Which region of the sound beam has a diameter that increases with distance from the transducer?

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Multiple Choice

Which region of the sound beam has a diameter that increases with distance from the transducer?

Explanation:
Diffraction causes the ultrasound beam to spread as it travels. After the focus, the beam broadens in the far field, so its cross-sectional diameter increases with distance from the transducer. The focal zone is where the beam is narrowest near the focus, giving better lateral resolution. Focal length is simply the distance to that focus, and diffraction is the underlying spreading phenomenon, not a region. So the region where the diameter grows with distance is the far field.

Diffraction causes the ultrasound beam to spread as it travels. After the focus, the beam broadens in the far field, so its cross-sectional diameter increases with distance from the transducer. The focal zone is where the beam is narrowest near the focus, giving better lateral resolution. Focal length is simply the distance to that focus, and diffraction is the underlying spreading phenomenon, not a region. So the region where the diameter grows with distance is the far field.

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