For a transducer with a lateral focus at 3 cm depth, at what depth is lateral resolution best?

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Multiple Choice

For a transducer with a lateral focus at 3 cm depth, at what depth is lateral resolution best?

Explanation:
Lateral resolution is tied to the width of the ultrasound beam in the plane perpendicular to the beam. The beam is narrowest at the focus, so the finest lateral detail occurs there. With a lateral focus set at 3 cm, the beam width is smallest at that depth, giving the best lateral resolution at 3 cm. Before reaching the focus, the beam is still converging and wider, so the lateral resolution is poorer. After the focus, the beam diverges and widens again, reducing lateral resolution as well.

Lateral resolution is tied to the width of the ultrasound beam in the plane perpendicular to the beam. The beam is narrowest at the focus, so the finest lateral detail occurs there. With a lateral focus set at 3 cm, the beam width is smallest at that depth, giving the best lateral resolution at 3 cm. Before reaching the focus, the beam is still converging and wider, so the lateral resolution is poorer. After the focus, the beam diverges and widens again, reducing lateral resolution as well.

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