What is the current understanding of the effects of MRI on fetuses?

The current understanding of the effects of MRI on fetuses is that while there are still ongoing studies to fully understand its implications, MR imaging generally may be safely used when non-ionizing alternatives, such as ultrasound, are inadequate for diagnosing conditions during pregnancy.

MRI uses non-ionizing radiation, which does not involve harmful ionizing radiation like X-rays or CT scans. This aspect makes MRI a favorable option for imaging when quality diagnostic information is required, especially in cases where other imaging modalities may not provide sufficient data or may not be suitable. Research has indicated that no significant harmful effects have been proven at the recommended usage levels, particularly during the second and third trimesters.

It's important to note that while MRI is considered relatively safe, it is generally advised to weigh the benefits against any potential risks. Thus, using MRI in pregnancy is a well-considered decision made by healthcare providers, especially when non-invasive alternatives are not sufficient for appropriate clinical evaluation.