Ultrasound is a diagnostic imaging procedure that allows you to view organs and soft structures within the body. It is made using high-frequency sound waves that are emitted by a transducer that captures the echo of different amplitudes which occurs bounce off the organs. These signals, when processed by a computer, give a series of images of the tissues examined. Today may be two-dimensional, three-dimensional or 4-dimensional images. Ultrasound is a noninvasive technique, in which no radiation used and thus is used to visualize fetuses that are being formed. This procedure can differentiate clearly the shape and size of each structure within the body. In medicine it is used to see the heart, kidneys, liver and blood vessels, among other organs.