Sonography or ultrasound is the use of sound waves to produce an image or photograph of an organ or tissue. The ultrasound has different velocities in tissues, which differ in density and elasticity from others. This property permits the use of ultrasound in outlining the shape of various tissues and organs in the body.
An abdominal ultrasound allows for an image to be viewed through or across the abdomen. During an abdominal ultrasound, a wand (transducer) with conducting jelly is place on top of the abdomen and gently moved around to image the abdomen.