常规等中心放射治疗和X刀治疗系统是用激光灯的激光束来进行摆位的,所要参照的激光束是在床的两侧边缘和床面的上方。因此不仅要求三维激光束的交点与等中心点重合,还要求在整个治疗的范围内,3条垂直激光束应形成2个正交平面,并且这2个面的投影与准直器0位时“十”字线的投影相 Routine isocenter radiotherapy and X-knife treatment systems use a laser beam to position the laser beam to be referenced over the sides of the bed and above the bed. Therefore, it is not only required that the intersection point of the three-dimensional laser beam coincides with the isocenter, but also the three perpendicular laser beams should form two orthogonal planes in the whole treatment range and the projection and collimator 0 positions of these two planes “Ten” word line projection phase