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Specificity and sensitivity versus volume percentage for V35Gy, V40Gy, and V50Gy for (a) proton therapy patients and V20Gy for (b) photon therapy patients. The point of intersection between the solid and dashed line indicate at what volume percentage receiving 20 Gy, 35Gy, 40 Gy, and 50 Gy bests predicts radiation pneumonitis.
