The quick history of Sonograms and Ultrasounds.
1794 – Lazzaro Spallanzani, a biologist, proved that bats can navigate accurately in the dark through echo reflection from high frequency inaudible sound.
1880 – Jacques and Pierre Curie discovered the piezoelectric effect, which was useful in transducers to generate and detect ultrasonic waves in air and water.
1893 – Sir Francis Galton constructed a whistle producing ultrasound.
1912 – Richardson invented the echo locator based on the idea of ultrasound used for navigation and detection of objects in the water.
1914 – Reginald Fessenden designed the first working sonar system.
1917 – Paul Langevin created the first technological application of ultrasound in an attempt to detect submarines.
1930s – The construction of pulse-echo ultrasonic metal flaw detectors.
Late 1930s – Karl Theo Dussik, a neurologist and psychiatrist, is regarded as the first physician to have employed ultrasound in medical diagnosis.
1937 – The Dussig brothers attempted to implement the ultrasound to visualize the cerebral chambers. The attempt ended with no results.
1949 – George Ludwig’s work was released to the public domain, which included his work experimenting on animal tissues using A-mode industrial flaw detector equipment. He was the first to detect and localize foreign objects in the body, specifically gallstones, using an ultrasound.
1956 – Ian Donald, an obstetrician, and Tom Brown, an engineer, developed the first prototype systems of the ultrasound machine based on an instrument used to detect flaws in industrial ships.
1958 – Brown invented the two dimensional scanner, allowing the examiner to visualize the density of the tissue.
1963 – The B (brightness) mode devices were created, allowing the examiner to visualize the two dimensional images.
1970s – The grey scale was launched, leading to the introduction of the real time ultrasound scanners.
2000s – Physical ultrasound improvements over the years include ultrasound equipment becoming smaller and more compact, generating less heat, as well as becoming more power efficient. Image quality has also improved greatly, allowing production of higher resolution ultrasound images.