Answer:Ultrasound scans, or sonography mostly sonography
Explanation:
Ultrasound scans, or sonography, are safe because they use sound waves or echoes to make an image, instead of radiation. Ultrasound scans are used to evaluate fetal development
The ultrasound is used to see the pictures of inner body. It is used for the pregnant lady to see growth and development of the embryo inside the body.
It uses sound waves which is more than 20 kilohertz in healthy adults. It is also known as sonography.
A small device known as transducer and gel is used to amplify the sound waves that strikes the organs or embryo and the reflected sound waves produces a picture.
