Patent Number: 
Section: claims

1. An X-ray grating configured for use in an X-ray imaging apparatus, comprising:a silicon-based base layer;a plurality of silicon-based ridges on a surface of the silicon-based base layer, wherein the plurality of silicon-based ridges form a plurality of trenches wherein a trench of the plurality of trenches is between two silicon-based ridges of the plurality of silicon-based ridges; anda plurality of silicon-based bridges extending between adjacent silicon-based ridges across a trench between adjacent silicon-based ridges, wherein each silicon-based ridge of the plurality of silicon-based ridges is connected to at least one adjacent silicon-based ridge of the plurality of silicon-based ridges by at least one of a silicon-based bridge of the plurality of silicon-based bridges and wherein at least one of a plurality of four adjacent trenches does not have any silicon-based bridges. 2. The X-ray grating, as recited in claim 1, wherein the silicon-based base layer is curved with a radius of curvature of less than 50 cm. 3. The X-ray grating, as recited in claim 1, wherein every silicon-based ridge of the plurality of silicon-based ridges is connected to only one adjacent silicon-based ridge by at least one of a silicon-based bridge of the plurality of silicon-based bridges. 4. The X-ray grating, as recited in claim 1, wherein the plurality of silicon-based ridges have a height and width, wherein a ratio of the height to the width is greater than 5:1. 5. The X-ray grating, as recited in claim 1, wherein the silicon-based base layer has a thickness of no more than 70 microns. 6. The X-ray grating, as recited in claim 1 further comprising at least one metallic layer between the silicon-based ridges. 7. The X-ray grating, as recited in claim 6, wherein the at least one metallic layer comprises at least one of gold, lead, platinum, tungsten, or nickel. 8. The X-ray grating, as recited in claim 6, wherein the at least one metallic layer comprises a conformal layer formed over the plurality of silicon-based ridges. 9. The X-ray grating, as recited in claim 6, wherein the at least one metallic layer completely fills trenches between the plurality of silicon-based ridges. 10. The X-ray grating, as recited in claim 1, further comprising a mounting substrate with a curved surface, wherein the silicon-based base layer is attached to the curved surface of the mounting substrate by an adhesive. 11. An X-ray grating configured for use in an X-ray imaging apparatus, comprising:a silicon-based base layer with a thickness of no more than 70 microns; anda plurality of silicon-based ridges on a surface of the silicon-based base layer, wherein a trench of a plurality of trenches is between a pair of adjacent silicon-based ridges of the plurality of silicon-based ridges. 12. The X-ray grating, as recited in claim 11, further comprising a plurality of silicon-based bridges extending between adjacent silicon-based ridges, wherein each silicon-based ridge of the plurality of silicon-based ridges is connected to at least one adjacent silicon-based ridge of the plurality of silicon-based ridges by at least one of a silicon-based bridge of the plurality of silicon-based bridges and wherein every second, third, fourth, or fifth trench does not have any silicon-based bridges. 13. The X-ray grating, as recited in claim 11, wherein the plurality of silicon-based ridges have a height and width, wherein a ratio of the height to the width is greater than 5:1. 14. The X-ray grating, as recited in claim 11, wherein the silicon-based base layer is curved with a radius of curvature of less than 50 cm. 15. The X-ray grating, as recited in claim 11, further comprising a mounting substrate with a curved surface, wherein the silicon-based base layer is attached to the curved surface of the mounting substrate. 16. The X-ray grating, as recited in claim 15, wherein the silicon-based base layer is attached to the curved surface of the mounting substrate by an adhesive. 17. The X-ray grating, as recited in claim 11, further comprising a metallic deposition in the trenches of the plurality of trenches. 18. A method of forming an X-ray grating, comprising:etching a silicon-based substrate to form a plurality of silicon-based ridges with trenches between the plurality of silicon-based ridges, and forming a base layer, wherein the plurality of silicon-based ridges are connected to the base layer and wherein the base layer has a thickness of no more than 70 microns. 19. The method, as recited in claim 18, wherein a plurality of bridges extend between adjacent silicon-based ridges, wherein each silicon-based ridge of the plurality of silicon-based ridges is connected to at least one adjacent silicon-based ridge of the plurality of silicon-based ridges by at least one of a bridge of the plurality of bridges and wherein every second, third, fourth, or fifth trench does not have any silicon-based bridges. 20. The method, as recited in claim 18, wherein the etching the silicon-based substrate, comprises etching trenches in a first side of the silicon-based substrate and etching a second side of the silicon-based substrate so that the base layer has a thickness of no more than 70 microns. 21. The method, as recited in claim 18, further comprising attaching the base layer to a curved surface. 22. The method, as recited in claim 21, wherein the attaching the base layer to a curved surface is by using an adhesive. 23. The method, as recited in claim 21, wherein the attaching the base layer to the curved surface forms a curve in the base layer with a radius of curvature of no more than 50 cm. 24. The method, as recited in claim 18, further comprising depositing a metal deposition in the trenches.