Technical Advances and Pitfalls in Head and Neck Radiotherapy
Figure 3
(a): Patient with locally advanced nasopharyngeal cancer showing CT simulation planning CT and a corresponding daily CBCT localization scan acquired during week 4 of treatment. Primary tumor is outlined in red. Note the interval tumor regression evident on CBCT. (b): Superimposed planning CT and CBCT demonstrating obvious anterior-posterior misalignment before then after image-guided correction.