Limitations to fetal MRI include:
Current ACR recommendations regarding fetal MR safety emphasize that no present data conclusively document or reproducibly demonstrate harmful effects to the pregnant woman or the fetus. The ACR suggests that special considerations are unnecessary for fetal MR imaging at 1.5 T at any stage of pregnancy. The ACR cautions that most of the research on the potential harmful effects of fetal MR imaging has been done for magnetic fields of 1.5 or less, and that less information is available about the safety of fetal MR at field strengths of 3T. Click here to review the ACR/SPR Guidelines for Fetal MRI Safety.
The ACR further recommends that the theoretical risks must be carefully weighed against the potential benefits of the information that is obtained.