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Medical ultrasound (also known as diagnostic sonography or ultrasonography) is a diagnostic imaging technique based on the application of ultrasound. It is used to see internal body structures such as tendons, muscles, joints,blood vessels and internal organs. Its aim is often to find a source of a disease or to exclude any pathology.
Enroll Now. An ultrasound exam is a procedure that uses high-frequency sound waves to scan a womanâs abdomen and pelvic cavity, creating a picture (sonogram) of the baby and placenta.Although the terms ultrasound and sonogram are technically different, they are used interchangeably and reference the same exam.ltrasound dating of conception is not reliable for determining paternity because the ultrasound can be off by at least 5-7 days in early pregnancy. You may have an ultrasound between 18 to 20 weeks to evaluate dates, a multiples pregnancy, placenta location or complications.