SPI Exam Dumps | Decreasing which parameter will improve axial resolution?

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ARDMS.SPI.v2025-12-29.q99
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Question 42/99

Decreasing which parameter will improve axial resolution?

A. Frequency

B. Bandwidth

C. Pulse length

D. Focal depth

Correct Answer: C

Comprehensive and Detailed Explanation From Exact Extract:
Axial resolution is primarily determined by the spatial pulse length (SPL), which depends on both wavelength and the number of cycles per pulse. A shorter pulse length provides better axial resolution. The Principles and Instrumentation documents state:
"Axial resolution = SPL/2. To improve axial resolution, the pulse duration must be shortened - achieved by decreasing the pulse length." Note: While increasing frequency also improves axial resolution (because it shortens wavelength), in this question, decreasing pulse length directly targets SPL, making it the most precise answer.
Therefore, the correct answer is C: Pulse length.

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