SPI Exam Dumps | Which machine setting could cause aliasing to occur?

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ARDMS.SPI.v2025-12-29.q99
Question 87

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Question 87/99

Which machine setting could cause aliasing to occur?

A. Doppler scale too high

B. Doppler scale too low

C. Doppler gain too high

D. Doppler gain too low

Correct Answer: B

Comprehensive and Detailed Explanation From Exact Extract:
Aliasing occurs when the Doppler shift exceeds the Nyquist limit, which is directly tied to pulse repetition frequency (PRF), represented on the machine as Doppler scale. A Doppler scale set too low reduces the Nyquist limit, making aliasing more likely.
According to sonography instrumentation reference:
"Aliasing occurs when Doppler scale (PRF) is set too low relative to the measured velocities, causing signal wrap-around." Therefore, the correct answer is B: Doppler scale too low.
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