Table 2 OARs constraints and target goals in SBRT for liver metastasis receiving 50 gy in 5 fractions

^aPTV

Stomach

^b\(\:{\text{V}}_{100\%\left(50\text{G}\text{y}\right)\:}\)

≥ 95%

\({}^{\rm{c}}{{\rm{D}}_{{\rm{max}}\>\left( {0.5{\rm{cc}}} \right)}}\)

< 32 Gy

^b\(\:{\text{V}}_{95\%\:\left(47.5\text{G}\text{y}\right)}\)

≥ 99%

c\(\:{\text{D}}_{10\text{c}\text{c}\:}\)

< 18 Gy

^c\(\:{\text{D}}_{\text{m}\text{a}\text{x}\:\left(0.5\text{c}\text{c}\right)}\)

(110%∼140%)D_pre; (55 Gy ∼ 70 Gy)

Rib

^d\(\:{\text{D}}_{\text{m}\text{i}\text{n}\:}\)

≥ 90%\(\:{\text{D}}_{\text{p}\text{r}\text{e}\:}\)(45 Gy)

^c\(\:{\text{D}}_{\text{m}\text{a}\text{x}\:}\)

< 43 Gy

Liver minus GTV

^c\(\:{\text{D}}_{1\text{c}\text{c}\:}\)

< 35 Gy

^e\(\:{\text{D}}_{700\text{c}\text{c}\:}\)

^<18 Gy

Kidney

^f\(\:{\text{D}}_{30\%\:}\)

< 18 Gy

^g\(\:{\text{V}}_{10\text{G}\text{y}\:}\)

< 10%

Spinal cord

^h\(\:{\text{D}}_{\text{m}\text{e}\text{a}\text{n}\:}\)

< 10 Gy

^c\(\:{\text{D}}_{\text{m}\text{a}\text{x}\:}\)

< 30 Gy

Small bowel

^e\(\:{\text{D}}_{0.35\text{c}\text{c}}\)

< 23 Gy

\({}^{\rm{c}}{{\rm{D}}_{{\rm{max}}\>\left( {0.5{\rm{cc}}} \right)}}\)

< 30 Gy

^e\(\:{\text{D}}_{1.2\text{c}\text{c}\:}\)

< 14 Gy

^e\(\:{\text{D}}_{15\text{c}\text{c}\:}\)

< 19.5 Gy

Heart

Duodenum

^c\(\:{\text{D}}_{0.5\text{c}\text{c}}\)

< 27 Gy

^c\(\:{\text{D}}_{5\text{c}\text{c}\:}\)

< 18 Gy

Lung right and left

^c\(\:{\text{D}}_{10\text{c}\text{c}}\)

< 12 Gy

^e\(\:{\text{D}}_{1000\text{c}\text{c}}\)

< 13.5 Gy

Esophagus

^e\(\:{\text{D}}_{1500\text{c}\text{c}}\)

< 12.5 Gy

^c\(\:{\text{D}}_{5\text{c}\text{c}\:}\)

< 19.5 Gy