Patent Number: 
Section: claims

1. A method for assembling a secondary collimator including a first face plate having a first surface and an opposing second surface, said method comprising:positioning a lamella assembly on the first face plate, wherein the lamella assembly includes at least one radiation-absorbing material layer and at least one radiation-transmitting material layer such that a first surface of the lamella assembly is adjacent the second surface of the first face plate; andcoupling a second face plate to the first face plate and the lamella assembly such that a first surface of the second face plate is adjacent a second surface of the lamella assembly. 2. A method in accordance with claim 1, further comprising fabricating at least the second surface of the first face plate within about 10 μm of a predetermined profile. 3. A method in accordance with claim 1, wherein positioning a lamella assembly on the first face plate further comprises positioning the lamella assembly on a substantially planar first face plate. 4. A method in accordance with claim 1, wherein positioning a lamella assembly on the first face plate further comprises positioning the lamella assembly on a first face plate having an at least partially non-planar profile. 5. A method in accordance with claim 1, wherein positioning a lamella assembly on the first face plate further comprises positioning the lamella assembly on the first face plate such that the first surface and the second surface of the lamella assembly are substantially parallel to the second surface of the first face plate. 6. A method in accordance with claim 1, wherein positioning a lamella assembly on the first face plate further comprises positioning a first lamella on the second surface of the first face plate and positioning a second lamella on the first lamella, wherein each lamella includes at least one radiation-absorbing material layer and at least one radiation-transmitting material layer. 7. A method in accordance with claim 1, wherein coupling a second face plate to the first face plate and the lamella assembly further comprises coupling the second face plate to the first face plate and the lamella assembly using a mechanical fastening mechanism. 8. A secondary collimator, comprising:a first face plate;a second face plate; anda lamella assembly coupled between said first face plate and said second face plate, said lamella assembly comprising at least one lamella, each said lamella comprising at least one radiation-absorbing material layer and at least one radiation-transmitting material layer. 9. A secondary collimator in accordance with claim 8, wherein said lamella assembly comprises a plurality of lamellae, wherein said at least one radiation-absorbing material layer comprises a porous material and said at least one radiation-transmitting material layer comprises a metal layer. 10. A secondary collimator in accordance with claim 8, wherein said first face plate comprises a first surface and a second surface and said lamella assembly comprises a first surface and a second surface, said first surface of said lamella assembly substantially parallel to at least said second surface of said first face plate. 11. A secondary collimator in accordance with claim 8, wherein said first face plate is substantially planar. 12. A secondary collimator in accordance with claim 8, wherein said first face plate is at least partially non-planar. 13. A secondary collimator in accordance with claim 8, wherein said lamella assembly further comprises a plurality of substantially parallel aluminum composite panels. 14. An X-ray diffraction imaging (XDI) system, comprising:an X-ray source;a detector array comprising a plurality of detector elements; anda secondary collimator coupled between said X-ray source and said detector array, said secondary collimator comprising:a first face plate;a second face plate; anda lamella assembly coupled between said first face plate and said second face plate, said lamella assembly comprising at least one lamella, each said lamella comprising at least one radiation-absorbing material layer and at least one radiation-transmitting material layer. 15. An XDI system in accordance with claim 14, further comprising an examination area defined between said X-ray source and said secondary collimator. 16. An XDI system in accordance with claim 14, wherein said X-ray source comprises a multi-focus X-ray source. 17. An XDI system in accordance with claim 14, wherein said lamella assembly further comprises a plurality of lamellae, wherein said at least one radiation-absorbing material layer comprises a porous material and said at least one radiation-transmitting material layer comprises a metal layer. 18. An XDI system in accordance with claim 17, wherein a number of lamellae is equal to a number of channels of said detector array. 19. An XDI system in accordance with claim 14, wherein said secondary collimator has a substantially planar profile. 20. An XDI system in accordance with claim 14, wherein said secondary collimator has an at least partially non-planar profile.