Severe Pulmonary Arterial Hypertension: Comprehensive Evaluation by Magnetic Resonance Imaging

Figure 6

(a) MRI velocity-encoding magnitude (top) and phase (bottom) flow images through the main pulmonary artery at different time points during early systole. The images show a dilated pulmonary artery (PA), which appears larger than the aorta (Ao). The PA shows negligible change in cross-sectional area despite the flow increase with time (shown in the phase images). (b) MRI velocity-encoding magnitude (top) and phase (bottom) flow images through the tricuspid valve at end systole showing severe tricuspid regurgitation (arrows). LV = left ventricle; RV = right ventricle.

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