the.com/echocardiography
Sonar for the heart, proving your most dramatic organ is just plumbing with a beat.
means An ultrasound test that uses sound waves to image the heart's chambers, valves, and pumping action in real time.
from From Greek ekho (sound, the nymph who could only echo) plus kardia (heart) plus graphein (to write) — literally writing the heart with returned sound.
Same techIdentical principle to bat navigation and submarine sonar.
Doppler trickColor shows blood direction by shifting sound frequency.
No radiationPure sound waves, safe enough for fetal hearts.