Question

What is the frequency range of the sound used for ultrasound diathermy?

(a) 0.1 – 0.7 MHz

(b) 0.7 – 3.3 MHz

(c) 3.3 – 5 MHz

(d) 5 – 15 MHz

I got this question in final exam.

My question is from Diathermy, Measurement of Radiation, Dose and its Calculations topic in chapter Radiation Therapy of Clinical Science

Answer 1

The correct option is (b) 0.7 – 3.3 MHz

Best explanation: The ultrasound treatment can penetrate up to 2 – 5 cm deep within the skin to relieve pain. The frequency of 0.7 – 3.3 MHz is used. If the frequency is increased, it can cause excess heat causing heat burns in the body and doing damage rather than therapy.