Table 2 List of parameters collected for internal and planning target volume

TPS

Equivalent sphere diameter, volume, planned dose (min, mean, max)

Equivalent sphere diameter, volume, planned dose (min, mean, max), D_2%, D_95%, D_98%, V_100%, V_50%, lung lobe where the PTV is located

Deformable image registration

Delivered dose (min, mean, max), subtracted (delivered-planned) dose (min, mean, max)

Dice similarity coefficient (DSC = 2 × |PCT∩ACT| / (|PCT|+|ACT|), also called as conformality), surface distance (mean, standard deviation, max), Warp (min, mean, max), log Jacobian (min, Q1, median, Q3, max, MMR, IQR, delivered dose (min, mean, max, D_2%, D_95%, D_98%), subtracted (delivered-planned) dose (min, mean, max)

Dose evaluation index

Homogeneity index (HI = (D_2% - D_98%)*100/ D_prescribed [40]) and ΔHI = HI_delivered-HI_planned, conformity index (CI = V_100%/volume), gradient index (GI = V_100%/V_50%), gradient measure (GM = (3×V_50%/4π)^1/3-(3×V_100%/4π)^1/3