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Table 1 The contoured organs at risk (OARs), dose constraints/penalty functions and planning parameters of plan was listed as below

From: Toxicity risk of non-target organs at risk receiving low-dose radiation: case report

Tumor Importance Max Dose Constraint [Gy] Max Dose Penalty DVH vol [%] DVH dose [Gy] DVH dose [Gy] Min Dose Penalty
PTV_T8-T10_30Gy 50 30.00 800 95 30.00 30.00 100
Sensitive Structure Importance Max Dose Constraint [Gy] Max Dose Penalty DVH vol [%] DVH dose [Gy] DVH Point Penalty  
Right lung 10 30.00 5 2 10.00 20  
Left lung 10 30.00 5 1 15.00 20  
Spinal cord 40 20.00 40 45 5.00 40  
Heart 10 26.00 10 20 5.00 15  
Spleen 5 7.00 5 10 2.00 5  
Stomach 1 13.00 5 10 2.00 5  
Ring* 1 30.00 50 3 28.00 20  
  1. Abbriviations:
  2. PTV = Planning target volume; Max = maximal; Min = minimal; DVH = dose-volume histogram; Vol = volume.
  3. *The ring was a dummy structure surrounded PTV with an outer margin 2.5 cm, and a gap of 2 mm from PTV.