Patent ID: 8208600

Claim:
An X-ray generating apparatus including an X-ray tube for emitting X-ray, tube voltage control means configured to control a tube voltage, tube current control means configured to control tube current of the X-ray tube, and X-ray control means configured to control high-energy X-ray and low-energy X-ray by the tube voltage control means, wherein the X-ray tube includes plural cathodes each of which has a filament, one anode opposed to the plural cathodes, grid electrodes each of which is individually provided to every cathode to control discharge of an electron beam emitted from the cathode, grid voltage generating means configured to generate a voltage to be applied to each grid electrode, and electron beam emission control means configured to alternately apply the grid voltage generated in the grid voltage generating means to each of the grid electrodes to control the emission of the electron beam, and wherein the tube voltage control means includes first tube voltage control means configured to control a high tube voltage corresponding to the high energy X-ray, and second tube voltage control means configured to control a low tube voltage corresponding to the low energy X-ray, and wherein the tube current control means includes first tube current control means configured to control tube current corresponding to the high energy X-ray, and second tube current control means configured to control tube current corresponding to the low energy X-ray.