why do we use ultrasounds?
<answer> Ultrasound is used instead of x-rays for certain scans. <context> Ultrasound - Higher tier. Ultrasound may be used instead of x-rays for certain scans, such as scan of unborn babies. Compared to x-ray photographs, ultrasound scans: Do not damage living cells; Produce images of soft tissue; Medical images from ultrasound. Ultrasound is sent into the patient's body. Some of the ultrasound is reflected at each boundary between different tissues or organs. The depth of each layer is calculated using the time taken for each reflected wave to return.