When focusing, what happens to the focal zone size?

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Multiple Choice

When focusing, what happens to the focal zone size?

Explanation:
Focusing concentrates the ultrasound energy into a tighter beam at a specific depth, so the beam width is minimized in that region and nearby. The focal zone is the depth range where the beam remains narrow enough to provide good lateral resolution. When you focus, that narrow region becomes smaller, meaning the focal zone size decreases. Outside this focused area, the beam widens again, so resolution worsens beyond the focal zone.

Focusing concentrates the ultrasound energy into a tighter beam at a specific depth, so the beam width is minimized in that region and nearby. The focal zone is the depth range where the beam remains narrow enough to provide good lateral resolution. When you focus, that narrow region becomes smaller, meaning the focal zone size decreases. Outside this focused area, the beam widens again, so resolution worsens beyond the focal zone.

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