Which frequencies are used therapeutically?

Which frequencies are used therapeutically?

• A. 1 and 3 megahertz
• B. 5 and 10 kilohertz
• C. 0.5 and 1 kilohertz
• D. 20 and 40 megahertz

Answer: (A)

Therapeutic ultrasound uses frequencies in the megahertz range, with 1 MHz and 3 MHz being the standard settings. The lower frequency (1 MHz) penetrates deeper into tissue, making it suitable for deeper structures, while the higher frequency (3 MHz) is absorbed more quickly and heats superficial tissues. Frequencies in the kilohertz range or much higher megahertz values aren’t used for typical therapeutic ultrasound, as they don’t provide the appropriate tissue heating and penetration. So, 1 and 3 megahertz are the frequencies commonly used in therapy.

Therapeutic ultrasound uses frequencies in the megahertz range, with 1 MHz and 3 MHz being the standard settings. The lower frequency (1 MHz) penetrates deeper into tissue, making it suitable for deeper structures, while the higher frequency (3 MHz) is absorbed more quickly and heats superficial tissues. Frequencies in the kilohertz range or much higher megahertz values aren’t used for typical therapeutic ultrasound, as they don’t provide the appropriate tissue heating and penetration. So, 1 and 3 megahertz are the frequencies commonly used in therapy.