What is the typical intensity range used in therapeutic ultrasound?

What is the typical intensity range used in therapeutic ultrasound?

• A. 0.1-0.5 W/cm2
• B. 1.0-2.0 W/cm2
• C. 0.5-3.0 W/cm2
• D. 5.0-6.0 W/cm2

Answer: (C)

Therapeutic ultrasound delivers energy to tissues to create heating or non‑thermal effects, and the intensity (energy per area per time) guides how much heating you get. Clinically, the typical range used is 0.5 to 3.0 W/cm². This broad span covers mild heating (around 0.5–1.0 W/cm²) and deeper or more substantial heating (up to about 3.0 W/cm²) when appropriate for the tissue and treatment goals. Going below 0.5 W/cm² usually doesn’t produce meaningful therapeutic heating, while intensities above 3 W/cm² raise the risk of tissue damage and are not commonly used. The duty cycle also matters: pulsed ultrasound reduces average heating, so higher peak intensities can be used with shorter on-times without as much heating.

Therapeutic ultrasound delivers energy to tissues to create heating or non‑thermal effects, and the intensity (energy per area per time) guides how much heating you get. Clinically, the typical range used is 0.5 to 3.0 W/cm². This broad span covers mild heating (around 0.5–1.0 W/cm²) and deeper or more substantial heating (up to about 3.0 W/cm²) when appropriate for the tissue and treatment goals. Going below 0.5 W/cm² usually doesn’t produce meaningful therapeutic heating, while intensities above 3 W/cm² raise the risk of tissue damage and are not commonly used. The duty cycle also matters: pulsed ultrasound reduces average heating, so higher peak intensities can be used with shorter on-times without as much heating.