Patent Number: 
Section: claims

1. An X-ray imaging apparatus comprising:a splitting element configured to spatially split an X-ray into multiple X-ray beams;a shielding unit including a shielding elements configured to block part of an X-ray acquired by the splitting element;a detecting unit including a pixel group, the pixel group including a first detection pixel and a second detection pixel, the pixels being configured to detect the intensity of the X-ray beam transmitted through the shielding unit; anda computing unit configured to compute X-ray transmittance of a test object on the basis of the intensity of the X-ray detected by the second detection pixel,wherein part of the X-ray beam detected at the first detection pixel is blocked by the shielding elements and the X-ray beam detected at the second detection pixel adjoining the first detection pixel is not blocked by the shielding element. 2. The X-ray imaging apparatus according to claim 1, wherein the shielding element is not disposed on the boundary between the first detection pixel and the second detection pixel. 3. The X-ray imaging apparatus according to claim 1, wherein the X-ray beam incident on the first detection pixel and the X-ray beam incident on the second detection pixel are split. 4. The X-ray imaging apparatus according to claim 1, wherein the X-ray beam incident on the first detection pixel and the X-ray beam incident on the second detection pixel are not split. 5. The X-ray imaging apparatus according to claim 1, wherein,the detection pixels not blocked by the shielding elements are linearly aligned in a first direction and a second direction orthogonal to the first direction, andtransmitting parts of the splitting element are linearly aligned in the first direction and disposed in a zigzag pattern in the second direction. 6. An X-ray imaging apparatus according to claim 1,wherein the positions of X-ray beams incident on the first detection pixels differ from the positions X-ray beams incident on the second detection pixels, and part of the X-ray beams incident on the first detection pixels is blocked by the shielding elements. 7. The X-ray imaging apparatus according to claim 1, wherein the first detection pixels include a region that is shielded from the X-ray beams by the shielding elements and a region that the X-ray beams are allowed to enter, and a dividing line between the region that is shielded from the X-ray beams and the region that the X-ray beams are allowed to enter is arranged not obliquely. 8. The X-ray imaging apparatus according to claim 1, wherein the detecting unit includes a plurality of pixel groups. 9. The X-ray imaging apparatus according to claim 8, wherein the computing unit computes an image of the test object associated with a phase shift of the X-ray beams based intensities of the X-ray beams detected at the first detection pixel and the second detection pixel. 10. An imaging method for an X-ray imaging apparatus, comprising the steps of:blocking part of spatially split X-ray beams by a shielding unit having a shielding elements;detecting the intensity of the X-ray beams transmitted through the shielding unit by a detecting unit including a pixel group, the pixel group including a first detection pixel and a second detection pixel;detecting an X-ray beam of which part is blocked by the shielding elements by the first detection pixel and detecting an X-ray beam of which part is not blocked by the shielding elements by the second detection pixel adjoining the first detection pixel; andcalculating X-ray transmittance of a test object on the basis of the intensity an X-ray beam detected by the second detection pixel. 11. The imaging method according to claim 10, further comprising a step of:computing a differential phase contrast image or a phase contrast image of the test object on the basis of the intensities of X-ray beam detected by the first detection pixel and the second detection pixel. 12. The imaging method according to claim 10, wherein the first detection pixels include a region that is shielded from the X-ray beams by the shielding elements and a region that the X-ray beams are allowed to enter, and a dividing line between the region that is shielded from the X-ray beams and the region that the X-ray beams are allowed to enter is arranged not obliquely. 13. The imaging method according to claim 10, wherein the detecting unit includes a plurality of pixel groups. 14. An X-ray imaging apparatus comprising:a splitting element configured to spatially split an X-ray;a shielding unit including a plurality of shielding element configured to block part of X-ray beams acquired by the splitting element; anda detecting unit including a plurality of pixel groups, each pixel group including a first detection pixel and a second detection pixel, the pixels being configured to detect the intensity of the X-ray beam transmitted through the shielding unit; anda computing unit configured to compute X-ray transmittance of a test object on the basis of the intensity of the X-ray detected by the second detection pixel,wherein the shielding elements are disposed on the first detection pixel and are not disposed on the second detection pixel. 15. The X-ray imaging apparatus according to claim 14, wherein the first detection pixels include a region that is shielded from the X-ray beams by the shielding elements and a region that the X-ray beams are allowed to enter, and a dividing line between the region that is shielded from the X-ray beams and the region that the X-ray beams are allowed to enter is arranged not obliquely. 16. An X-ray imaging apparatus comprising:a splitting element configured to spatially split an X-ray into multiple X-ray beams;a shielding unit including a plurality of shielding elements configured to block part of an X-ray acquired by the splitting element; anda detecting unit including a plurality of pixel groups, each pixel group including a first detection pixel and a second detection pixel, the pixels being configured to detect the intensity of the X-ray beam transmitted through the shielding unit,wherein part of the X-ray beam detected at the first detection pixel is blocked by the shielding elements and the X-ray beam detected at the second detection pixel adjoining the first detection pixel is not blocked by the shielding elements, andwherein, among the plurality of pixel groups, a first detection pixel and a second detection pixel included in each pixel group are alternately arranged in the detecting unit in one or more directions.