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Average DVHs of the OARs comparing VMAT to IMPT plans: (A) brain, (B) bladder, (C) kidneys, (D) lungs, (E) esophagus, (F) eyes, (G) parotids, (H) stomach, (I) heart, (J) intestine, (K) thyroid, and (L) liver. DVHs, dose–volume histograms; OARs, organs at risk; VMAT, volumetric modulated arc therapy; IMPT, intensity-modulated spot-scanning proton therapy.
