Figure 1From: Local failure patterns for patients with nasopharyngeal carcinoma after intensity-modulated radiotherapyDelineation of target volumes. (a) The gross recurrent tumor volume (GTVr) was identified on MRI images. (b) The GTVr was transferred to the original planning CT. Red line is gross tumor volume (GTV); yellow line, CTV1; blue line, CTV2. (c) Cyan line, TG; orange line, TC1; green line, TC2; purple line, TE; TG+TC1+TC2+TE=GTVr.Back to article page