IMRT Course 2016

IMRT audit results

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Dose determination audits with anthropomorphic phantoms show , in the

target volume, an agreement between different centres of:

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About 3% (1 standard deviation) for 3D-CRT

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Up to 8% (1 standard deviation) for IMRT

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30% of clinics failed to deliver correct IMRT H&N plans (7%/4mm)

according to Ibbot et al. (IJROBP 2008), due to:

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Incorrect output factors and percent depth dose data

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Inadequate modeling of the penumbra at MLC leaf ends

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Incorrect application of QA calculations or measurements

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Inadequate QA of multileaf collimator

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Incorrect patient positioning

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Errors in treatment planning software

05/04/2016