Figure 1

Illustration of the imaging planes used to measure blood flow by through-plane velocity-encoded phase-contrast CMR in the pulmonary artery and each of the four pulmonary veins (p. v.) in a representative subject. Five pairs of images connected by a black arrow are shown, one pair for each vessel. The left image in each pair is an image prescribed along the long-axis of the vessel and the white arrow indicates the direction of blood flow through the vessel. The right image is the modulus image for the velocity-encoded image prescribed perpendicular to the vessel, and the cross section of the vessel of interest is indicated by the arrow head. The orange lines in each image illustrate the intersection of the paired imaging planes, respectively.