Fig.6

Coefficients of determination (R²) for regression models between plan parameters listed in the X-axis and geometric parameters of the anatomy. Regression models were described by using the following format: Plan parameter(geometric parameters of the anatomy): correlation type. PTV_LN CI_60Gy (PTV_PT volume, PTV_LN volume, and min distance_{(PT to LN)}): Linear correlation: PTV_(PT+LN) CI_60Gy (PTV_PT volume, PTV_LN volume, min distance_{(PT to LN)}, and overlapping slices thickness_{(PT and LN)}): Linear correlation. Total lung V₂₀ (corrected volume ratio_{(LN to total lung)}): Linear correlation: Physical total lung MLD (corrected volume ratio_{(LN to total lung)}): Linear correlation: EQD₂ total lung MLD (corrected volume ratio_{(LN to total lung)}, volume ratio_{(PT to total lung)}): Linear correlation: Ipsilateral lung V₂₀ and MLD (min distance_{(PT to LN)}, volume ratio_{(PT to ipsilateral lung)}, and corrected volume ratio_{(LN to ipsilateral lung)}): Linear correlation: Heart D₃₀ (volume ratio of overlapping structure_{(heart and LN)} to PTV_LN): S type function. Physical heart D₅ and MHD (volume ratio of overlapping structure_{(heart and LN)} to PTV_LN): S type function. EQD₂ heart D₅ and MHD (volume ratio of overlapping structure_{(heart and LN)} to Heart): S type function. EQD₂ heart D_max (min distance _{(PTVPT to heart)}): Inverse function. Physical esophagus D_max (min distance_{(PTVPT to ESO)}): Inverse function for C&SIB plans. EQD₂ esophagus D_max (min distance_{(PTVPT to ESO)}): Inverse function