Fig. 1From: Dosimetric comparison between proton beam therapy and photon radiation therapy for locally advanced esophageal squamous cell carcinomaAxial, sagittal, and coronal views of the dose distributions for T3Â N1 middle thoracic esophageal cancer. a PBT, b dummy plan for 3DCRT using 4 portals, c dummy plan for IMRT. The red line represents the PTV. PBT, proton beam therapy; 3DCRT, 3-dimensional conformal radiation therapy; IMRT, intensity-modulated radiation therapy; PTV, planning target volumeBack to article page