There is no harm for MRI (magnetic resonance imaging) during
pregnancy because it does not emit radiation. Rarely, some anomalies in the
baby can be used for diagnostic purposes.
Computed tomography (CT, CAT) can be harmful for the baby
when applied too much in pregnancy because it emits radiation in the amounts
listed below. It is not withdrawn during pregnancy, unless it is urgent and
vitally important for the mother. While no harm from exposure to radiation
below 5 rad (5000 mrad) during pregnancy has been shown, various radiation
related damages may occur above this dose.
The dose
(mrad) to which the fetus is exposed on computed tomography:
- Chest CT (Computed tomography): 30 mrad
- Abdominal CT (Computed tomography): 250 mrad
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