Fig. 1.

Retrospective flow quantification using 4-D flow reconstructed 3-D phase-contrast MR angiography data. a Location of analysis planes in the aorta and pulmonary system used for planar flow quantification. Four 2-D analysis planes were manually positioned in the aortic and pulmonary systems. b Volumetric analysis for the identification of peak blood flow velocities in the aorta and MPA. Ao aortic root (a), Ao aortic root/ascending aorta (b), MPA main pulmonary artery, RPA/LPA right/left pulmonary arteries