Measurement of main pulmonary artery (MPA), right pulmonary artery (RPA), ascending aorta (AAo), and descending aorta (DAo) diameters at the level of the pulmonary artery bifurcation.Note: MPA diameter =31.6 mm, RPA diameter =26.6 mm, AAo diameter =32.7 mm, and DAo diameter =26.6 mm.