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ARDMS SPI Exam - Topic 1 Question 28 Discussion

Which factor improves axial resolution?
A) Shorter spatial pulse length
B) Lower frequency transducer
C) Narrower beamwidth
D) Decreased compression

ARDMS SPI Exam - Topic 1 Question 28 Discussion

Actual exam question for ARDMS's SPI exam
Question #: 28
Topic #: 1
[All SPI Questions]

Which factor improves axial resolution?

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Suggested Answer: A

Axial resolution refers to the ability to distinguish two structures that are close to each other along the direction of the sound beam. It is determined by the spatial pulse length (SPL), which is the product of the number of cycles in a pulse and the wavelength. Shorter SPL means shorter pulse duration, which leads to better axial resolution. This is because shorter pulses allow for better separation of echoes from closely spaced structures.


ARDMS Sonography Principles and Instrumentation guidelines

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

by Vivan at Jun 19, 2026, 03:16 AM

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Alethea
3 days ago
But what about D) Increased aperture size? That also enhances resolution, right?
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Terrilyn
8 days ago
I agree, shorter wavelength improves detail. A wider beam just spreads it out.
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Tammi
14 days ago
I think C) Shorter wavelength is the best choice. It helps with clarity.
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Kristofer
19 days ago
Wait, I didn't know wavelength affected resolution like that!
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Raylene
24 days ago
Not so sure about that, isn't depth of field important?
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Anika
29 days ago
Definitely C! Makes sense.
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Beatriz
1 month ago
I thought wider beam would help too?
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Aliza
1 month ago
Shorter wavelength is key!
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Thad
1 month ago
I definitely remember that shorter wavelengths lead to better resolution, so I think C is the correct choice for this question.
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Michal
2 months ago
I feel like greater depth of field might be related, but it seems more about overall focus rather than axial resolution specifically.
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Hermila
2 months ago
I practiced a similar question where increased aperture size was mentioned, but I can't recall if it directly affects axial resolution.
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Ligia
2 months ago
I think I remember something about shorter wavelengths improving resolution, but I'm not entirely sure if that's the right answer here.
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