Figure 1

A) Three surface models loaded; the right side of the heart (blue) is contour rendered, the left side of the heart (red) is solid rendered, allowing us to visualize the relationship between the stenotic pulmonary artery and the left coronary arteries (arrow). B) Volume rendered image with clip plane, showing the area of the stenosis (arrow). The relationship between the stenosis and the pulmonary artery ostia cannot be visualized. C) Solid rendered surface cut open using a "carving" technique to visualize the relationship between the stenosis (yellow arrow) and the right pulmonary artery ostium (purple arrow).