Which term describes the region beyond the focus?

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Multiple Choice

Which term describes the region beyond the focus?

Explanation:
Beyond the focus the beam enters the far field, also called the far zone. In this region the ultrasound beam starts to diverge and its width increases with depth, which means the lateral resolution tends to worsen as you go deeper. The near field (Fresnel zone) is the portion before the focus where the beam is still converging, and the focal zone is the area around the focus where the beam is narrowest. Because the question asks for the region after the focus, the far zone is the correct term.

Beyond the focus the beam enters the far field, also called the far zone. In this region the ultrasound beam starts to diverge and its width increases with depth, which means the lateral resolution tends to worsen as you go deeper. The near field (Fresnel zone) is the portion before the focus where the beam is still converging, and the focal zone is the area around the focus where the beam is narrowest. Because the question asks for the region after the focus, the far zone is the correct term.

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