Although this test uses radioactive materials, the total amount of radiation exposure is low. Typical effective doses for a<unk>  range from 1-5 mSv. In order to decrease the radiation exposure in pregnant patients, the total radioactivity administered may be decreased or the<unk>  phase omitted. A CT pulmonary angiogram (CTPA) with radiocontrast can alternatively be performed, although this can result in a greater radiation dose to the patient.
Ventilation/perfusion scan
Carbon dioxide angiography
Perfusion scanning
Intravascular fluorescence
Intravascular imaging
Microangiography
Pulmonary angiography
Digital subtraction angiography