Continuous ultrasound is...

Continuous ultrasound is...

• A. Pulsed energy with rest intervals
• B. Energy constant 100% of the treatment time
• C. Intermittent energy
• D. Applied only at very low intensity

Answer: (B)

Continuous ultrasound means the energy is delivered without interruption for the entire treatment time, giving a 100% duty cycle. This continuous delivery produces heating in the tissue, which is the thermal effect sought during modalities that use continuous ultrasound. In contrast, pulsed ultrasound turns on and off, with rest intervals, to reduce heating and emphasize non-thermal effects. So the statement describing energy constant for the full treatment time best fits continuous ultrasound. The idea that it must be at very low intensity is not a defining feature, since continuous ultrasound can be used at a range of intensities; the key is that it remains on without interruptions.

Continuous ultrasound means the energy is delivered without interruption for the entire treatment time, giving a 100% duty cycle. This continuous delivery produces heating in the tissue, which is the thermal effect sought during modalities that use continuous ultrasound.

In contrast, pulsed ultrasound turns on and off, with rest intervals, to reduce heating and emphasize non-thermal effects. So the statement describing energy constant for the full treatment time best fits continuous ultrasound. The idea that it must be at very low intensity is not a defining feature, since continuous ultrasound can be used at a range of intensities; the key is that it remains on without interruptions.