[The safety interlock designed for JX-100 X-knife system]

This paper describes the design of a safety interlock used by X-knife system for preventing the linear accelerator gantry colliding with the treatment couch and the patient when the accelerator is rotating and irradiating X-rays. How to install and adjust the unit is also addressed in this paper. The unit has been successfully used in JX-100 X-knife system developed by the First Military Medical University.