Standing waves in ultrasound therapy create which of the following?

Standing waves in ultrasound therapy create which of the following?

• A. Increase in intensity and pressure
• B. Decrease in intensity
• C. No change
• D. Higher frequency only

Answer: (A)

Standing waves arise when the ultrasound wave that is transmitted reflects back from boundaries and interferes with the incoming wave, creating a pattern of nodes and antinodes. At the antinodes, constructive interference boosts the pressure and particle motion, so the local intensity increases. In other words, energy is concentrated in certain spots, producing higher intensity and pressure there, even though the overall wave frequency stays the same. This spatial redistribution can lead to hotspots and greater heating or mechanical effects at those points. The frequency itself isn’t increased by standing waves, and the energy isn’t uniformly decreased or unchanged across the tissue, which is why the best description is an increase in intensity and pressure.

Standing waves arise when the ultrasound wave that is transmitted reflects back from boundaries and interferes with the incoming wave, creating a pattern of nodes and antinodes. At the antinodes, constructive interference boosts the pressure and particle motion, so the local intensity increases. In other words, energy is concentrated in certain spots, producing higher intensity and pressure there, even though the overall wave frequency stays the same. This spatial redistribution can lead to hotspots and greater heating or mechanical effects at those points. The frequency itself isn’t increased by standing waves, and the energy isn’t uniformly decreased or unchanged across the tissue, which is why the best description is an increase in intensity and pressure.