What is ultrasound? "Ultra" is a Latin word meaning “beyond,” or “on the far side of,” so “ultrasound” simply means sound which is too high for humans to hear. This is typically considered to encompass frequencies above 20 kHz (20,000 cycles per second). The hearing of dogs and bats extends into this ultrasonic range. Ultrasound is a wave, like light or radio waves. It’s … [Read more...] about Ultrasound Expert Witness: What Ultrasound is and How It Works