Contrast enhanced magnetic resonance angiography (MRA) is in common use in the assessment of pulmonary hypertension. We present a novel method for segmentation of the pulmonary arteries allowing rapid assessment of the proximal pulmonary arteries down to the 4th generation. Whilst the strongest correlation with mean pulmonary artery pressure was with the right main pulmonary artery, the torsion of the 4th generation pulmonary arteries was also associated with increasing mean pulmonary artery pressure. We hope quantitative vessel segmentation will improve our understanding of the impact of proximal pulmonary arterial remodelling in pulmonary hypertension.
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