SPI Exam Dumps | Which function can decrease noise?

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ARDMS.SPI.v2025-12-29.q99
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Question 15/99

Which function can decrease noise?

A. Frequency

B. Sector width

C. Depth

D. Persistence

Correct Answer: D

Comprehensive and Detailed Explanation From Exact Extract:
Persistence is a frame averaging function that combines multiple sequential frames to smooth random noise and reduce speckle, particularly effective in stationary or slow-moving structures.
According to official Principles and Instrumentation guidelines:
"Persistence reduces random noise by averaging multiple frames over time, improving image clarity but potentially reducing temporal resolution." A: Increasing frequency improves resolution but may increase attenuation.
B: Sector width affects frame rate.
C: Depth affects penetration but not noise reduction.

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