What are the risks of ultrasound and MRI to the fetus?

摘要

Both ultrasound and MRI are recognized as generally safe imaging modalities and thus appropriate to be used in the diagnostics of the pregnant females and fetuses. However, to some extent, both techniques may carry some risks when used during pregnancy. To keep the fetus safe, knowledge of potential bioeffects is mandatory, as is understanding the background and the influence of particular factors for safety.