Collimator and detector for computed tomography systems

• US 6,134,301 A
• Filed: 06/22/1998
• Issued: 10/17/2000
• Est. Priority Date: 12/26/1996
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Mruzek, Michael Thomas, Hoffman, David M.
• Primary Examiner(s): Porta, David P.
• Application Number:
  US09/102,459
• Time in Patent Office: 848 Days
• Field of Search: 378/145, 378/147-152, 378/154, 378/155, 378/183, 378/185, 378/186, 378/207, 378/19
• US Class Current: 378/147
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/06 Diaphragms
• CPC Class Codes: A61B 6/4291 the detector being combined with a grid or grating
• CPC Class Codes: G01N 2223/419 computed tomograph
• CPC Class Codes: G01N 23/046 using tomography, e.g. computed tomography [CT]

Abstract

The present invention, in one form, is a scatter collimator for a computed tomography system including an x-ray source. The scatter collimator is positioned between a detector array and an object to be imaged. The scatter collimator includes a housing, a plurality of attenuating blades and a plurality of attenuating wires. The blades and wires are mounted to the housing, and oriented substantially perpendicular to each other. Particularly, the blades and wires form a two-dimensional shielding grid. The blades also are oriented so that they are radially and focally aligned with the x-ray source. A detector element of the detector array is secured to the housing so that the blades and wires are between the detector element and the x-ray source. The detector element, in one form, includes a scintillation element which is coated with a light-retaining material.

Claims

1. A combing tool and collimator for use in connection with a computed tomography system, said collimator including a plurality of attenuating blades, each of said blades extending substantially parallel to an adjacent one of said blades, said combing tool comprising a handle and a plurality of substantially parallel teeth having cavities therebetween extending from said handle, said tool configured to verify alignment of said collimator blades.

2. A combing tool and collimator in accordance with claim 1 wherein said teeth are configured to be inserted between adjacent said attenuating blades.

3. A combing tool and collimator in accordance with claim 1 wherein each of said cavities is configured to receive at least one said attenuating blade.

4. A combing tool and collimator in accordance with claim 1 wherein said teeth each have a substantially different thickness.

5. A combing tool and collimator for use in connection with a computed tomography system, said collimator including a plurality of attenuating blades, each of said blades extending substantially parallel to an adjacent one of said blades, and said combing tool comprising means for verifying alignment of said collimator blades.

6. A combing tool and collimator for use in connection with a computed tomography system, said collimator including a plurality of attenuating blades, each of said blades extending substantially parallel to an adjacent one of said blades, and said combing tool comprising a plurality of substantially parallel teeth having cavities therebetween and configured to verify alignment of said collimator blades.

7. A combing tool and collimator in accordance with claim 6 wherein said teeth are configured to be inserted between adjacent said attenuating blades.

8. A combing tool and collimator in accordance with claim 6 wherein each of said cavities is configured to receive at least one said attenuating blade.

9. A combing tool and collimator in accordance with claim 6 wherein said teeth have a substantially similar thickness.

10. A method for ensuring that attenuating blades of a collimator are substantially parallel using a combing tool having a plurality of substantially parallel teeth having cavities therebetween, said method comprising the step of inserting the combing tool teeth between adjacent attenuating blades.

11. A method in accordance with claim 10 wherein each of the cavities is configured to receive at least one attenuating blade.

12. A method in accordance with claim 11 further comprising the step of brushing the blades.

13. A method in accordance with claim 10 further comprising the step of brushing the blades.