Abstract
The goal of standard 3DCRT treatment planning for extracranial stereotactic radioablation (ESR) is to maximize planning target volume (PTV) dose conformity and limit both high and intermediate isodose volumes outside of the PTV. Most targets are concave in nature and are isolated within organs with parallel architecture making full-fledged IMRT treatment unnecessary. We have previously shown that proper selection of beam shape and block (MLC) margin on the PTV for 3DCRT has a very significant effect on normal tissue sparing for ESR (IJROBP 1999;45:515–520).
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