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Isodose line comparison of treatment plans for a patient with a right parotid gland tumor. The patient was treated with electron beam therapy (panel a), and post hoc plans were created for intensity-modulated radiotherapy (b), passive scatter proton radiotherapy (c), and intensity-modulated proton radiotherapy (d). The inhomogeneity coefficients for the respective plans were 1.21 (EBT), 1.02 (IMRT), 1.06 (PSPT), and 1.06 (IMPT).
