Ultrasound (also known as sonography or ultrasonography) is a diagnostic procedure that transmits high-frequency sound waves, inaudible to the human ear, through body tissues. The echoes are recorded and transformed into video or photographic images of the internal structures of the body.
Ultrasound images help in the diagnosis of a wide range of diseases and conditions. Ultrasound is used to create images of soft tissue structures, such as the gallbladder, liver, heart, kidney, female reproductive organs -- and even of fetuses still in the womb. Ultrasound can also detect blockages in the blood vessels.
Ultrasound may be used with other diagnostic procedures or by itself. Studies have shown that ultrasound is not hazardous. There are no harmful side effects. In addition, ultrasound does not use radiation, as X-ray tests do.