Which term describes the region around the focus where energy is concentrated and the beam is narrow?

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Multiple Choice

Which term describes the region around the focus where energy is concentrated and the beam is narrow?

Explanation:
In ultrasound, the beam is most concentrated and remains narrow not at a single point but in a region around the focus. This region is called the focal zone. The focal point is just the specific location of maximum energy, whereas the focal zone extends a short distance on either side where the beam diameter stays small and energy stays concentrated, giving better lateral resolution. The near field and far field describe parts of the beam before and after this region, where the beam is not narrowly focused in the same way. So, the region around the focus where energy is concentrated and the beam is narrow is the focal zone.

In ultrasound, the beam is most concentrated and remains narrow not at a single point but in a region around the focus. This region is called the focal zone. The focal point is just the specific location of maximum energy, whereas the focal zone extends a short distance on either side where the beam diameter stays small and energy stays concentrated, giving better lateral resolution. The near field and far field describe parts of the beam before and after this region, where the beam is not narrowly focused in the same way. So, the region around the focus where energy is concentrated and the beam is narrow is the focal zone.

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