Fig. 5
From: A Nomogram to predict parotid gland overdose in head and neck IMRT
Correlation between observed and predicted parotid gland (PG) doses. Representation of the observed (vertical axis) and predicted (horizontal axis) values of PG dose variation (difference between cumulated and planned PG dose) for each PG. The model included three parameters (CTV70 shrinkage at the CT1, mean PG dose difference between the dose delivered at CT1 and the planned dose, and CTV70 at the planning). Blue line: regression line (R2 = 0.75). Red areas: wrong predictions (e.g. predicted overdose vs. observed under-dose). CT: computed tomography; CTV70 (in cm3): clinical target volume receiving 70Gy; CT1: Week 1 treatment CT