[Choice of the optimum intersection point for beam radiation axis in the planning of radiotherapy]

A method has been developed to search for the optimum radiation regimen including the optimum radiation directions, the optimum duration of exposure, and the optimum point (center) of intersection of the central axes of radiation bundles. To solve the goal of determining the optimum radiation regimen for central lung cancer has indicated that variations in the intersection center of radiation bundles improves the radiation regimen. The optimum position of the intersection center of radiation bundles may greatly differ from the routine choice of the center. To standardize the optimum radiations in central lung cancer, it is necessary to solve special extreme tasks that minimize the numbers of the optimum radiation directions, which thus allows the main (structural) radiation directions to be identified.