Question

In echo cardiography (ECG) the frequency of the sound waves used is

• A. $20Hz$ to $20kHz$
• B. $20Hz$ to$2kHz$
• C. Beyond $20kHz$
• D. Below $20kHz$

Answer 1

The correct option is C Beyond $20kHz$

Ultrasonic frequency (greater than 20 kilohertz) is used in echocardiography. For adult cardiac imaging, ultrasound waves in the range of 4–7 MHz are used (intravascular ultrasound uses frequencies as high as 30 MHz).