What effect does using a stand-off pad have on the focal depth?

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Multiple Choice

What effect does using a stand-off pad have on the focal depth?

Explanation:
A stand-off pad changes how the ultrasound beam travels before reaching the tissue, acting like an acoustic lens that shifts the focus toward the transducer. Because of this added tissue-like layer, the beam’s focal zone moves closer to the surface, making the focal depth more superficial. This helps image shallow structures and improves contact at the skin. It does not deepen the focus, have no effect, or increase penetration.

A stand-off pad changes how the ultrasound beam travels before reaching the tissue, acting like an acoustic lens that shifts the focus toward the transducer. Because of this added tissue-like layer, the beam’s focal zone moves closer to the surface, making the focal depth more superficial. This helps image shallow structures and improves contact at the skin. It does not deepen the focus, have no effect, or increase penetration.

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