Obstetric dating ultrasound

Ultrasound imaging is a noninvasive medical test that helps physicians diagnose and treat medical conditions.

Obstetrical ultrasound provides pictures of an embryo or fetus within a woman's uterus, as well as the mother's uterus and ovaries.

The principles are similar to sonar used by boats and submarines.

The ultrasound image is immediately visible on a video display screen that looks like a computer or television monitor.

Doppler ultrasound, a special application of ultrasound, measures the direction and speed of blood cells as they move through vessels.

The transducer collects the sounds that bounce back and a computer then uses those sound waves to create an image.Only the lower abdominal area needs to be exposed during this procedure.The radiologist or sonographer may elect to examine an early pregnancy by means of transvaginal ultrasound in order to see the pregnancy more closely or to assess the cervix.Ultrasound devices also use Doppler, a special application of ultrasound, which processes echoes produced by blood flowing through the fetal heart, blood vessels and umbilical cord and turns them into audible sound.This sound has been described by patients as a whooshing noise.

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Some exams may use different transducers (with different capabilities) during a single exam.

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