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Evaluation of conformality of prescribed dose per RTOG protocol guidelines: (a) PITV- ratio; (b) R50% ratio; (c) D2 cm (Gy); and (d) lung V20 (%). Dashed lines represent RTOG protocol limits for no violation and minor violation in the plan quality metric. PITV, prescription isodose to target volume; RTOG, radiation therapy oncology group.
