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Receiver operating characteristics curves (ROC) for V20Gy and V40Gy for (a) proton patients and (b) photon patients. V35Gy to V50Gy resulted in the highest area under the curve values of ≥0.80 compared with the other dose levels for proton patients. V20Gy resulted in the highest area under the curve value of 0.707 compared with the other dose levels for photon patients.
