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Table 2 Critical organ constraints

From: A single-institution study of stereotactic body radiotherapy for patients with unresectable visceral pulmonary or hepatic oligometastases

   Constraints
Liver metastases Normal liver V21 < 33%
   V15 < 50%
  stomach V21 < 5 cm3
  Spinal cord maximal dose < 22 Gy
  Kidney V 15 < 33%
Lung metastases normal lung (= volume of right + left lung – PTV) V5 < 50%
   V10 < 30%
  One lung V 20 < 20%
  Heart V24 < 15 cm3
   Dmax < 30 Gy
  trachea and principal bronchi V 15 < 4 cm3
   V 20 < 1 cm3
   Dmax < 30 Gy
  esophagus V 21 < 5 cm3
   Dmax < 25 Gy