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Panel (a) shows the DVHs for the PTV without dose escalation (solid lines) and the PTV and BTVs with dose painting (dashed lines) for a sample patient. Panel (b) shows DVHs for organs at risk for plans without dose escalation (solid lines) and with dose painting (dashed lines) for the same sample patient. BTVs, biological target volumes; DVH, dose–volume histogram; PTV, planning target volume.
