Figure 2From: Evaluation of inter-fraction and intra-fraction errors during volumetric modulated arc therapy in nasopharyngeal carcinoma patientsDistribution of differences between pre- or post-correction cone-beam computed tomography scans and planning CT scans. (a), (b) and (c) show the distribution of setup errors in the medial–lateral, superior–inferior and anterior–posterior directions, respectively.Back to article page