X-ray detector with an arrangement of a pixelated second electrode and a scattered radiation grid

Patent metadata

Field	Value
Publication number	US-2018199899-A1
Application number	US-201715856162-A
Country	US
Kind code	A1
Filing date	Dec 28, 2017
Priority date	Jan 17, 2017
Publication date	Jul 19, 2018
Grant date	—

Abstract

An X-ray detector includes a stack arrangement with a scattered radiation grid and a planar converter element including a first surface and a second surface. The converter element includes a first electrode embodied on the first surface and a pixelated second electrode with two adjacent first electrode elements. The two adjacent first electrode elements include a first width and a first length and the two adjacent first electrode elements are embodied the second surface opposite the first surface. The scattered radiation grid includes a grid wall with a thickness along the boundary between the two adjacent first electrode elements. The grid wall is arranged to be substantially perpendicular on the first surface and, in a projection, substantially parallel to the direction of incidence of the radiation and to the surface normal of the first surface. The grid wall at least partially overlaps the two adjacent first electrode elements.

First claim

What is claimed is:

1 . An X-ray detector, comprising
a scattered radiation grid; and a planar converter element including a first surface and a second surface, the scattered radiation grid and the planar converter element being arranged in a stack arrangement, the planar converter element including
a first electrode embodied on the first surface,
a pixelated second electrode including two adjacent first electrode elements, wherein the two adjacent first electrode elements include a first width and a first length and wherein the two adjacent first electrode elements are embodied on the second surface opposite the first surface, and
the scattered radiation grid including
a grid wall with a wall thickness along a boundary between the two adjacent first electrode elements, the grid wall being arranged substantially perpendicular on the first surface and, in a projection, substantially parallel to a direction of incidence of radiation and to a surface normal of the first surface, the grid wall at least partially overlapping the two adjacent first electrode elements.

2 . The X-ray detector of claim 1 , wherein a second electrode element with a second width and a second length is embodied on the second surface outside the projection.

3 . The X-ray detector of claim 2 , wherein a first planar extension of one of the adjacent first electrode elements is relatively greater than a second planar extension of the second electrode element.

4 . The X-ray detector of claim 2 , wherein at least one of
the first width is relatively greater than the second width and the first length is relatively greater than the second length.

5 . The X-ray detector of claim 1 , wherein one of the adjacent first electrode elements comprises a first effective pixel area, defined by gradients of field lines in regions bounding at least one of the adjacent first electrode element and the adjacent second electrode element.

6 . The X-ray detector of claim 5 , wherein the second electrode element comprises a second effective pixel area, defined by gradients of field lines in regions bounding at least one of the adjacent first electrode element and the adjacent second electrode element.

7 . The X-ray detector of claim 5 , wherein the first effective pixel area is defined by shading of incident radiation by the scattered radiation grid.

8 . The X-ray detector of claim 6 , wherein the first effective pixel area and the second effective pixel area are of equal size.

9 . The X-ray detector of claim 6 , wherein the first effective pixel area and the second effective pixel area are of different sizes.

10 . The X-ray detector of claim 9 , wherein a surface area of the first effective pixel area and a surface area of the second effective pixel area differ by a maximum of 30 percent.

11 . The X-ray detector of claim 6 , wherein an extension of the first effective pixel area, at least one of along the first width and along the first length, minus an overlapping region of the first electrode element with the grid wall in a substantially perpendicular projection and an extension of an adjacent second effective pixel area along a second width or along a second length, are of equal size.

12 . The X-ray detector of claim 5 , wherein an extension of at least one of a first effective pixel area and a second effective pixel area is based on a quotient of an extension a grid opening of the scattered radiation grid and a joint number of the first electrode elements and the second electrode elements along the extension of the grid opening of the scattered radiation grid.

13 . The X-ray detector of claim 2 , wherein an extension of one of the adjacent first electrode elements is based on a sum of the first width or the first length and an extension between two adjacent first electrode elements or between the one adjacent first electrode elements and the adjacent second electrode element.

14 . The X-ray detector of claim 1 , wherein a shade-capture structure is arranged between the scattered radiation grid and the planar converter element.

15 . The X-ray detector of claim 14 , further comprising a lighting unit arranged between the scattered radiation grid and the first electrode.

16 . A medical device comprising:
the X-ray detector of claim 1 .

17 . The X-ray detector of claim 3 , wherein at least one of
the first width is relatively greater than the second width and the first length is relatively greater than the second length.

18 . The X-ray detector of claim 2 , wherein the second electrode element comprises a second effective pixel area, defined by gradients of field lines in regions bounding at least one of the adjacent first electrode element and the adjacent second electrode element.

19 . The X-ray detector of claim 6 , wherein a first effective pixel area is defined by shading of incident radiation by the scattered radiation grid.

20 . The X-ray detector of claim 7 , wherein the first effective pixel area and a second effective pixel area are of equal size.

21 . The X-ray detector of claim 19 , wherein a first effective pixel area and a second effective pixel area are of equal size.

22 . The X-ray detector of claim 7 , wherein the first effective pixel area and a second effective pixel area are of different sizes.

23 . The X-ray detector of claim 21 , wherein the first effective pixel area and the second effective pixel area are of different sizes.

24 . A medical device comprising:
the X-ray detector of claim 2 .

25 . A medical device comprising:
the X-ray detector of claim 15 .

Assignees

• Siemens Healthcare Gmbh

Inventors

• Ergler Thorsten
• Goderer Edgar
• Kreisler Bjorn
• Labayen De Inza Miguel
• Schroter Christian
• Sievers Peter
• Stadlthanner Kurt

Classifications

• A61B6/4291 Primary

  the detector being combined with a grid or grating · CPC title

• A61B6/4208

  characterised by using a particular type of detector · CPC title

• A61B6/032

  Transmission computed tomography [CT] · CPC title

• A61B6/4233 Primary

  using matrix detectors · CPC title

• G21K1/025

  using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation · CPC title