Sonography test is a non-invasive technique in which high-frequency sound waves are made to travel inside your body to capture the live images of internal organs. This technique is also called as Ultrasound, as it is the same technique that is used in the SONAR & Radar for ships. Like other imaging tools use either invasive procedures or radiation, they become risky options for pregnant women. Therefore, sonography becomes the safest diagnostic tool for pregnant women & children for its non-invasiveness & radiation-free technique.