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. Author manuscript; available in PMC: 2016 Aug 3.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2015 Mar 5;92(2):284–291. doi: 10.1016/j.ijrobp.2015.01.005

Fig. 2.

Fig. 2

(A) The initial Proton Collaborative Group protocol included the clinical target volume contoured to the edge of the esophagus, with expansion causing planning target volume (red color wash) overlap with the esophagus (yellow color wash). (B) The protocol was later modified to minimize planning target volume expansion and overlap around the esophagus.