SPI Exam Dumps | What is the effect on the Doppler spectral waveform when sampling a vessel at a greater depth?

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Question 16/99

What is the effect on the Doppler spectral waveform when sampling a vessel at a greater depth?

A. Increased aliasing

B. Higher Doppler shifts

C. Higher velocity measurements

D. Increased signal strength

Correct Answer: A

Comprehensive and Detailed Explanation From Exact Extract:
At greater depths, pulse repetition frequency (PRF) is automatically reduced due to longer pulse travel times, lowering the Nyquist limit and increasing the likelihood of aliasing.
Principles and Instrumentation state:
"As sample depth increases, PRF decreases, lowering the Nyquist limit and increasing the risk of aliasing in pulsed-wave Doppler."
* Doppler shift depends on flow velocity and angle, not depth.
* Actual velocity measurements do not increase with depth.
* Signal strength typically decreases (not increases) due to attenuation.
Therefore, the correct answer is A: Increased aliasing.

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