Figure 2. Box plots comparing key dose-volume histogram (DVH) parameters of organs-at-risk (OARs) for two delivery systems and intensity-modulated radiation therapy (IMRT) or volumetrically modulated arc therapy (VMAT) techniques. Red represents Truebeam® plans using TB multi-leaf collimator (MLC), and blue represents Halcyon™ plans using the Halcyon™ dual-layer MLC.