Patent Number: 
Section: claims

1. An X-ray detector for phase contrast imaging, the X-ray detector comprising:a scintillation device comprising a wafer substrate having a plurality of grooves spaced apart from each other, wherein each groove of the plurality of grooves extends to a depth along a first direction from a first side of the scintillation device into the wafer substrate, each groove of the plurality of grooves being at least partially filled with a scintillation material; anda photodetector comprising a plurality of photosensitive pixels optically coupled to the scintillation device;wherein a primary axis is substantially parallel to a surface normal vector of the scintillation device;wherein first directions of at least a part of the plurality of grooves are different from the primary axis, such that at least a part of the plurality of grooves is tilted with respect to the primary axis; andwherein an angle between a first direction of a groove arranged in a center region of the scintillation device and the primary axis is smaller than an angle between a first direction of a groove arranged in an outer region of the scintillation device and the primary axis. 2. The X-ray detector according to claim 1, wherein grooves of the plurality of grooves arranged in an outer region are more tilted with respect to the primary axis than grooves of the plurality of grooves arranged in a center region. 3. The X-ray detector according to claim 1, wherein at least one groove of the plurality of grooves has a first direction parallel to the primary axis; and wherein the at least one groove of the plurality of grooves is arranged in a center region of the scintillation device. 4. The X-ray detector according to claim 1, wherein an angle between a first direction of a groove of the plurality of grooves and the primary axis increases with an increasing distance of the groove of the plurality of grooves from a center region to an outer region of the scintillation device. 5. The X-ray detector according claim 1, wherein each groove of the plurality of grooves is completely filled with a scintillation material. 6. The X-ray detector according to claim 1, wherein each groove of the plurality of grooves is divided into a plurality of sections along a longitudinal extension direction. 7. The X-ray detector according to claim 1, wherein at least a part of the plurality of grooves has at least one of the following shapes: a rectangular shape, a trapezoidal shape, a tubular shape, a cylindrical shape, a conical shape, and an asymmetric shape. 8. The X-ray detector according to claim 1, wherein the detector comprises a flat detector. 9. The X-ray detector according to claim 1, wherein the wafer substrate comprises silicone; and/or wherein the scintillation material comprises at least one of CsI, NaI, CsI(Tl), CsI(Na), CsI(pure), CsF, KI(Tl), LiI(Eu) and gadolinium oxysulfide. 10. The X-ray detector according to claim 1, wherein each groove of the plurality of grooves has a depth of about 0.5 mm to 5 mm; and/or wherein each groove of the plurality of grooves has a width of about 1 μm to 200 μm. 11. The X-ray detector according to claim 1, wherein each groove of the plurality of grooves has a length along a longitudinal extension direction that corresponds to a length of a photosensitive pixel of the plurality of photosensitive pixels. 12. A phase contrast imaging system, comprising:an X-ray source for emitting a beam of X-rays centered around an optical axis;an X-ray detector comprising:a scintillation device comprising a wafer substrate having a plurality of grooves spaced apart from each other, wherein each groove of the plurality of grooves extends to a depth along a first direction from a first side of the scintillation device into the wafer substrate, each groove of the plurality of grooves being at least partially filled with a scintillation material; anda photodetector comprising a plurality of photosensitive pixels optically coupled to the scintillation device, wherein a primary axis of the X-ray detector is substantially parallel to a surface normal vector of the scintillation device, wherein the first direction of at least a part of the plurality of grooves is different from the primary axis, such that at least a part of the plurality of grooves is tilted with respect to the primary axis, and wherein an angle between the first direction of a groove of the plurality of grooves arranged in a center region of the scintillation device and the primary axis is smaller than an angle between the first direction of a groove of the plurality of grooves arranged in an outer region of the scintillation device and the primary axis; andat least one grating arranged between the X-ray source and the X-ray detector, wherein the primary axis of the X-ray detector is substantially parallel to the optical axis. 13. The phase contrast imaging system according to claim 12, wherein the X-ray detector is arranged such that the first direction of each groove of the plurality of grooves is oriented towards a focal spot of the X-ray source. 14. A method of fabricating an X-ray detector, the method comprising:forming a plurality of grooves into a wafer substrate of a scintillation device, such that the plurality of grooves are spaced apart from each other and such that each groove of the plurality of grooves extends to a depth along a first direction from a surface of the wafer substrate into the wafer substrate;at least partially filling each groove of the plurality of grooves with a scintillation material; andarranging the wafer substrate with the at least partially filled plurality of grooves on a photodetector;wherein the X-ray detector comprises a primary axis parallel to a surface normal vector of the wafer substrate;wherein the first direction of at least a part of the plurality of grooves is different from the primary axis, such that at least a part of the plurality of grooves is tilted with respect to the primary axis, andwherein an angle between the first direction of a groove of the plurality of grooves arranged in a center region of the scintillation device and the primary axis is smaller than an angle between the first direction of a groove of the plurality of grooves arranged in an outer region of the scintillation device and the primary axis.