SMALL DIAMETER X-RAY TUBE

• US 20110235778A1
• Filed: 03/29/2010
• Published: 09/29/2011
• Est. Priority Date: 03/29/2010
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Toh, Chin H., Bianchi, Maurice Peter
• Granted Patent: US 8,213,571 B2
• Time in Patent Office: Days
• US Class Current: 378/57
• CPC Class Codes: G01N 23/04 and forming images of the material
• CPC Class Codes: G21K 1/02 using diaphragms, collimators
• CPC Class Codes: G21K 1/067 using surface reflection, e.g. grazing incidence mirrors, gratings multilayer mirrors G21K1/062; crystal optics G21K1/06

Abstract

Methods and systems for X-ray imaging enable inspection of an area of an object that is located separate and apart from a location of an X-ray generator. An X-ray imaging system includes an X-ray generator to generate X-rays. A collimator filters the generated X-rays to consolidate the generated X-rays and move the generated X-rays in a direction parallel to a centerline axis of the collimator. A small diameter tube transmits the directed X-rays and an end retainer emits the transmitted X-rays at an inspection object. A first filter of the collimator may initially filter the generated X-rays that are not parallel to the centerline axis of the collimator by passing the X-rays through a plurality of apertures. A second filter of the collimator may consolidate the generated X-rays and move the generated X-rays in a direction parallel to the centerline axis of the collimator by passing the generated X-rays through a channel.

Claims

1. An X-ray imaging system, comprising:

an X-ray generator to generate X-rays;

a collimator to direct the X-rays into a direction of flow, a first end of the collimator operatively connected to the X-ray generator;

a small diameter tube operatively connected to a second end of the collimator opposite the X-ray generator, the small diameter tube to transmit the X-rays from the collimator along the direction of flow towards the inspection object; and

an end retainer coupled to an end of the small diameter tube opposite the X-ray generator, the end retainer to emit the X-rays to the area of inspection.

2. The X-ray imaging system of claim 1, wherein the collimator includes:

a first filter to filter the generated X-rays; and

a second filter to converge the generated X-rays.

3. The X-ray imaging system of claim 2, wherein the first filter and the second filter are formed of a lead, tungsten, or aluminum material.

4. The X-ray imaging system of claim 1, wherein the small diameter tube includes:

an X-ray transmission tube;

a cladding layer surrounding the X-ray transmission tube;

a metal layer surrounding the cladding layer;

a thermoplastic coating layer surrounding the metal layer; and

a cable jacket layer surrounding the thermoplastic coating layer.

5. The X-ray imaging system of claim 1, wherein the collimator includes a filter having a plurality of apertures to filter the generated X-rays.

6. The X-ray imaging system of claim 1, wherein the collimator includes a filter having a channel to consolidate the generated X-rays and moving the generated X-rays in a direction parallel to a centerline axis of the collimator.

7. The X-ray imaging system of claim 1, wherein the X-ray generator is separated from the end retainer by a distance of at least 10 feet.

8. The X-ray imaging system of claim 1, wherein the collimator shares a common centerline axis with the small diameter tube.

9. A method of inspecting an area of an object, the method comprising:

generating X-rays using an X-ray generator;

filtering the generated X-rays from the X-ray generator using a collimator to block unaligned X-ray beams and to allow aligned X-ray beams to pass through the collimator;

transmitting the aligned X-rays through a small diameter tube; and

emitting the aligned X-rays at the object.

10. The method of claim 9, wherein the collimator shares a common centerline axis with the small diameter tube.

11. The method of claim 9, wherein the X-ray generator is part of an X-ray backscatter imaging system.

12. The method of claim 9, wherein the filtering the generated X-rays includes:

passing the X-rays through a first filter having a plurality of apertures to filter out a portion of the X-rays that are not substantially parallel to a centerline axis of the collimator; and

passing the X-rays through a second filter having a channel to consolidate and move the X-rays in a direction parallel to the centerline axis of the collimator.

13. The method of claim 12, wherein the first filter and the second filter are formed of either a lead or tungsten material.

14. The method of claim 9, further comprising:

calculating a critical bend radius of the small diameter tube; and

adjusting the small diameter tube until all bend radii of the small diameter tube are more than the critical bend radius.

15. The method claim 9, wherein the small diameter tube includes:

an X-ray transmission tube at a core of the small diameter tube;

a cladding layer surrounding the X-ray transmission tube;

a metal layer surrounding the cladding layer;

a thermoplastic coating layer surrounding the metal layer; and

a cable jacket layer surrounding the thermoplastic coating layer.

16. A vehicle inspection system, comprising:

an X-ray generator to generate X-rays; and

a small diameter tube to transmit the X-rays, a first end of the small diameter tube connected to the X-ray generator and a second end of the small diameter tube to emit the X-rays at an object, the small diameter tube including;

a collimator proximate the first end of the small diameter tube, and

an end retainer proximate the second end of the small diameter tube, the collimator and the end retainer separated by a distance.

17. The vehicle inspection system of claim 16, wherein the collimator includes:

a first filter to filter the generated X-rays via a plurality of apertures; and

a second filter to converge the generated X-rays via a conical channel.

18. The vehicle inspection system of claim 17, wherein the first filter and the second filter are of either a lead or tungsten material.

19. The vehicle inspection system of claim 16, wherein the small diameter tube includes:

an X-ray transmission tube;

a cladding layer;

a metal layer;

a thermoplastic coating layer; and

a cable jacket layer.

20. The vehicle inspection system of claim 16, wherein the collimator shares a common centerline axis with the small diameter tube.