Patent Number: 
Section: claims

1. An X-ray imaging system comprising:an X-ray generating apparatus to generate and emit X-rays;a detector to detect the X-rays emitted from the X-ray generating apparatus; andat least one collimator disposed in a path between the X-ray generating apparatus and the detector to prevent dispersion of the X-rays emitted from the X-ray generating apparatus,wherein the collimator comprises a plurality of capillary tubes each having a longitudinal axis disposed in parallel to each other and an advancing direction of the x-rays, andeach of the capillary tubes has at least one diffraction layer to diffract X-rays passing therethrough. 2. The X-ray imaging system according to claim 1, wherein the diffraction layer comprises at least one selected from the group of tungsten (W), molybdenum (Mo), lead (Pb) and platinum (Pt). 3. The X-ray imaging system according to claim 2, whereineach of the capillary tubes comprises at least one transmission layer to transmit the X-rays diffracted by the diffraction layer, andthe diffraction layer and the transmission layer being alternately disposed from an outside of each of the capillary tubes toward a center of each of the capillary tubes, to form a layered structure thereby. 4. The X-ray imaging system according to claim 3, wherein the transmission layer comprises at least one selected from the group carbon (C), silicon (Si), aluminum (Al), polymer, nitride and oxide. 5. The X-ray imaging system according to claim 1, wherein the collimator comprises a plurality of crystal lattices to filter X-rays having a specific wavelength. 6. The X-ray imaging system according to claim 1, wherein the X-ray generating apparatus comprises:a cathode unit having a plurality of emitters to emit electrons and gates to form an electric field between the gates and the emitters so that electrons are emitted from the emitters; andan anode unit having a target with which the electrons emitted from the cathode unit collide to generate X-rays. 7. The X-ray imaging system according to claim 6, wherein the cathode unit is formed in a flat shape, and the emitters are disposed at a surface of the flat cathode unit in a matrix. 8. The X-ray imaging system according to claim 7, wherein the target is formed in a rugged shape to prevent dispersion of X-rays. 9. The X-ray imaging system according to claim 8, wherein the target has at least one diffraction layer to diffract X-rays. 10. The X-ray imaging system according to claim 9, wherein the diffraction layer comprises at least one selected from among tungsten (W), molybdenum (Mo), lead (Pb) and platinum (Pt). 11. The X-ray imaging system according to claim 1, wherein the collimator is disposed in parallel to the X-ray generating apparatus, and the collimator or the X-ray generating apparatus is disposed so as to be movable in a manner parallel to each other. 12. An X-ray imaging system comprising:an X-ray generating apparatus to generate and emit X-rays;a detector to detect the X-rays emitted from the X-ray generating apparatus; andat least one collimator disposed in a path between the X-ray generating apparatus and the detector to prevent dispersion of the X-rays emitted from the X-ray generating apparatus,wherein the collimator comprises a plurality of capillary tubes disposed in parallel to each other, andeach of the capillary tubes has at least one diffraction layer to diffract X-rays passing therethrough,wherein the X-ray generating apparatus comprises:a cathode unit having a plurality of emitters to emit electrons and gates to form an electric field between the gates and the emitters so that electrons are emitted from the emitters; andan anode unit having a target with which the electrons emitted from the cathode unit collide to generate X-rays;wherein the target is formed in a rugged shape to prevent dispersion of X-rays;wherein the target has at least one diffraction layer to diffract X-rays;wherein the target comprises at least one transmission layer to transmit the X-rays diffracted by the diffraction layer, andthe diffraction layer and the transmission layer are alternately disposed to form a rugged layered structure. 13. The X-ray imaging system according to claim 12, wherein the transmission layer comprises at least one selected from among carbon (C), silicon (Si), aluminum (Al), polymer, nitride and oxide. 14. The X-ray imaging system according to claim 13, wherein the emitters are individually controllable. 15. An X-ray imaging system comprising:an X-ray generating apparatus to generate X-rays;a detector to detect the X-rays emitted from the X-ray generating apparatus and transmitted through a subject to be tested; andat least one collimator to collimate the X-rays emitted from the X-ray generating apparatus, whereinthe collimator is disposed between the X-ray generating apparatus and the subject or between the subject and the detector,wherein the collimator comprises a plurality of capillary tubes each having a longitudinal axis disposed in parallel to each other and an advancing direction of the x-rays, andeach of the capillary tubes has at least one diffraction layer to diffract X-rays passing therethrough. 16. The X-ray imaging system according to claim 15, whereineach of the capillary tubes comprises:at least one diffraction layer to diffract X-rays passing therethrough; andat least one transmission layer to transmit the X-rays diffracted by the diffraction layer,the diffraction layer and the transmission layer being alternately disposed from an outside of each of the capillary tubes toward a center of each of the capillary tubes to form a layered structure. 17. The X-ray imaging system according to claim 16, wherein the capillary tubes include a plurality of diffraction layers, and distances between the diffraction layers are equal to each other. 18. The X-ray imaging system according to claim 15, wherein the collimator comprises a plurality of crystal lattices to filter X-rays which have a specific wavelength. 19. The X-ray imaging system according to claim 15, wherein the collimator is disposed in parallel to the X-ray generating apparatus, and the collimator or the X-ray generating apparatus is disposed so as to be movable in a direction parallel to each other. 20. The X-ray imaging system according to claim 15, wherein the X-ray generating apparatus comprises:a cathode unit having a plurality of emitters to emit electrons and gates to form an electric field between the gates and the emitters so that electrons are emitted from the emitters; andan anode unit having a target with which the electrons emitted from the cathode unit collide to generate X-rays. 21. The X-ray imaging system according to claim 20, wherein the target comprises a plurality of layers made of different materials. 22. The X-ray imaging system according to claim 21, whereinthe layers comprise at least one diffraction layer to diffract X-rays and at least one transmission layer to transmit X-rays, andthe diffraction layer and the transmission layer are alternately disposed to form a rugged layered structure.