Ultrasound image of a fetus in the womb, viewed at 12 weeks of pregnancy (bidimensional scan). An ultrasonic examination. Fetal ultrasound. Ultrasound is sound waves with frequencies higher than the upper audible limit of human … The first technological application of ultrasound was an attempt to detect submarines. Department of Radio Diagnosis, SMS Medical College and Hospitals Joining hands with Rajasthan State Branch IRIA.