SPI Exam Dumps | Which technique averages image frames over time to reduce noise?

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ARDMS.SPI.v2025-12-29.q99
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Question 14/99

Which technique averages image frames over time to reduce noise?

A. Demodulation

B. Persistence

C. Compression

D. Time gain compensation

Correct Answer: B

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.

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