Table 1.

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

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