What is ultrasonic frequency employed for obstetric studies?(a) 0.5 to 1 MHz(b) 1 to 1.5 MHz(c) 1.5 to 2 MHz(d) 2 to 2.5 MHzThe question was asked in an international level competition.I'd like to ask this question from Recording System topic in chapter Foetal Monitoring Instruments of Biomedical Instrumentation

What is ultrasonic frequency employed for obstetric studies?(a) 0.5 to

1.	What is ultrasonic frequency employed for obstetric studies?(a) 0.5 to 1 MHz(b) 1 to 1.5 MHz(c) 1.5 to 2 MHz(d) 2 to 2.5 MHzThe question was asked in an international level competition.I'd like to ask this question from Recording System topic in chapter Foetal Monitoring Instruments of Biomedical Instrumentation
Answer» Correct option is (d) 2 to 2.5 MHz 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.

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