What is the recommended intensity range for superficial wounds when using pulsed ultrasound at 20% duty cycle?

What is the recommended intensity range for superficial wounds when using pulsed ultrasound at 20% duty cycle?

• A. 0.5 to 1.0 W/cm2
• B. 0.1 to 0.3 W/cm2
• C. 1.5 to 2.0 W/cm2
• D. 2.0 to 3.0 W/cm2

Answer: (A)

Pulsed ultrasound delivers energy in on-and-off cycles, so the duty cycle tells you how much time the ultrasound is actually active and influences how much heating occurs. For superficial wounds you want enough energy to help tissue healing without causing heat damage, so using a moderate peak intensity with a short on-time is appropriate. At a 20% duty cycle, a peak intensity in the range of 0.5 to 1.0 W/cm² provides the needed nonthermal effects—like improved cell membrane activity and microcirculation—without excessive heating. Higher intensities (1.5 to 3.0 W/cm²) risk overheating superficial tissue even with a 20% duty cycle, while very low values (0.1 to 0.3 W/cm²) may be insufficient to promote healing.

Pulsed ultrasound delivers energy in on-and-off cycles, so the duty cycle tells you how much time the ultrasound is actually active and influences how much heating occurs. For superficial wounds you want enough energy to help tissue healing without causing heat damage, so using a moderate peak intensity with a short on-time is appropriate. At a 20% duty cycle, a peak intensity in the range of 0.5 to 1.0 W/cm² provides the needed nonthermal effects—like improved cell membrane activity and microcirculation—without excessive heating. Higher intensities (1.5 to 3.0 W/cm²) risk overheating superficial tissue even with a 20% duty cycle, while very low values (0.1 to 0.3 W/cm²) may be insufficient to promote healing.