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Tetrahedral irradiation protocol for microbeam radiation therapy

Optimizing microbeam radiation therapy requires that the patient be repositioned between exposures. Optional movements of a patient-gantry are described that would enable a lesion to be cross-fired pseudo-orthogonally in two, three or four exposures to a fixed, horizontally propagated array of vertical, parallel microplanar beams, with minimal tilting of the patient-gantry.