Figure 1From: Predictors for replanning in loco-regionally advanced nasopharyngeal carcinoma patients undergoing intensity-modulated radiation therapy: a prospective observational study Changes in CTV (a) and GTV (b) each week in 20 nasopharyngeal cancer patients during the course of CRT. CTV: clinical target volume; GTV: gross target volume; CRT: chemoradiotherapy. Back to article page