SPI Exam Dumps | Which adjustment produced the change from waveform A to waveform B? A close-up of a graph Description

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Sonography Principles and Instrumentation
ARDMS.SPI.v2025-12-29.q99
Question 47

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Question 47/99

Which adjustment produced the change from waveform A to waveform B?
A close-up of a graph Description automatically generated

A. Increased Doppler gain

B. Decreased Doppler gain

C. Increased wall filter

D. Decreased wall filter

Correct Answer: A

Comprehensive and Detailed Explanation From Exact Extract:
Comparing waveform A to waveform B:
* In image B, the Doppler spectral waveform is brighter, with stronger signal amplitude and more clearly visible Doppler shifts.
* This indicates that the Doppler gain was increased, amplifying the strength of the returning Doppler signals displayed on the spectral waveform.
According to official sonography Principles and Instrumentation:
"Doppler gain controls the amplification of returning Doppler signals. Increasing the gain enhances signal amplitude, making weaker Doppler signals more visible."
* Decreasing gain (B) would have produced a dimmer waveform.
* Changes in wall filter (C and D) would primarily affect low-velocity signal display, not overall brightness.
Therefore, the correct answer is A: Increased Doppler gain.

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