Figure 8.

Evaluation criteria for pulmonary perfusion. Maximum intensity projection images of a single perfusion phase obtained with contrast-enhanced MR-derived pulmonary perfusion in three patients: (a) normal homogeneous perfusion (no perfusion defect), (b) bilateral diffuse non-segmental peripheral perfusion defects (typical of pulmonary arterial hypertension; white arrows) and (c) segmental or focal perfusion defect (typical of chronic thromboembolic pulmonary hypertension) in the upper right lobe (open arrow).