The document provides guidelines for diagnostic imaging during pregnancy from the American College of Obstetricians and Gynecologists. It states that exposure to less than 5 rads of radiation from a single x-ray procedure is not associated with increased risks of fetal anomalies or loss. Ultrasonography and MRI are the preferred imaging methods during pregnancy as they have no known adverse fetal effects. Contrast agents may be used if the diagnostic benefit outweighs the potential risk to the fetus.