抄録
A linear accelerator applied to conformation radiotherapy was described. The mechanism and dose distribution in the linear accelerator conformation radiotherapy were discussed, together with a comparison with those in telecobalt therapy. In this machine a collimator was divided into six leaves, which were driven independently by a servo system following signals given by the signal generator. The mechanical error in this system was within a range of +1.47 to-1.80%. The size and shape of radiation-dense area, ‘beam focus’, made by this unit sufficiently coincided geometrically with the region of planned treat-ments. The homogeneity of dose distribution was better than that by telecobalt gamma-rays.
