A COMPARISON OF ARC-BASED AND STATIC MINI-MULTILEAF COLLIMATOR-BASED RADIOSURGERY TREATMENT PLANS

Background: The purpose of this study is to compare are-based and mini -multileaf collimator (mMLC)-based radiosurgery treatment plans using isodose distributions and dose-volume histograms. Methods: Of 11 patie nts who underwent conventional are-based radiosurgery for intracranial malignancies, four were treated with one isocenter, four were treated with two isocenters and three were treated with three isocenters. The same cases were re-planned using a test version of mMLC-based radiosu rgery software for multiple static non-coplanar fields. Results and co nclusion: For non-spherical targets, treatment planning is relatively intuitive with mMLC-based radiosurgery, reducing the amount of time re quired for planning. Moreover, a lower dose of radiation is delivered to normal tissue with mMLC-based radiosurgery than with are-based radi osurgery, which theoretically should lead to a reduced risk of complic ations. (C) 1997 Elsevier Science Ireland Ltd.