Fig. 6
From: A Nomogram to predict parotid gland overdose in head and neck IMRT
Benefit of weekly replanning for the 14 parotid gland (PG) overdose patients identified by the nomogram. Cumulated mean dose difference between doses with replanning and those without (left y-axis), in each of the parotid glands (PGs) (ipsilateral and contralateral). The corresponding estimated risk of xerostomia (%), computed using the normal tissue complication (NTCP) Lyman Kutcher Burman (LKB) model (LKB NTCP) (n = 1, m = 0.4, and median toxic dose [TD50] = 39.9) [23, 24] is represented on the right y-axis. Xerostomia was defined as a salivary flow ratio <25 % of the pretreatment one