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ARDMS SPI Exam - Topic 3 Question 20 Discussion

Actual exam question for ARDMS's SPI exam
Question #: 20
Topic #: 3
[All SPI Questions]

What determines the resonant frequency of a pulsed wave transducer?

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Suggested Answer: D

The resonant frequency of a pulsed wave transducer is determined by the thickness of the piezoelectric element and the speed of sound within that element. The resonant frequency is inversely proportional to the element thickness and directly proportional to the speed of sound in the material. Thinner elements and higher sound speeds result in higher resonant frequencies, while thicker elements and lower sound speeds result in lower resonant frequencies. Reference:

ARDMS Sonography Principles and Instrumentation guidelines

Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.


by Nilsa at Jan 05, 2026, 05:16 AM

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Coral
24 hours ago
Definitely C! Can't believe people think otherwise.
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Talia
6 days ago
I think it's actually element diameter and thickness.
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Ayesha
11 days ago
It's all about element thickness and speed of sound!
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Henriette
16 days ago
Ah, the age-old question of pulsed wave transducer resonance. I'll go with B. Element diameter and speed of sound in element. Gotta love those physics formulas!
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Carissa
22 days ago
I'm going with C. Element diameter and element thickness. Sounds about right to me.
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Pok
27 days ago
D. Element thickness and speed of sound in element. Easy peasy, lemon squeezy!
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Maryln
2 months ago
Hmm, I'm not sure about this one. Maybe B? Element diameter and speed of sound in element?
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Stephaine
2 months ago
C. Element diameter and element thickness seems like the right choice to me.
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Marsha
2 months ago
I think the answer is D. Element thickness and speed of sound in element.
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Carey
2 months ago
I feel like the answer has to do with both thickness and diameter, but I’m confused about how they interact with the speed of sound.
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Nan
2 months ago
I practiced a similar question where element thickness was mentioned, but I can't remember if speed of sound was included in that one.
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Trinidad
2 months ago
I remember something about element diameter affecting the frequency, but I can't recall if it was just that or if thickness plays a role too.
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Edmond
3 months ago
I think the resonant frequency is influenced by the element thickness, but I'm not sure about the other factors.
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Lon
3 months ago
I'm pretty confident it's D. The thickness and speed of sound in the material are the key factors that set the resonant frequency. Gotta remember that for the exam.
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Rosann
3 months ago
Ugh, I hate these transducer questions. The formulas always get me mixed up. I'm just gonna guess and hope for the best.
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Garry
3 months ago
Okay, I've got this. The resonant frequency is all about the properties of the transducer element itself, not the pulse repetition. So it's gotta be either C or D.
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Jonelle
3 months ago
Hmm, I'm not sure about this one. I'll need to think it through carefully. Maybe I can eliminate some of the options first.
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Kasandra
3 months ago
I think it's D. The element thickness and speed of sound in the element should determine the resonant frequency.
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