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Table 3 Correlation between the anatomical/dosimetric parameters (calculated on CT0 and CT1) and the PG overdose

From: A Nomogram to predict parotid gland overdose in head and neck IMRT

Analyzed parameters r2 p-value
CTV70_CT0 0.32 0.038
∆CTV70 −0.46 0.004
∆DosePG 0.72 <0.001
DmeanPG_CT1 0.49 0.002
DmeanPG_CT1/DmeanPG_CT0 0.70 <0.001
  1. r2 = Pearson correlation value, DmeanPG = Mean PG dose (Gy), _CT0 = on the planning CT (CT0), _CT1 = CT at the first week (CT1), ∆ = difference of the parameter between CT1 and CT0