Sonography uses high-frequency sound waves to provide your doctor with a digital image of the inside of your body. Sonograms are most often used to diagnose conditions that impact the soft tissues of the body. Sonograms are visual images of your organs, blood flow, and tissue to help your healthcare provider examine blood vessels, abdomen, breasts, reproductive organs, heart, and the prostate, as well as other parts of the body. Sonograms are used during pregnancy to monitor fetal development and ensure that babies develop healthily and at a normal rate.