Fig. 2From: Comparison of carina-based versus bony anatomy-based registration for setup verification in esophageal cancer radiotherapyOverlay of the pCT (purple) and CBCT (green) in XVI for patient 9. Arrows indicate fiducial markers, registered on the bony anatomy (left column) and the carina (right column). In axial (a), sagittal (b), and coronal view (c). First row = general carina image in coronal view. A = anterior, R = right, L = left, and F = inferior. Red contour = PTV, blue contour = CTVBack to article page