Granted Patent B2

US 12,283,389 · App. 17/929,143 · Granted Apr 22, 2025

Inventors: Mark Procter (Wilmslow, GB); James Ollier (Huyton, GB); David Johnson (Stoke-onTrent, GB)

Assignee: Rapiscan Holdings, Inc.

G21K1/046G01V5/224G01V5/228

Abstract

Claims (30)

1. An adjustable collimator device adapted to collimate a beam of X-rays emitted from a radiation source, comprising:

an elongated body with a front-end and a rear-end;

a first plurality of emission apertures equally spaced around a longitudinal axis extending through a center of the elongated body, wherein the longitudinal axis defines a zero-degree position, wherein the first plurality of emission apertures is placed proximate the rear-end of the elongated body, and wherein the first plurality of emission apertures is configured to receive the beam of X-rays entering the adjustable collimator device; and

a second plurality of emission apertures placed proximate the front-end of the elongated body, wherein the second plurality of apertures are adjustable such that a first of the second plurality of apertures can be configured to have a first angular offset relative to the zero-axis and a second of the second plurality of apertures can be configured to have a second angular offset relative to the zero-axis, and wherein each of the second plurality of apertures is formed by two jaws having lengths which extend in the same direction as the beam of X-rays such that the beam of X-rays is collimated to yield a first beam of X-rays and a second beam of X-rays, separate from the first beam of X-rays but with substantially similar characteristics, that are concurrently emitted from the adjustable collimator device.

2. The adjustable collimator device of claim 1 , wherein the adjustable collimator device is configured to be rotated around a position of the radiation source by half of an angle of separation between the first beam of X-rays and the second beam of X-rays, to bring either one of the first beam of X-rays or the second beam of X-rays perpendicular to an object being imaged by the adjustable collimator device.

3. The adjustable collimator device according to claim 1 , wherein the first of the second plurality of apertures and the second of the second plurality of apertures are configured to be movable.

4. The adjustable collimator device according to claim 3 , wherein the two jaws of the first movable aperture are adjustable jaws that, in combination, define the first movable aperture and are configured to adjust the first movable aperture to a plurality of different angular offsets relative to the zero axis and wherein the two jaws of the second movable aperture are adjustable jaws that, in combination, define the second movable aperture and are configured to adjust the second movable aperture to a plurality of different angular offsets relative to the zero axis such that the first movable aperture and second movable aperture concurrently generate said first and second X-ray beams equally offset from the zero axis.

5. The adjustable collimator device according to claim 4 , wherein the two adjustable jaws of each of the first moveable aperture of the second plurality of apertures and second movable apertures of the second plurality of apertures are positioned such that the adjustable jaws do not occlude the beam of X-rays.

6. The adjustable collimator device according to claim 1 , wherein the first plurality of emission apertures comprises first and second fixed apertures.

7. The adjustable collimator device according to claim 1 , wherein said substantially similar characteristics of the first beam of X-rays and the second beam of X-rays comprise dose and energy.

8. The adjustable collimator device according to claim 1 , wherein the first angular offset is in a range of 5 degrees to 10 degrees.

9. The adjustable collimator device according to claim 1 , wherein the second angular offset is in a range of 5 degrees to 10 degrees.

10. A radiographic imaging method comprising:

positioning an adjustable collimator device near a radiation source configured to generate an X-ray beam, wherein the adjustable collimator device includes a first set of collimators and a second set of collimators, wherein the second set of collimators define a first aperture and a second aperture, wherein the first aperture is defined by first and second adjustable jaws and the second aperture is defined by third and fourth adjustable jaws and wherein each of the first, second, third, and fourth adjustable jaws have lengths which extend in the same direction as the beam of X-rays;

collimating the X-ray beam, using the first set of collimators, to concurrently generate a first X-ray beam and a second X-ray beam, wherein the first X-ray beam and the second X-ray beam are not parallel;

collimating the first X-ray beam, using a first of the second set of collimators, to generate a third X-ray beam, wherein the third X-ray beam emanates from the collimator device at a first angle of separation with respect to a central axis of the collimator device; and

collimating the second X-ray beam, using a second of the second set of collimators, to generate a fourth X-ray beam, wherein the fourth X-ray beam emanates from the collimator device at a second angle of separation with respect to the central axis.

11. The method of claim 10 , wherein the first angle of separation is equal to the second angle of separation.

12. The method of claim 10 , wherein the first set of collimators define first and second apertures of fixed width, and wherein the first and second apertures are positioned equidistant from the central axis.

13. The method of claim 10 , wherein widths of the first and second apertures of the second set of collimators are adjustable.

14. The method of claim 13 , wherein the first and second adjustable jaws are configured to adjust the first aperture to a plurality of different angular offsets relative to the central axis, and wherein the third and fourth adjustable jaws are configured to adjust the second aperture to a plurality of different angular offsets relative to the central axis.

15. The method of claim 14 , wherein the first and second adjustable jaws as well as the third and fourth adjustable jaws are positioned within the collimator device such that the first, second, third and fourth adjustable jaws do not occlude the first and second X-ray beams.

16. The method of claim 10 , wherein the third and fourth X-ray beams have substantially similar dose and energy characteristics.

17. The method of claim 10 , wherein the first angle of separation is in a range of 5 degrees to 10 degrees.

18. The method of claim 10 , wherein the second angle of separation is in a range of 5 degrees to 10 degrees.

19. The method of claim 10 , further comprising:

generating first scan data by detecting the third X-ray beam after the third X-ray beam passes through an object being scanned;

generating second scan data by detecting the fourth X-ray beam after the fourth X-ray beam passes through the object;

generating first and second image data by processing the first and second scan data, respectively; and

using the first and second image data, determining material composition and depth corresponding to contents of the object.

Assignments (2)

Continuity (2)

References Cited (400)