If one is concerned about the potentially damaging effects of radiation, and the relative safety of ultrasound technology springs to mind, then one may be also interested in reading more about the apparently forbidden topic of ultrasound safety studies, if such a person can get past the cognitive dissonance from having been told the consensus opinion on how safe ultrasound is, e.g.:

https://www.amazon.com/Studies-Conducted-Indicate-Prenatal-U...

https://www.westonaprice.org/book-reviews/50-human-studies-j...

http://whale.to/c/50_human_studies.html

https://harvoa.substack.com/p/dbr

The jury may still be out?