We applied parameter analysis in 4D flow imaging for pulmonary artery hypertension (PAH) and compare the MR parameters between five patients with iPAH and five healthy volunteers. Compared with healthy volunteers, patients with idiopathic PAH have more retrograde flow in MPA, enlarger area of MPA, higher peak acceleration. And Plane-to-plane variations of these parameters were evaluated using the Bland-Altman comparisons, some parameters have relatively low variations which means they can be calculated through 2D flow imaging. In conclusion, MRI results show that the effect of increased pulmonary artery pressure and resistance has influence the flow in MPA.
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