If you limit the treatment area, what is the expected behavior of the waves?

If you limit the treatment area, what is the expected behavior of the waves?

• A. They spread out and do not penetrate
• B. They focus more deeply
• C. They increase energy at the skin
• D. They stop completely

Answer: (A)

Limiting the treatment area reduces the aperture from which the wave energy is emitted. A smaller aperture causes greater diffraction, so the waves spread out more as they travel. This spreading distributes energy over a larger area and lowers the intensity that reaches deeper tissues, so penetration is limited. It won’t stop completely, and it won’t increase energy at the skin; instead, the energy becomes more diffuse and less able to reach deeper targets.

Limiting the treatment area reduces the aperture from which the wave energy is emitted. A smaller aperture causes greater diffraction, so the waves spread out more as they travel. This spreading distributes energy over a larger area and lowers the intensity that reaches deeper tissues, so penetration is limited. It won’t stop completely, and it won’t increase energy at the skin; instead, the energy becomes more diffuse and less able to reach deeper targets.