[Roots]

I don't have experience, how does that pertain to the safety of sonogram machines?

"Dangers of Ultrasound

There have been disputes whether ultrasound is safe. But since ultrasound is energy [sound waves], there are questions such as, "What are the energy waves doing to my tissue?" There are some reports of low birth weight babies being born to mothers who had more than the recommended ultrasound examination.

There may be side-effects of the following:

* Heat development: Local tissue absorb the ultrasound energy and increases the temperature of those tissues
* Bubble formation: Gasses, that are dissolved, come out of the solution due to local heat increases

However, there are no substantiated side-effects documented in studies."

[kstewskis]

There may be side-effects of the following:

* Heat development: Local tissue absorb the ultrasound energy and increases the temperature of those tissues

That's a big issue right there. Ultrasound waves can generate excess heat if it's not used properly, or if one does not understand the mechanics of how ultrasound energy transfers to a picture.

If he doesn't know what he's doing, while setting the machine on the appropriate (and safe)parameters in order to see the fetus, he might end up cooking that kid, as well as damage surrounding tissues of his wife.