From what I understand, @cindiwass, ultrasounds use non-ionizing radiation. Whereas most x-rays and other tests use ionizing radiation. Here is some information about ultrasounds from the FDA website:
https://www.fda.gov/radiation-emitting-products/medical-imaging/ultrasound-imaging#benefitsrisks
Ultrasounds are used on pregnant women to check on the status of the unborn baby.

Jump to this post