Mary, who is 6 months pregnant, goes to her physician for a test to check the development of her fetus. The physician uses a device that employs sound waves to produce an image of the fetus. This technique is known as

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The use of sound waves to produce images of the fetus is known as ultrasound. It is a common procedure used during pregnancy to monitor fetal development. X-rays, CT scans, and MRI use different techniques to produce images and are not typically used during pregnancy due to the potential risk to the developing fetus. Radiography is a general term for the use of radiation to produce images and includes X-rays, but is not a specific term for the use of sound waves to produce fetal imaging.

Mary, Who Is 6 Months Pregnant, Goes to Her Physician