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Published online by Cambridge University Press: 21 August 2006
In this article several issues will be discussed. Firstly, the efficacy of using helical CT data to image the thorax, and delineate volumes (clinical target volumes (CTV) and planning target volumes (PTV). Secondly, the practicalities of using CT data sets for dose inhomogeneity corrections and planning in the thorax. And thirdly, the associated problems of organ motion and immobilisation in this region.