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Table 1 Dose-volume constraints to organs at risk

From: Stereotactic body radiotherapy based treatment for hepatocellular carcinoma with extensive portal vein tumor thrombosis

Organs at risk

Constraints (5 Fractions)

Liver

mean dose ≤15 Gy, >700 cc

Kidney

mean dose ≤12 Gy

V18 < 33%

Spinal cord

maximal dose < 27 Gy

Stomach

V31 < 1 cc

V20 < 3 cc

Duodenum

V31 < 1 cc

V20 < 3 cc

Small intestine

V31 < 1 cc

V20 < 3 cc

Colon

V31 < 1 cc

V20 < 10 cc

  1. Abbreviations: Vxx = the volume or percentage of organ receiving more than the xx Gy