Figure 16b. Usefulness of endocardial VR images. Right (a) and left (b) VR images (endocardial view) from multi-detector row CT demonstrate normal right inferior (RI) and right superior (RS) veins and a normal left common pulmonary vein (LCV), with the ostial diameters and circumferences measured. Note the typical prominent endocardial ridge (arrowheads), which separates the left pulmonary venous vestibule from the orifice of the left atrial appendage.