Figure 3.

Summary of cone‐beam computed tomography (CBCT) correction results in one brain patient. The first column shows various views of the planning CT images, the second column shows corresponding views of the original CBCT image, the third column shows the corrected CBCT image, and fourth and fifth columns show the CBCT error and CCBCT error, respectively. For error images, the planning CT was taken as the ground truth. The planning CT is taken as the ground truth for error calculations. The top row shows an axial slice of the patient, with the highlighted insert shown directly below. The final column shows the difference image between the CBCT and CCBCT. A sagittal slice is shown with an ROI in pharynx shown below. [Color figure can be viewed at wileyonlinelibrary.com]