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Dose-volume histograms (DVH) comparing esophageal (4a), stomach (4b), and planning target volume (PTV, 4a and 4b) dose for initial simulation plans based on simulation anatomy, non-adaptive plans applied to daily anatomy, and daily adaptive plans. In 4a, esophageal protection occurred concurrently with PTV dose escalation. In 4b, dose de-escalation to the PTV was required to meet hard stomach constraints.
