Fig. 2

Radar plots showing the difference in OAR dose compared to tolerance for HN 1–4 for VMAT (solid lines) and DTRT (dashed lines). Mean doses are considered for the salivary glands, pharynx, oral cavity and larynx (top) and near max doses are considered for the nervous system (bottom). Negative values indicate better sparing than tolerance. Positive values (grey shaded area) indicate doses above tolerance. Ipsi: ipsilateral, Contr. contralateral, Submand: Submandibular (gland), excl: excluding