X-ray device
An embodiment of the invention relates to an X-ray device, more particularly for phase-contrast imaging in the medical sector. In at least one embodiment, the X-ray device includes an X-ray radiation source, a coherence grid, a phase grid and an X-ray detector from a number of pixels arranged in a matrix, the pixels including a lens grid.
1. An x-ray device, comprising:
an x-ray radiation source;
a coherence grating;
a phase grating; and
an x-ray detector made of a number of pixels disposed in a matrix-like manner; and
a lens grating assembled from prisms, wherein the lens grating is disposed between the phase grating and the x-ray detector and the lens grating includes two sub-gratings arranged in an optical axis direction, of which a first sub-grating deflects x-ray beams which have experienced a phase shift by the phase grating and a second sub-grating deflects x-rays beams which passed the phase grating without being influenced.
2. The x-ray device of claim 1 , wherein a focus plane is assigned to the lens grating and wherein the x-ray detector is positioned in the focus plane.
3. The x-ray device of claim 1 , further comprising:
an absorption grating, positioned between the lens grating and the x-ray detector.
4. The x-ray device of claim 3 , wherein a focus plane is assigned to the lens grating and wherein the absorption grating is positioned in the focus plane.
5. The x-ray device of claim 1 , wherein the prisms include a triangular or trapezoidal base area.
6. The x-ray device of claim 1 , wherein the prisms include a regular arrangement.
7. The x-ray device of claim 6 , wherein the regular arrangement of prisms comprises prisms with different base areas.
8. The x-ray device of claim 6 , wherein, in each case, a plurality of prisms mesh in such a way that elongate meandering structures are formed in an optical axis direction.
9. The x-ray device of claim 1 , wherein the prisms are formed onto a base plate.
10. The x-ray device of claim 9 , wherein at least one lateral face of the prisms is inclined with an angle of inclination of between 5° and 15° with respect to the surface normal of the base plate.
11. The x-ray device of claim 1 , wherein the prisms are embodied as slanted prisms.
12. The x-ray device of claim 1 , wherein the lens grating is assembled from a number of clessidra lenses.
13. The x-ray device of claim 1 , wherein gold, nickel or silicon is used as the main material for the lens grating.
14. The x-ray device of claim 1 , wherein the x-ray device is for phase-contrast imaging in the medical sector.
15. The x-ray device of claim 1 , wherein the lens grating includes an arrangement of positive lenses, each lens configured to focus x-ray radiation to precisely one pixel of the x-ray detector.
16. The x-ray device of claim 1 , wherein the lens grating comprises a regular arrangement of columns of positive lenses focusing in one dimension, wherein each one of the columns of positive lenses focuses x-ray radiation in the scope thereof onto precisely one column of pixels of the x-ray detector.