Question

What is range of ultrasonic energy transmitted into the body?

(a) 0-5 mW/cm^2

(b) 5-10 mW/cm^2

(c) 10-15 mW/cm^2

(d) 15-20 mW/cm^2

This question was addressed to me in class test.

I need to ask this question from Recording System topic in portion Foetal Monitoring Instruments of Biomedical Instrumentation

Answer 1

The correct answer is (c) 10-15 mW/cm^2

The best explanation: For obstetric studies, ultrasonic frequency of about 2 to 2.5 MHz is usually employed, whereas in the study of blood flow in arteries and superficial blood vessels frequencies around 5–10 MHz are preferred. The level of ultrasonic energy transmitted into the body is generally kept between 10–15 mW/cm^2.