Pulmonary > V-Q exam

Table 1. Estimated fetal radiation exposure from selected imaging studies

Procedure

Estimated exposure (rad)

Venography

Limited

<0.050

Limited Unilateral limb without abdominal shield

0.314

Limited Bilateral limbs without abdominal shield

0.628

Pulmonary angiography

Via femoral route

0.221-0.374

Via brachial route

<0.050

Perfusion lung scan with technetium

Tc 99m (^99mTc) MAA

3 mCi

0.018

1-2 mCi

0.006-0.012

Ventilation lung scan

Using xenon Xe 133

0.004-0.019

Using ^99mTc DTPA

0.007-0.035

Using ^99mTc SC

0.001-0.005

Chest film

<0.001

Spiral CT, chest

<0.016*

CT, computed tomography; DTPA, diethylenetriaminepentaacetic acid; SC, sulfur colloid.