Radiation Dose in Pregnancy

Radiographics: Guidelines for pregancy and lactation

Xray or CT: Fetal radiation doses up to 1 mGy—used in most radiologic examinations below the knees and above the diaphragm—are considered acceptable, with an additional risk of carcinogenesis of less than one in 10,000. With larger doses (eg, a fetal dose of 20–50 mGy received during pelvic CT), the risk of carcinogenesis increases approximately by a factor of 2, although it remains low in absolute terms (less than one in 250).

MRI:  There has been no documented damage to a developing human fetus caused by MR imaging exposure. However, caution is advised, and risks and benefits must always be weighed before evaluating a pregnant patient with MR imaging.

Table 1

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