Ultrasound is a non-invasive procedure that uses sound waves in the assessment of body structures. A gel is applied to the skin over the area to be scanned. An ultrasound transducer is then passed along the skin surface. The transducer produces sound waves that get reflected from the body tissues in the form of echoes. The transducer then collects the echoes which are turned into a signal and then processed by a computer into detailed images. Ultrasound is commonly used to look at abdominal and pelvic organs. Obstetrics is another common use for ultrasound as there is no radiation and no known harmful effects. One of the newest uses of ultrasound is the scanning of musculo-skeletal structures. Tendons and structures around joints are typically well demonstrated with ultrasound. Ultrasound procedures are performed by qualified Ultrasound technologists. This procedure uses no radiation.