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Ｘ－刀治疗是一种不开刀的颅脑手术，它是以产生硬Ｘ线的医用直线加速器为放射源，将定位。定向和加速器等多系统置于同一中心为工作基点所实施的立体定向放射外科治疗。其宗旨是利用立体定向技术将大剂量高能物理射线高精度、一次或几次限制性照射到所设定的颅内某一靶点上，
X-knife treatment is a kind of non-surgical brain surgery, which is based on the production of hard X-ray linear accelerator for the radioactive source, will be positioned. Directional and accelerator and other systems placed in the same center for the implementation of the base point of the three-dimensional directional radiosurgery. Its purpose is to use stereotactic technology to high-dose high-energy physical radiation high-precision, one or several times limited exposure to a set of intracranial target,