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ARDMS Exam SPI Topic 3 Question 12 Discussion

Actual exam question for ARDMS's Sonography Principles and Instrumentation exam
Question #: 12
Topic #: 3
[All Sonography Principles and Instrumentation Questions]

Which of these modes has the highest duty factor?

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Suggested Answer: A

The duty factor is the fraction of time that the ultrasound system is actively transmitting a signal. Continuous wave (CW) Doppler has the highest duty factor because it continuously transmits and receives ultrasound waves. Unlike pulsed wave Doppler, which alternates between sending and receiving signals, CW Doppler does not have a listening period, resulting in a duty factor of nearly 100%. Therefore, CW Doppler has the highest duty factor among the modes listed.


ARDMS Sonography Principles & Instrumentation Guidelines

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

by Roy at Aug 22, 2024, 11:29 PM

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Annice
12 days ago
B) Pulsed wave Doppler, hands down. It's the one that really gives it 'one hundred percent', you know?
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Oren
15 days ago
D) Gray-scale, definitely. I mean, who doesn't love a good grayscale image? It's the most duty-ful of them all!
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Stanton
17 days ago
Wait, isn't the duty factor related to the pulse width and pulse repetition frequency? If that's the case, then B) Pulsed wave Doppler is the correct answer.
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Geraldine
3 days ago
So, the highest duty factor would be in Pulsed wave Doppler then.
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Jaime
8 days ago
I think you're right, duty factor is indeed related to pulse width and pulse repetition frequency.
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Marguerita
29 days ago
I believe the correct answer is A) Continuous wave Doppler because it has continuous transmission of ultrasound waves.
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Shawna
29 days ago
I'm pretty sure it's A) Continuous wave Doppler. I mean, it's constantly emitting waves, so the duty factor has to be the highest.
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Jillian
13 days ago
Yeah, Continuous wave Doppler makes sense since it's constantly emitting waves.
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Glenn
16 days ago
I think you're right, A) Continuous wave Doppler does have the highest duty factor.
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Giovanna
1 months ago
I'm not sure, but I think Continuous wave Doppler may also have a high duty factor.
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Teri
1 months ago
Definitely B) Pulsed wave Doppler. That's the one with the highest duty factor, right?
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Rosalyn
14 days ago
Actually, it's Pulsed wave Doppler. It has the highest duty factor.
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Dortha
20 days ago
I think it's Continuous wave Doppler.
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Leslie
22 days ago
Yes, you're correct. Pulsed wave Doppler has the highest duty factor.
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Casie
1 months ago
I agree with Dean, Pulsed wave Doppler has a higher duty factor.
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Dean
1 months ago
I think the answer is B) Pulsed wave Doppler.
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