Table 6. Top eight rankings of the dose index affecting re-planning.

Index	P1	P2	P3	R
PTV Dmean	0.89	0.08	−0.29	0.89
Rectal Dmax	0.88	−0.06	0.11	0.88
PTV Dmax	0.87	0.18	−0.23	0.87
Bladder Dmax	0.85	0.18	−0.20	0.85
Bladder D2cc	0.83	0.12	−0.27	0.83
Rectal D1cc	0.83	−0.07	0.09	0.83
Rectal D2cc	0.82	−0.07	0.14	0.82
Bladder D1cc	0.81	0.16	−0.23	0.81

Rule out other factors, only consider the effect of dose index on re-planning; that is, λ₁=1; λ₂=0; λ₃=0, in which P₁, P₂, and P₃ are the “dose index”, “tumor size index”, and “V30 index”, respectively. PTV, planning target volume.