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目前医用直线加速器生产厂家提供的设备,除个别型号外大多只有定角照射(SSD)、等中心照射(ISO)及弧形旋转治疗(ARC)三种方式。1987年根据临床需要,我们在Philips SL75-20机上对控制电路做了改动
At present, most of the equipment provided by the medical linear accelerator manufacturers are only fixed angle irradiation (SSD), isocentric irradiation (ISO) and arc rotation therapy (ARC) except for a few models. In 1987, we made changes to the control circuit on the Philips SL75-20, depending on the clinical needs