Importance

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Abstract

For quality assurance of radiation beams from a radiation source used for therapy of a patient, a reference structure is attached to the patient on the radiation therapy machine in a known position relative to the patient and the radiation machine. Predicted projection contours of the radiation beams onto the reference structure are determined and described on the reference structure. Field lights in the radiation machine through the collimator aperture of the beams are cast upon the reference structure and the associated light contours of the beam apertures are compared to the described or predicted contours from treatment planning or from quality assurance set up. Several forms of such beam quality control system and methods accommodate the specific objectives. Computer-generated beams projection sheets are overlaid on the reference structure corresponding to predicted field light projections.

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First Claim