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Dose volume histogram (DVH) for femoral heads is shown. The solid lines indicate DVHs of intensity-modulated radiation therapy with 6-MV photon beams while dashed lines and dotted lines indicate DVHs of intensity-modulated radiation therapy with 10-MV and 15-MV, respectively. It indicates that intensity-modulated radiation therapy with 6-MV delivers higher dose to femoral heads than the others.
