SPI Exam Dumps | What is the primary factor that affects axial resolution?

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ARDMS.SPI.v2025-12-29.q99
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Question 9/99

What is the primary factor that affects axial resolution?

A. Focal zone

B. Spatial pulse length

C. Speed of sound

D. Aperture

Correct Answer: B

Comprehensive and Detailed Explanation From Exact Extract:
Axial resolution refers to the ability to distinguish two structures that are located along the path of the ultrasound beam. It is directly related to the spatial pulse length (SPL), which is the product of the number of cycles per pulse and the wavelength. A shorter SPL leads to better axial resolution.
According to sonography instrumentation reference:
"Axial resolution improves as spatial pulse length decreases because shorter pulses can better differentiate structures lying close together along the beam axis." Therefore, the correct answer is B: Spatial pulse length.
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