Table 2.

The initial dose‐volume constraints for boost plan.

Structure	Initial Dose‐volume Constraints	Relative Priority
${\text{PTV}}_{\mathrm{B}}$ a	${\mathrm{D}}_{100\%}$ b $\ge 102\%$ of the prescription dose	150
	$D_{98\%}\ge 102.2\%$ of the prescription dose	150
	${\mathrm{D}}_{2\%}\le 102.8\%$ of the prescription dose	150
	${\mathrm{D}}_{max}$ c $\le 103\%$ of the prescription dose	150
Rectum Wall	${\mathrm{V}}_{30\text{Gy}}$ d $\le 0\%$	100
	${\mathrm{V}}_{26\text{Gy}}\hspace{0.17em}\le 20\%$	100
	${\mathrm{V}}_{19\text{Gy}}\hspace{0.17em}\le 50\%$	100
Bladder	${\mathrm{V}}_{30\text{Gy}}\hspace{0.17em}\le 0\%$	100
	${\mathrm{V}}_{26\text{Gy}}\hspace{0.17em}\le 30\%$	100
	${\mathrm{V}}_{19\text{Gy}}\hspace{0.17em}\le 55\%$	100
Femoral Heads	${\mathrm{V}}_{16\text{Gy}}\hspace{0.17em}\le 0\%$	80
	${\mathrm{V}}_{15\text{Gy}}\hspace{0.17em}\le 20\%$	80
	${\mathrm{V}}_{12\text{Gy}}\hspace{0.17em}\le 50\%$	80
Body	${\mathrm{D}}_{max}\le 31.5\text{Gy}$	180

^a ${\text{PTV}}_{\mathrm{B}}$ is boost planning target volume.

^b ${\mathrm{D}}_{\mathrm{n}\%}$ means the dose received by the n% volume of the target volume.

^c ${\mathrm{D}}_{max}$ means the maximum dose received.

^d ${\mathrm{V}}_{\text{nGy}}$ means the percentage volume irradiated by n Gy or more of a certain structure.