Answer:
Echocardiography uses ultrasound emitted from a probe. The sound is then reflected back to the probe when it encounters a solid object. The results are compiled with a computer. X-rays, optical equipment or radar (using radio waves) are not used.
Explanation:
The device transmits high-frequency sound waves. The transducer detects the echoes of the sound waves and transmits them as electrical impulses. The echocardiography machine converts these impulses into moving images of the heart. Still images are also taken.
