Lower numerical values of axial resolution indicate which of the following about the pulse?

Lower numerical values of axial resolution indicate which of the following about the pulse?

• A. Longer
• B. Shorter
• C. Not defined
• D. No change

Answer: (B)

Shorter pulse length leads to better axial resolution. Axial resolution is the smallest distance along the beam path between two reflectors that the system can distinguish, and it depends on the spatial pulse length (how long the pulse is in space). A shorter pulse has fewer cycles or a shorter wavelength, so the spatial pulse length is smaller. Because axial resolution is tied to that length, a smaller spatial pulse length means you can separate echoes that are closer together, which is expressed as a lower numerical value. So, a lower axial-resolution value indicates a shorter pulse.

Shorter pulse length leads to better axial resolution. Axial resolution is the smallest distance along the beam path between two reflectors that the system can distinguish, and it depends on the spatial pulse length (how long the pulse is in space). A shorter pulse has fewer cycles or a shorter wavelength, so the spatial pulse length is smaller. Because axial resolution is tied to that length, a smaller spatial pulse length means you can separate echoes that are closer together, which is expressed as a lower numerical value. So, a lower axial-resolution value indicates a shorter pulse.