Patent Number: 
Section: claims

1. An X-ray grid structure configured to be coupled with an X-ray detector, the X-ray grid structure comprising:an X-ray grid configured to selectively transmit X-rays to the X-ray detector; anda plurality of holders, discrete from the X-ray grid, fixed along an outer edge of the X-ray grid,wherein the X-ray grid comprises:a first surface configured to receive the X-rays; anda second surface opposite to the first surface of the X-ray grid, wherein the X-rays are transmitted from the first surface of the X-ray grid through the second surface of the X-ray grid toward a first surface of the X-ray detector,wherein at least one of the plurality of holders comprises:a fixing portion fixed to the first surface of the X-ray grid; anda support portion configured to be detachably coupled to the X-ray detector and configured to support a second surface of the X-ray detector, the second surface of the X-ray detector being opposite to the first surface of the X-ray detector, andwherein the support portion of the at least one of the plurality of holders comprises an elastic material and is configured to be elastically bendable to allow the X-ray grid structure to be detachably coupled to the X-ray detector. 2. The X-ray grid structure of claim 1, wherein the plurality of holders are spaced apart from each other along the outer edge of the X-ray grid. 3. The X-ray grid structure of claim 1, wherein the elastic material comprises at least one of polyurethane and silicone. 4. The X-ray grid structure of claim 1, wherein the X-ray grid has a rectangular shape, and the plurality of holders are disposed at corners of the X-ray grid. 5. The X-ray grid structure of claim 1, wherein the support portion of the at least one of the plurality of holders is configured to be elastically bendable in a direction different from a surface direction of the X-ray grid. 6. An X-ray grid structure configured to be coupled with an X-ray detector, the X-ray grid structure comprising:an X-ray grid configured to selectively transmit X-rays to the X-ray detector; anda plurality of holders fixed along an outer edge of the X-ray grid,wherein at least one of the plurality of holders comprises an elastic material and is configured to be elastically deformable to allow the X-ray grid structure to be detachably coupled to the X-ray detector,wherein the at least one of the plurality of holders comprises:a fixing portion fixed to the X-ray grid; anda support portion configured to be detachably coupled to the X-ray detector and configured to support the X-ray detector, andwherein the support portion comprises:a rear support portion configured to support a rear side of the X-ray detector which is opposite to a front side of the X-ray detector facing the X-ray grid; anda side support portion configured to support a lateral side of the X-ray detector between the front side and the rear side. 7. The X-ray grid structure of claim 6, wherein the fixing portion comprises a slope, so that a height of the fixing portion increases in an outward direction from a center portion of the X-ray grid. 8. The X-ray grid structure of claim 6, wherein the rear support portion comprises a slope, so that a height of the rear support portion increases in an outward direction from a center of the X-ray grid. 9. The X-ray grid structure of claim 6, wherein the elastic material comprises polyurethane. 10. The X-ray grid structure of claim 6, wherein the at least one of the plurality of holders is configured to be elastically deformable in a direction different from a surface direction of the X-ray grid. 11. An X-ray grid structure configured to be coupled with an X-ray detector, the X-ray grid structure comprising:an X-ray grid configured to selectively transmit X-rays to the X-ray detector; anda plurality of holders fixed along an outer edge of the X-ray grid,wherein at least one of the plurality of holders comprises an elastic material and is configured to be elastically deformable to allow the X-ray grid structure to be detachably coupled to the X-ray detector,wherein the at least one of the plurality of holders comprises:a fixing portion fixed to the X-ray grid; anda support portion configured to be detachably coupled to the X-ray detector and configured to support the X-ray detector, andwherein the fixing portion is fixed to the X-ray grid using an adhesive. 12. The X-ray grid structure of claim 11, wherein the support portion comprises:a rear support portion configured to support a rear side of the X-ray detector which is opposite to a front side of the X-ray detector facing the X-ray grid; anda side support portion configured to support a lateral side of the X-ray detector between the front side and the rear side. 13. An X-ray grid structure configured to be coupled with an X-ray detector, the X-ray grid structure comprising:an X-ray grid configured to selectively transmit X-rays; anda plurality of holders fixed along an outer edge of the X-ray grid,wherein at least one of the plurality of holders comprises an elastic material and is configured to be elastically deformable to allow the X-ray grid structure to be detachably coupled to the X-ray detector,wherein the X-ray grid comprises:a front side facing the X-ray detector and a rear side opposite to the front side; andreinforcement films disposed on at least one side of the front side and the rear side of the X-ray grid to reinforce the X-ray grid. 14. An X-ray grid structure comprising:an X-ray grid configured to selectively transmit X-rays to an X-ray detector; anda plurality of holders fixed along an outer edge of the X-ray grid,wherein at least one of the plurality of holders comprises an elastic material and is configured to be elastically deformable to allow the X-ray grid structure to be detachably coupled to the X-ray detector,wherein the X-ray grid comprises a front side facing the X-ray detector and a rear side opposite to the front side, andthe at least one of the plurality of holders comprises:a first member contacting the rear side of the X-ray grid;a second member contacting the front side of the X-ray grid; anda coupling member fastening the first member and the second member together. 15. The X-ray grid structure of claim 14, wherein the first member comprises at least one coupling hole structure protruding toward the second member for coupling with the coupling member, andthe second member comprises a connection hole receiving the coupling member and connected to the at least one coupling hole structure. 16. The X-ray grid structure of claim 15, wherein the coupling member comprises a body portion coupled to the at least one coupling hole structure and a head portion for pressing the second member, and,the body portion comprises a threaded region screwed into the at least one coupling hole structure and a non-threaded region on which a thread is not formed. 17. The X-ray grid structure of claim 14, wherein the second member comprises an elastic material. 18. The X-ray grid structure of claim 17, wherein the first member comprises a material different from a material included in the second member. 19. The X-ray grid structure of claim 18, wherein the first member has a bending strength greater than that of the second member. 20. An X-ray apparatus comprising:an X-ray radiation unit configured to emit X-rays;an X-ray detector configured to detect the X-rays having passed through an object; andan X-ray grid structure which is configured to be coupled with the X-ray detector, and comprises:an X-ray grid configured to selectively transmit X-rays to the X-ray detector; anda plurality of holders, discrete from the X-ray grid, fixed along an outer edge of the X-ray grid,wherein at least one of the plurality of holders comprises an elastic material and is configured to be elastically deformable to allow the X-ray grid structure to be detachably coupled to the X-ray detector,wherein the at least one of the plurality of holders comprises:a fixing portion fixed to the X-ray grid; anda support portion configured to be detachably coupled to the X-ray detector and configured to support the X-ray detector, andwherein the support portion comprises:a rear support portion configured to support a rear side of the X-ray detector which is opposite to a front side of the X-ray detector facing the X-ray grid; anda side support portion configured to support a lateral side of the X-ray detector between the front side and the rear side. 21. An X-ray apparatus of claim 20, wherein the at least one of the plurality of holders is configured to be elastically deformable in a direction different from a surface direction of the X-ray grid. 22. An X-ray apparatus comprising:an X-ray detector configured to receive X-rays; andan X-ray grid structure which is configured to filter X-rays, and comprises:an X-ray grid configured to filter the X-rays; anda first holder, discrete from the X-ray grid, configured to detachably attach the X-ray grid to the X-ray detector,wherein the X-ray grid comprises:a first surface configured to receive the X-rays; anda second surface opposite to the first surface of the X-ray grid, the second surface being configured to transmit the X-rays received from the first surface of the X-ray grid toward a first surface of the X-ray detector,wherein the first holder comprises:a fixing portion fixed to the first surface of the X-ray grid; anda support portion configured to be detachably attached to the X-ray detector and configured to support a second surface of the X-ray detector, the second surface of the X-ray detector being opposite to the first surface of the X-ray detector,wherein the support portion of the first holder is made of an elastic material and is configured to be elastically deformable to allow the X-ray grid structure to be detachably attached to the X-ray detector, andwherein the fixing portion and the support portion of the first holder form a C-shape clip in a cross-section. 23. The X-ray apparatus of claim 22, further comprising:a second holder, a third holder, and a fourth holder, wherein the first holder, the second holder, the third holder, and the fourth holder are each configured to be detachably attached at a corner portion of the X-ray detector and the X-ray grid. 24. The X-ray apparatus of claim 22, wherein the X-ray grid structure is attached to the X-ray detector such that the X-ray grid is disposed between the X-ray detector and an X-ray emitter. 25. An X-ray apparatus of claim 22, wherein the support portion of the at least one of the plurality of holders is configured to be elastically bendable in a direction different from a surface direction of the X-ray grid.