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Table 3 Results of the comparison of the dose obtained from the plan reconstructed from the expected positions with the dose obtained from a plan reconstructed from modified actual positions in which position errors were scaled up to a maximum of 10 and 30 mm

From: Treatment verification using Varian’s dynalog files in the Monte Carlo system PRIMO

Region Σ=10 mm   Σ=30 mm
  PA [%] GPR 2,2 [%] GPR 3,3 [%]   PA [%] GPR 2,2 [%] GPR 3,3 [%]
Prostate
PTV 1 99.6 100 100   98.3 90.7 99.9
PTV 2 99.5 100 100   98.1 92.2 99.9
PTV 3 99.6 100 100   98.4 97.7 100
PTV 4 99.5 100 100   98.2 94.5 99.5
PTV total 99.5 100 100   98.3 94.9 99.7
Rectum 99.8 100 100   99.2 100 100
Bladder 99.0 100 100   97.2 99.3 99.9
Body 99.5 100 100   98.6 99.8 100
H&N
PTV 1 99.7 100 100   98.6 93.3 100
PTV 2 99.7 100 100   98.9 98.2 100
Spinal canal 99.6 100 100   99.0 100 100
Parotid left 99.8 100 100   99.5 100 100
Parotid right 99.3 100 100   98.1 100 100
Body 99.7 100 100   99.2 99.9 100
  1. A good agreement of both dose distributions is obtained for Σ=10 mm. The effect on the dose of induced errors is noticeable for Σ=30 mm