If ultrasound is applied at a lower intensity, what adjustment is suggested?

If ultrasound is applied at a lower intensity, what adjustment is suggested?

• A. Increase the amount of time
• B. Increase the intensity
• C. Shorten treatment duration
• D. Use higher frequency

Answer: (A)

When using therapeutic ultrasound, the tissue dose depends on the total energy delivered, which is the product of intensity and time (and, for pulsed ultrasound, the duty cycle also plays a role). If you drop the intensity, you can still deliver the same overall energy by lengthening the exposure time. For instance, if you halve the intensity, you’d typically double the treatment duration to maintain the same energy dose to the tissue, assuming other factors stay constant and you stay within safety limits. Increasing intensity would change the dose rather than compensate for a lower one, shortening the time reduces the energy delivered, and using a higher frequency mainly affects how deeply the energy penetrates and how it’s absorbed, not the dose to compensate a lower intensity.

When using therapeutic ultrasound, the tissue dose depends on the total energy delivered, which is the product of intensity and time (and, for pulsed ultrasound, the duty cycle also plays a role). If you drop the intensity, you can still deliver the same overall energy by lengthening the exposure time. For instance, if you halve the intensity, you’d typically double the treatment duration to maintain the same energy dose to the tissue, assuming other factors stay constant and you stay within safety limits. Increasing intensity would change the dose rather than compensate for a lower one, shortening the time reduces the energy delivered, and using a higher frequency mainly affects how deeply the energy penetrates and how it’s absorbed, not the dose to compensate a lower intensity.