Reducing spatial pulse length improves

Reducing spatial pulse length improves

• A. Frame rate
• B. Penetration
• C. Axial resolution
• D. Lateral resolution

Answer: (C)

Spatial pulse length is the physical length of one emitted pulse in tissue. Shorter SPL means the pulse occupies less distance, so echoes from two reflectors that lie along the beam path return closer together in time but can still be distinguished. This directly improves axial resolution, which is the ability to separate structures along the direction of the beam. In practice, axial resolution is roughly half the SPL, so reducing SPL tightens the minimum separable distance along depth, giving crisper detail in the axis of the beam. Frame rate depends more on how quickly frames are acquired and depth settings, not the pulse length itself; penetration is governed mainly by frequency and attenuation; lateral resolution depends on beam width and focusing rather than the length of the pulse along the axis. So the best choice is axial resolution.

Spatial pulse length is the physical length of one emitted pulse in tissue. Shorter SPL means the pulse occupies less distance, so echoes from two reflectors that lie along the beam path return closer together in time but can still be distinguished. This directly improves axial resolution, which is the ability to separate structures along the direction of the beam. In practice, axial resolution is roughly half the SPL, so reducing SPL tightens the minimum separable distance along depth, giving crisper detail in the axis of the beam. Frame rate depends more on how quickly frames are acquired and depth settings, not the pulse length itself; penetration is governed mainly by frequency and attenuation; lateral resolution depends on beam width and focusing rather than the length of the pulse along the axis. So the best choice is axial resolution.