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  • This invention is a method and system for inverse planning of radiosurgery of tumors. Isocenter points are replaced systematically throughout a model of a tumor to generate a sequence of simulated radiation beams. The crossing geometry and intersection pattern of these beams is then computed. Through fine tuning of certain variables used in the calculations of the present invention, radiosurgery is planned in a manner which avoids over irradiation of healthy tissue, while allowing for homogeneity of the radiation dose inside the tumor. The method of this invention allows for exact decisions about the feasibility of use-defined dose distributions.