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Table 1 Dose volume constraints for target volumes as well as organs at risk

From: The effect of extremely narrow MLC leaf width on the plan quality of VMAT for prostate cancer

Structure Initial dose volume constraints Relative priority
Primary plan
Primary PTV D100% ≥ 99.5 % of the prescription dose 150
  D98% ≥ 100 % of the prescription dose 150
  D2% ≤ 101 % of the prescription dose 150
  Dmax ≤ 102 % of the prescription dose 150
Rectal wall V44Gy ≤ 20 % 100
  V30Gy ≤ 50 % 100
Bladder V44Gy ≤ 20 % 100
  V30Gy ≤ 50 % 100
Femoral heads V23Gy ≤ 50 % 80
Boost plan
Boost PTV D100% ≥ 99.5 % of the prescription dose 150
  D98% ≥ 100 % of the prescription dose 150
  D2% ≤ 101 % of the prescription dose 150
  Dmax ≤ 102 % of the prescription dose 150
Rectal wall V22Gy ≤ 20 % 100
  V18Gy ≤ 50 % 100
Bladder V22Gy ≤ 20 % 100
  V18Gy ≤ 50 % 100
Femoral heads V12Gy ≤ 50 % 80
  1. Abbreviations: D n% Dose received by at least n% volume of the target volume, V kGy  the percent volume of a structure irradiated by at least k Gy, PTV planning target volume