The main difference between the two is the imaging equipment used. CR has now been replaced by DR. The protective layer of the high-voltage cable is the outermost layer of the high-voltage cable, which is generally woven with black cotton yarn and vinylon thread, and its function is to strengthen the mechanical strength of the high-voltage cable. In order to ensure the high-voltage insulation of the high-voltage cable and the convenience of loading and unloading, the high-voltage cable is made into a detachable form. Both ends of the high-voltage cable are equipped with high-voltage plugs, and corresponding sockets are installed on the high-voltage transformer and X-ray tube.