Chemoradiotherapy and Increased Prescription Dose in Esophageal Squamous Cell Cancer: A Retrospective Study

Figure 1

Definition of target volumes. Primary tumor gross tumor volume (GTVt) is shown as the red line. The involved regional lymph node gross tumor volume (GTVnd) is shown as the orange line. The clinical tumor volume (CTV1) is shown as a pink line. The clinical tumor volume for regional nodal volume (CTV2) is shown as the blue line. The planning gross target volume (PGTVt), planning gross tumor volume of lymph nodes (PGTVnd), planning clinical tumor volume (PTV1), and planning clinical tumor volume for regional nodal volume (PTV2) were a 0.5-centimeter expansion from GTVt, GTVnd, CTV1, and CTV2 (PTVs were not shown).