2023 Mar 20. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan–.
The development of sonography or medical ultrasound was built on the understanding and research of sound, which can be dated as far back as the 6th century. Specifically, sonography can be tied to as far back as the 1700s, an Italian physicist, Lazaro Spallanzani, who was researching the navigation of bats. In the early 20th century, more applicable uses of ultrasound were studied by French physicist Paul Langevin who eventually laid the groundwork for SONOR (Sound Navigation and Ranging) as he was commissioned to investigate the sunken Titanic.