Fig. 1.

Application of the windowing technique to address metal artifacts in a patient with postoperative spine CT. a) The unprocessed axial section – artifacts are noted around the pedicle screw. The oval region of interest (ROI) tool has been placed over the pedicle screw, it's HU values are displayed in the green text. b) The oval ROI tool has been positioned over the vertebral body, the corresponding HU values are displayed. c) The window width has been adjusted. d) The window level has been adjusted e) The final image, showing reduction of metal artifacts.