Scintillator having integrated collimator and method of manufacturing same

• US 7,247,856 B2
• Filed: 01/24/2006
• Issued: 07/24/2007
• Est. Priority Date: 04/30/2003
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Hoge, Michael F.
• Primary Examiner(s): Porta; David
• Assistant Examiner(s): Sung; Christine
• Application Number:
  US11/275,684
• Publication Number:
  US 20060097174A1
• Time in Patent Office: 546 Days
• Field of Search: 250/363.1, 250/515.1
• US Class Current: 250/363.1
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: G01T 1/1648 Ancillary equipment for scintillation cameras, e.g. reference markers, devices for removing motion artifacts, calibration devices adapted for flow studies G01T1/1647
• 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

Abstract

The present invention is directed to an integrated scintillator and collimator array for a CT detector. The integrated scintillator and collimator are fabricated from a manufacturing process or technique whereupon an array of scintillator material is positioned on a tooling base such that a collimator mold housing having a collimator mold therein may be positioned on the block of scintillator material. The block and mold housing are then aligned allowing a collimator mixture to be disposed into the mold. The collimator mixture is then allowed to cure to form an integrated scintillator and collimator.

Claims

1. A method of manufacturing a detector having an integrated scintillator and collimator, the method comprising the steps of:

forming a scintillator pack; and

molding a collimator to the scintillator pack to form an integrated scintillator and collimator.

2. The method of claim 1 further comprising the step of milling a top reflector surface of the scintillator pack prior to molding the collimator to the scintillator pack.

3. The method of claim 1 comprising the step of fastening a collimator mold to the scintillator pack prior to the step of molding the collimator mold having a plurality of cavities.

4. The method of claim 3 further comprising the step of filling the mold cavities with a collimator mixture.

5. The method of claim 4 further comprising the step of removing air from the collimator mold using a vacuum pump prior to filling the mold cavities with the collimator mixture.

6. The method of claim 4 wherein the collimator mixture includes a combination of tungsten and epoxy.

7. The method of claim 3 wherein the collimator mold includes a series of parallel-aligned cavities designed to receive a collimator mixture.

8. The method of claim 3 wherein the collimator mold is formed of stainless steel.

9. A method of CT detector manufacture, the method comprising the step of molding a collimator directly to an x-ray reception surface of a scintillator.

10. The method of claim 9 wherein the step of molding includes the steps of:

placing a scintillator having an array of scintillator elements on a tooling base;

positioning a collimator mold having a plurality of cavities on the scintillator;

filling the collimator mold cavities with a collimator composition; and

curing the collimator composition.

11. The method of claim 10 further comprising the step of orienting the scintillator and the collimator mold with respect to a set of pins and bore datums.

12. The method of claim 10 further comprising the step of removing air from the collimator mold cavities by vacuum pumping the air through an evacuation gate before the step of filling.

13. The method of claim 10 wherein the collimator composition includes tungsten and epoxy.

14. The method of claim 13 wherein the tungsten has a powder form.