Radiologic imaging during pregnancy has increased over the last 10 years. The document discusses the risks of radiation exposure to fetuses from various medical imaging procedures. It finds that deterministic effects require a threshold dose above 10 rads but stochastic effects have no threshold. Common procedures like x-rays present minimal risk while CT scans can double cancer risk for doses over 2-5 rads. MRI is not associated with radiation but may present other hazards. Contrast agents can affect the fetal thyroid so should only be used if essential. The risks and benefits of any imaging during pregnancy must be carefully considered.