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Table 1 Risk of fetal radiation exposure resulting from radiological studies in the pregnant patient with respiratory failure

From: Clinical review: Ventilatory strategies for obstetric, brain-injured and obese patients

Investigation Fetal radiation exposure (mGy)
Chest X-ray (with abdomen shielded) 0.01
Ventilation–perfusion scan  
   Perfusion 0.1 to 1.0
   Ventilation 0.1 to 0.4
Computed tomography pulmonary angiogram 0.1 to 1.0
Computed tomography pelvis and abdomen 30 to 50
Radiation effect on the fetus  
   Teratogenicity 50 to 100
   Oncogenicity 20 to 50