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Table 1 Dosimetric objectives used for IMRT and VMAT plans optimization for PTV and healthy structures

From: Estimating cancer risks due to whole lungs low dose radiotherapy with different techniques for treating COVID-19 pneumonia

Organ Objective IMRT/VMAT
PTV (lungs + 5 mm margins) V105% < 5%
V100% ≥ 95%
V95% ≥ 99%
Heart V90% < 30%
V60% < 40%
V20% < 90%
Breast V80% < 5%
V30% < 20%
Esophagus V90% < 10%
V50% < 50%
Spinal cord Max dose < 95% of prescribed dose
Body V105%  < 3 cc
  1. Vx%: The percentage volume of the organ received at least x% of the prescribed dose