Axial resolution is improved by using which change to the spatial pulse length?

Axial resolution is improved by using which change to the spatial pulse length?

• A. Longer spatial pulse length
• B. Higher frequency
• C. Shorter spatial pulse length
• D. Greater depth

Answer: (C)

Axial resolution is determined by the spatial pulse length. The shorter the pulse length along the beam, the closer two reflectors along the axis can be and still be distinguished as separate echoes. A shorter spatial pulse length reduces the distance over which echoes overlap, sharpening detail along the beam path. Since axial resolution improves when the spatial pulse length is shortened, making the pulse shorter is the correct change. Longer spatial pulse length would blur closely spaced features, and depth or simply using higher frequency doesn’t directly specify shortening the pulse length itself (though higher frequency can contribute to a shorter SPL by shortening wavelength).

Axial resolution is determined by the spatial pulse length. The shorter the pulse length along the beam, the closer two reflectors along the axis can be and still be distinguished as separate echoes. A shorter spatial pulse length reduces the distance over which echoes overlap, sharpening detail along the beam path. Since axial resolution improves when the spatial pulse length is shortened, making the pulse shorter is the correct change. Longer spatial pulse length would blur closely spaced features, and depth or simply using higher frequency doesn’t directly specify shortening the pulse length itself (though higher frequency can contribute to a shorter SPL by shortening wavelength).