What is Ultrasound Imaging (Sonography or Ultrasonography)?
Ultrasound is sound waves with frequencies which are higher than those audible to humans (>20,000 Hz). Ultrasonic images also known as sonograms are made by sending pulses of ultrasound into tissue using a probe. The sound echoes off the tissue; with different tissues reflecting varying degrees of sound. These echoes are recorded and displayed as an image to the operator.
Medical ultrasound (also known as diagnostic sonography or ultrasonography) is a diagnostic imaging technique based on the application of ultrasound. It is used to see internal body structures such as tendons, muscles, joints, vessels and internal organs. Its aim is often to find a source of a disease or to exclude any pathology. The practice of examining pregnant women using ultrasound is called obstetric ultrasound, and is widely used.
In the late 1940s, George Ludwig, while serving at the Naval Medical Research Institute in Maryland, used ultrasound to detect gallstones.
English-born physicist John Wild first used ultrasound to assess the thickness of bowel tissue as early as 1949; he has been described as the "father of medical ultrasound"