Dynamic focusing provides what benefit to image quality?

• A. It increases sequence number of frames
• B. It improves lateral resolution across depths and stabilizes beamwidth
• C. It only affects axial resolution
• D. It reduces beam quality

Answer: (B)

Dynamic focusing adjusts the timing delays across the array as the sound travels, so the beam remains focused at different depths rather than at a single point. This keeps the beam narrow over a wide range of depths, which directly improves lateral resolution and makes the beamwidth more uniform as you image deeper. In practice, this means crisper, more consistent detail side-to-side throughout the image. Axial resolution depends mainly on pulse length and bandwidth, not on focusing strategy, and dynamic focusing doesn’t aim to increase frame rate or worsen beam quality.