IMRT

Effects of the beam modulating elements that need to be modeled for high-precision dose calculation

• leaf transmission, (jaw transmission)

inter-leaf leakage

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• leaf/jaw tip factors (influence on penumbra shapes)

tongue-and-groove

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systematic leaf offsets

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• correction factors for MLC/jaw backscatter into Monitor chamber

→ most of these effects were discussed in the presentations of Marco Schwarz: “IMRT delivery techniques” “TPS commissioning”

ESTRO IMRT course 2015 Dose Calculation in Static and Rotational IMRT Brussels October 8th, 2015

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