Using high-frequency sound waves to scan the interior organs of the body, including the placenta, reproductive system, and fetus of a pregnant woman, an ultrasound, creates a picture of the baby and placenta. While sonogram and ultrasound are different medical words, they refer to the same examination and are used interchangeably. They can depict the arrangement and motion of the internal organs of the body, such as the fetus in pregnant women, the abdomen, and blood circulating through blood veins.