Grid module of a scattered-radiation grid, modular scattered-radiation grid, CT detector and CT system
A grid module of a scattered-radiation grid is disclosed. The scattered-radiation grid includes a number of grid modules disposed next to one another with a plurality of webs, especially for use in conjunction with a CT detector, a CT detector and a CT system with such a detector. In accordance with an embodiment of the invention, at the joining surfaces of the grid modules, the webs located there are provided with breakthroughs to compensate for a disproportionate reduction in scattered radiation.
1. A grid module of a scattered-radiation grid comprising a number of grid modules disposed next to one another, each of the grid modules being equipped with a plurality of grid webs, wherein, on at least one edge side of at least one of the grid modules, a grid web running along the at least one edge side is designed to be broken through at least partly at a plurality of sections.
2. The grid module of claim 1 , wherein the at least partly broken-through sections and non-broken-through sections are arranged alternately.
3. The grid module of claim 1 , wherein on at least one edge side of at least one of the grid modules, at least two grid webs are present with the at least partly broken-through sections opposite one another and disposed on the edge side.
4. The grid module of claim 1 , wherein the at least partly broken-through sections are disposed, viewed in the longitudinal direction of the webs, equidistant from one another.
5. The grid module of claim 1 , wherein exclusively one of the at least partly broken-through sections is disposed at at least one longitudinal position of the at least one grid web.
6. The grid module of claim 1 , wherein a number of the at least partly broken-through sections are disposed along the web height at a longitudinal position of the at least one grid web.
7. The grid module of claim 3 , wherein the at least partly broken-through sections on at least two opposing grid webs are disposed and are embodied in relation to their size such that all the at least partly broken-through sections of one grid web lie opposite a breakthrough-free surface of the respective other edge-side grid web.
8. The grid module of claim 1 , wherein, in relation to a height of the at least one edge-side grid web, the number of the at least partly broken-through sections is equal to the number of breakthrough-free surfaces.
9. The grid module of claim 1 , wherein at at least one of a minimum and maximum height of the at least one edge-side grid web, an end-to-end non-broken-through area is embodied over the entire length of the grid web.
10. The grid module of claim 1 , wherein grid webs adjacent to the grid webs disposed at the edge side also have lateral at least partly broken-through sections.
11. The grid module of claim 10 , wherein at least one of the number and overall surface of the at least partly broken-through sections in the grid webs reduces from the grid webs of the edge area of the grid module to the center of the grid module.
12. The grid module of claim 1 , wherein grid webs running exclusively parallel in one direction are provided.
13. The grid module of claim 1 , wherein grid webs crossing each other at right angles are provided.
14. The grid module of claim 1 , wherein at least one edge-side grid web is provided from outside with a plastic film.
15. A scattered-radiation grid for an x-ray detector of a CT system including a plurality of detector elements disposed in rows and columns over its surface, comprising:
at least two grid modules arranged next to one another, each of the at least two grid modules possessing a number of grid webs disposed next to one another with irradiation zones between them, and at least one edge-side grid web of at least one of the grid modules being adjacent to at least one other web disposed running in parallel next to one another on the edge side of another of the grid modules in absence of an irradiation zone arranged between them, the grid webs adjoining each other and, without an intervening irradiation zone, each including a plurality of lateral breakthroughs, wherein the grid modules are embodied in accordance with claim 1 .
16. A detector of a CT system with a modular-construction scattered-radiation grid, the scattered-radiation grid including the grid module of claim 1 .
17. A CT system comprising a detector including a modular-construction scattered-radiation grid, the scattered-radiation grid including grid modules of claim 1 .
18. The grid module of claim 2 , wherein on at least one edge side of at least one of the grid modules, at least two grid webs are present with the at least partly broken-through sections opposite one another and disposed on the edge side.
19. The grid module of claim 2 , wherein the at least partly broken-through sections are disposed, viewed in the longitudinal direction of the webs, equidistant from one another.
20. The grid module of claim 3 , wherein the at least partly broken-through sections are disposed, viewed in the longitudinal direction of the webs, equidistant from one another.
21. The grid module of claim 20 , wherein the at least partly broken-through sections and non-broken-through sections are arranged alternately.
22. The grid module of claim 20 , wherein on at least one edge side of at least one of the grid modules, at least two grid webs are present with the at least partly broken-through sections opposite one another and disposed on the edge side.
23. The grid module of claim 20 , wherein the at least partly broken-through sections are disposed, viewed in the longitudinal direction of the webs, equidistant from one another.
24. A scattered-radiation grid for an x-ray detector of a CT system including a plurality of detector elements disposed in rows and columns over its surface, comprising:
at least two grid modules arranged next to one another, each of the at least two grid modules possessing a number of grid webs disposed next to one another with irradiation zones between them, and at least one edge-side grid web of at least one of the grid modules being adjacent to at least one other web disposed running in parallel next to one another on the edge side of another of the grid modules in absence of an irradiation zone arranged between them, the grid webs adjoining each other and, without an intervening irradiation zone, each including a plurality of lateral breakthroughs.
25. The scattered-radiation grid of claim 24 , wherein the lateral breakthroughs of adjacent edge-side grid webs are disposed such that the breakthroughs of a grid web are each covered by the adjoining edge-side other grid web.
26. The scattered-radiation grid of claim 24 , wherein the breakthroughs are dimensioned in relation to their number and distribution so that the increased scattered-radiation reduction as a result of the presence of the double grid webs in the edge area of the grid module is compensated for by the breakthroughs.
27. The scattered-radiation grid of claim 25 , wherein the breakthroughs are dimensioned in relation to their number and distribution so that the increased scattered-radiation reduction as a result of the presence of the double grid webs in the edge area of the grid module is compensated for by the breakthroughs.
28. A detector of a CT system comprising the scattered-radiation grid of claim 24 .
29. A CT system comprising a detector including the scattered-radiation grid of claim 24 .