echoes, which alters how many shades of gray are displayed. It compresses the range of signal amplitudes to fit into the grayscale display range.
According to sonography instrumentation reference:
"Compression alters the dynamic range, adjusting how many shades of gray are displayed to optimize image contrast." Therefore, the correct answer is B: The shades of gray displayed.
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NEW QUESTION # 34
Which factor determines elevational resolution?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Elevational resolution (slice thickness resolution) refers to the ability to resolve structures perpendicular to the imaging plane and is directly determined by the beam's thickness in that plane.
Principles and Instrumentation state:
"Elevational resolution is governed by the slice thickness, which depends on the transducer's beam profile and focusing in the elevational dimension." Beam depth (A) affects penetration.
Beam uniformity ratio (C) is not related.
Beam width (D) affects lateral resolution.
Therefore, the correct answer is B: Beam thickness.
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NEW QUESTION # 35
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Genuine ARDMS SPI Exam Questions [2026]

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