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ARDMS SPI Exam - Topic 4 Question 23 Discussion

Which is a method to reduce noise?
D) Increase persistence
A) Increase frequency
B) Decrease beam width
C) Decrease depth

ARDMS SPI Exam - Topic 4 Question 23 Discussion

Actual exam question for ARDMS's SPI exam
Question #: 23
Topic #: 4
[All SPI Questions]

Which is a method to reduce noise?

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Suggested Answer: D

Persistence is a form of temporal averaging where consecutive frames are averaged to reduce random noise, resulting in a smoother image. Increasing persistence effectively reduces noise by averaging out transient noise artifacts while preserving the true signal. This improves image quality, although it may also reduce the temporal resolution, making it less suitable for rapidly moving structures.


ARDMS Sonography Principles & Instrumentation Guidelines

Hedrick WR, Hykes DL, Starchman DE. Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA: Elsevier Saunders; 2005.

by Refugia at Mar 30, 2026, 09:34 AM

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Mila
I think B is the best choice. Decreasing beam width helps focus the signal.
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Bev
5 days ago
Decreasing depth doesn't seem right for noise reduction.
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Oneida
10 days ago
Wait, can increasing persistence really reduce noise?
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Gianna
15 days ago
Totally agree with decreasing beam width!
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Deeanna
2 months ago
I thought increasing frequency would help too?
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Han
2 months ago
Decreasing beam width helps reduce noise!
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Kenneth
3 months ago
Increasing frequency seems like it could help, but I’m not confident that it’s the best method for noise reduction.
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Lorita
3 months ago
I feel like we practiced a question similar to this, and I think decreasing depth was not the right answer.
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Jolene
3 months ago
I remember something about beam width affecting resolution, but I can't recall if decreasing it actually reduces noise.
upvoted 0 times
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Keith
3 months ago
I think increasing persistence might help reduce noise, but I'm not entirely sure how it works in practice.
upvoted 0 times
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