Flexible antiscatter grid

• US 9,826,947 B2
• Filed: 02/24/2015
• Issued: 11/28/2017
• Est. Priority Date: 02/24/2015
• Status: Active Grant

• Current Assignee: CareStream Health Incorporated
• Original Assignee: CareStream Health Incorporated
• Inventors: Young, Ted G.
• Primary Examiner(s): Ho, Allen C.
• Application Number:
  US14/629,512
• Publication Number:
  US 20160247590A1
• Time in Patent Office: 1,008 Days
• Field of Search: 378 19, 378 988, 378147, 378149, 378154, 378155, 25037009
• CPC Class Codes: A61B 6/4291 the detector being combined with a grid or grating
• CPC Class Codes: G21K 1/02 using diaphragms, collimators
• CPC Class Codes: G21K 1/025 using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
• CPC Class Codes: G21K 1/10 Scattering devices; Absorbing devices; Ionising radiation filters

Abstract

An antiscatter grid for radiological imaging, the grid formed as a stack of two or more sheets having a flexible substrate, wherein each sheet has spaced-apart opaque cavities, each opaque cavity containing a radio-opaque material. The opaque cavities define a plurality of channels that extend through the sheets to allow ionizing radiation to pass therethrough. Magnets disposed along the sheets couple each sheet to one or more neighboring sheets of the stack.

Claims

1. An antiscatter grid for radiological imaging, the antiscatter grid comprising:

a stack of two or more flexible sheets, wherein each flexible sheet comprises;

(i) a plurality of spaced apart opaque cavities, each opaque cavity containing a radio-opaque material, wherein the plurality of spaced apart opaque cavities define a plurality of channels extending through the stack of two or more flexible sheets that are transmissive to ionizing radiation; and

(ii) a plurality of magnets that are disposed in or on each of the stack of two or more flexible sheets to couple each flexible sheet to one or more neighboring flexible sheets of the stack.

2. The antiscatter grid of claim 1, wherein the plurality of channels converge toward a focal point.

3. The antiscatter grid of claim 1, wherein the plurality of magnets are disposed in the plurality of spaced apart opaque cavities in the stack of two or more flexible sheets.

4. The antiscatter grid of claim 3, wherein the plurality of magnets comprise a liquid magnetizable material.

5. The antiscatter grid of claim 1, wherein the plurality of magnets include one or more electromagnets.

6. The antiscatter grid of claim 1, wherein the stack of two or more flexible sheets is configured to be placed into a moveable bucky.

7. The antiscatter grid of claim 1, wherein the radio-opaque material comprises is selected from the group consisting of tungsten and lead.

8. The antiscatter grid of claim 1, wherein a major surface of the stack of two or more flexible sheets comprises a protective coating thereon.

9. The antiscatter grid of claim 1, wherein the plurality of spaced apart opaque cavities are formed using a laser.

10. The antiscatter grid of claim 1, further comprising inter-sheet spacers between flexible sheets in the stack of two or more flexible sheets.

11. The antiscatter grid of claim 1, wherein the plurality of spaced apart opaque cavities are formed by simultaneously forming holes through the stack of two or more flexible sheets.

12. The antiscatter grid of claim 1, wherein the plurality of spaced apart opaque cavities are formed while bending the stack of two or more flexible sheets.

13. The antiscatter grid of claim 1, wherein the plurality of spaced apart opaque cavities comprise a substantially uniform size and spacing.

14. The antiscatter grid of claim 1, wherein the plurality of spaced apart opaque cavities comprise varied size or spacing along the stack of two or more flexible sheets.

15. The antiscatter grid of claim 1, wherein the stack of two or more flexible sheets comprise sufficient flexibility to be wrapped about a curved surface.

16. A radiological imaging system comprising:

an x-ray source;

an x-ray detector; and

a first antiscatter grid, the first antiscatter grid comprising a stack of two or more flexible sheets, each flexible sheet comprising;

a plurality of spaced-apart opaque cavities, wherein each opaque cavity contains a radio-opaque material, and wherein the plurality of spaced apart opaque cavities define a plurality of radio-lucent channels extending through the first antiscatter grid; and

a plurality of magnets disposed along the flexible sheet to couple the flexible sheet to one or more neighboring flexible sheets of the stack.

17. The radiological imaging system of claim 16, further comprising a transport assembly, the transport assembly energizable to move the first antiscatter grid to a position in front of at least a portion of the x-ray detector and to a position behind at least a portion of the x-ray detector.

18. The radiological imaging system of claim 17, further comprising one or more combs of wires to separate the stack of two or more flexible sheets as the transport assembly moves the first antiscatter grid.

19. The radiological imaging system of claim 18, wherein the one or more combs of wires extend along one or more side edges of the first antiscatter grid.

20. The radiological imaging system of claim 17, further comprising a second antiscatter grid, wherein the transport assembly is further energizable to move at least a portion of the second antiscatter grid to the position in front of the x-ray detector.