IMRT

Dose calculation issues ‚in practice‘: Dose calculation for lung lesions

A fundamental problem of the PTV-concept:

In the ICRU concept the PTV is a virtual, non-anatomical planning volume  generally extends into low density region: lung tissue/air  What density should be used for planning, so that reported PTV dose is well representative for the dose-to-moving- tumour?

???

as-is (no density override)

average density CT based on RCCT

virtual density overwrite

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

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