X-ray detector/stray radiation grid and gamma detector/collimator arrangements

• US 20030076929A1
• Filed: 10/21/2002
• Published: 04/24/2003
• Est. Priority Date: 10/23/2001
• Status: Active Grant

• Current Assignee: Siemens Healthcare GMBH (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Hoheisel, Martin, Sklebitz, Hartmut
• Granted Patent: US 6,778,632 B2
• Time in Patent Office: Days
• US Class Current: 378/98.8
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 30/00 Apparatus for additive manufacturing; Details thereof or accessories therefor
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G21K 1/025 using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation

Abstract

In an arrangement having an X-ray detector or a gamma detector with detector elements arranged in a matrix in row and column directions that form a detector surface with detection regions that are sensitive to X-rays or gamma radiation and insensitive intermediate regions, and a stray radiation grid or collimator of absorbent structure elements that is arranged over the detector surface, the absorbent structure elements proceed over the intermediate regions and are fashioned such that their detector-side center-to-center spacing in the row direction and/or column direction is greater by a whole-numbered factor than the center-to-center spacing of the detector elements in the same direction, and/or sections of the absorbent structure elements that proceed in one direction exhibit a lower height than sections that proceed in the respectively other direction. Moiré effects can be avoided in the image exposure and, at the same time, a reduced primary radiation absorption by the stray radiation grid or collimator is achieved even given a moving radiation source.

Claims

1. A detector arrangement comprising:

a radiation detector selected from the group consisting of X-ray detectors and gamma detectors, said radiation detector having a plurality of detector elements disposed in a matrix in row and column directions which form a detector surface with detection regions that are sensitive to radiation, selected from the group consisting of X-rays and gamma radiation, and intermediate regions which are insensitive to said radiation; and

a imaging radiation-passing structure, selected from the group consisting of stray radiation grids and collimators, disposed over said detector surface and having absorbent structural elements which proceed over said intermediate regions and which have a center-to-center spacing, at a side of said imaging radiation-passing structure facing said radiation detector, in at least one of said row direction and said column direction, which is greater by a whole-numbered factor than a center-to-center spacing of said detector elements in said one of said row direction and column direction.

2. A detector arrangement as claimed in claim 1 wherein said absorbent structural elements have sections proceeding in said one of said row direction and column direction and sections proceeding in the other of said row direction and column direction, and wherein said sections proceeding in said one direction have a lower height than said sections proceeding in the other direction.

3. A detector arrangement as claimed in claim 1 wherein said imaging radiation-passing structure is applied directly on said detector surface.

4. A detector arrangement as claimed in claim 1 further comprising an intermediate layer firmly connected to said detector surface, said imaging radiation-passing structure being disposed on said intermediate layer.

5. A detector arrangement as claimed in claim 1 wherein said absorbent structural elements proceed in straight lines over said detector surface.

6. A detector arrangement as claimed in claim 5 wherein said absorbent structural elements form a cellular grid.

7. A detector arrangement as claimed in claim 1 wherein said absorbent structural elements are stepped over said detector surface.

8. A detector arrangement as claimed in claim 1 wherein said absorbent structural elements comprise a plurality of discrete elements which do not cross each other and do not touch each other.

9. A detector arrangement as claimed in claim 8 further comprising cross-webs disposed between said discrete elements for stabilizing said discrete elements.

10. A detector arrangement as claimed in claim 1 wherein said absorbent structural elements have interspaces therebetween, and further comprising a material filling said interspaces which is substantially transparent to said radiation.

11. A detector arrangement as claimed in claim 1 wherein said imaging radiation-passing structure is a focused structure.

12. 1. A detector arrangement comprising:

a radiation detector selected from the group consisting of X-ray detectors and gamma detectors, said radiation detector having a plurality of detector elements disposed in a matrix in row and column directions which form a detector surface with detection regions that are sensitive to radiation, selected from the group consisting of X-rays and gamma radiation, and intermediate regions which are insensitive to said radiation; and

a imaging radiation-passing structure, selected from the group consisting of stray radiation grids and collimators, disposed over said detector surface and having absorbent structural elements which proceed over said intermediate regions and having sections proceeding in said row direction and section proceeding in said column direction, and wherein the sections proceeding in one of said row direction and said column direction have a lower height than said sections proceeding in the other of said row direction and column direction.

13. A detector arrangement as claimed in claim 12 wherein said imaging radiation-passing structure is applied directly on said detector surface.

14. A detector arrangement as claimed in claim 12 further comprising an intermediate layer firmly connected to said detector surface, said imaging radiation-passing structure being disposed on said intermediate layer.

15. A detector arrangement as claimed in claim 12 wherein said absorbent structural elements proceed in straight lines over said detector surface.

16. A detector arrangement as claimed in claim 15 wherein said absorbent structural elements form a cellular grid.

17. A detector arrangement as claimed in claim 12 wherein said absorbent structural elements are stepped over said detector surface.

18. A detector arrangement as claimed in claim 12 wherein said absorbent structural elements comprise a plurality of discrete elements which do not cross each other and do not touch each other.

19. A detector arrangement as claimed in claim 18 further comprising cross-webs disposed between said discrete elements for stabilizing said discrete elements.

20. A detector arrangement as claimed in claim 12 wherein said absorbent structural elements have interspaces therebetween, and further comprising a material filling said interspaces which is substantially transparent to said radiation.

21. A detector arrangement as claimed in claim 12 wherein said imaging radiation-passing structure is a focused structure.