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Which resolution capability is most affected by spatial pulse length?
Correct Answer: D
Axial resolution refers to the ability to distinguish two structures that are close to each other along the path of the ultrasound beam. Spatial pulse length (SPL) is the distance over which one pulse occurs, and it directly affects axial resolution. Shorter SPL improves axial resolution because it allows better differentiation of closely spaced structures. The axial resolution is improved by increasing the frequency of the transducer, which shortens the wavelength and hence the SPL. Reference: ARDMS Sonography Principles and Instrumentation guidelines on resolution parameters and their impact on image quality.
