Methods and systems for rapid detection of concealed objects using fluorescence

• US 7,366,282 B2
• Filed: 10/15/2005
• Issued: 04/29/2008
• Est. Priority Date: 09/15/2003
• Status: Expired due to Term

• Current Assignee: Rapiscan Systems Incorporated (OSI Systems Incorporated)
• Original Assignee: Rapiscan Security Products USA Incorporated (OSI Systems Incorporated)
• Inventors: Peschmann, Kristian R.
• Primary Examiner(s): Yun; Jurie
• Application Number:
  US11/251,601
• Publication Number:
  US 20060098773A1
• Time in Patent Office: 927 Days
• Field of Search: 378/57, 378/58, 378 70- 90, 378 44- 46
• US Class Current: 378/57
• CPC Class Codes: G01N 23/04 and forming images of the material

Abstract

This invention is directed towards finding, locating, and confirming threat items and substances. The inspection system is designed to detect objects that are made from, but not limited to, special nuclear materials (“SNM”) and/or high atomic number materials. The system employs advanced image processing techniques to analyze images of an object under inspection (“OUI”), which includes, but is not limited to baggage, parcels, vehicles and cargo, and fluorescence detection.

Claims

1. An apparatus for identifying an object concealed within a container, comprising:

a first stage inspection system having a scanning system to generate a first set of data;

a plurality of processors in data communication with the first stage inspection system wherein the processors process said first set of data and wherein the first set of data is used to identify at least one target region;

a means for positioning an inspection region relative to the target region wherein an inspection region at least partially physically coincides with the target region; and

a second stage inspection system for generating the inspection region wherein the second stage inspection system comprises a first member having detector electronics and a diffraction detector head;

a second member affixed substantially perpendicular to the first member;

a third member affixed substantially perpendicular to the second member and parallel to the first member, wherein the third member comprises a radiation source for projecting an X-ray beam toward the target object and comprises a fluorescence detector head in an angular relationship to said radiation source; and

a conveyor for positioning said target object between said first member having detector electronics and a diffraction detector head and said third member having said radiation source and said fluorescence detector head;

wherein the second stage inspection system produces a second set of data having an X-ray signature characteristic of the material in said inspection region and a third set of data having a fluorescence signature characteristic of the material in said inspection region; and

a processor that outputs a ratio of an attenuation caused by said material to a size of said material, based upon said second set of data having an X-ray signature characteristic and said third set of data having a fluorescence signature characteristic, and, using said ratio, outputs a determination of whether the material is a nuclear material.

2. The apparatus of claim 1 wherein the second stage inspection system is a C-shaped inspection system.

3. The apparatus of claim 1 further comprising a bypass conveyor capable of moving said object into a secured area without first passing through said second stage inspection system.

4. The apparatus of claim 1 wherein an operator selects the target region based upon an X-ray characteristic.

5. The apparatus of claim 4 wherein the X-ray characteristic is at least one of mass, degree of attenuation, area, atomic number, size, shape, pattern, or context.

6. The apparatus of claim 1 wherein the target region is identified by having a processor execute an algorithm to select the region based upon said first set of data.

7. The apparatus of claim 1 wherein a plurality of X-ray beam projections intersects the target region at an intersection area, said target region having a location.

8. The apparatus of claim 7 wherein the location of the target region is determined by identifying a set of coordinates for the intersection area.

9. The apparatus of claim 8 wherein a plurality of control commands is produced in response to the determination of said location of the target region.

10. The apparatus of claim 9 wherein the inspection region is positioned relative to the target region in response to the plurality of control commands using a three-axis control system.

11. The apparatus of claim 1 wherein the means for positioning said inspection region relative to the target region includes a plurality of adjustable apertures.

12. The apparatus of claim 11 wherein the apertures can be physically moved in the direction of the main beam axis.

13. The apparatus of claim 12 wherein at least one of said plurality of adjustable apertures is a ring aperture having an adjustable diameter.

14. The apparatus of claim 1 wherein the means for positioning said inspection region relative to the target region comprises a conveyor operable to move in elevation relative to the second stage inspection system.

15. The apparatus of claim 1 wherein the means for positioning said inspection region relative to the target region comprises an aperture and ring aperture.

16. The apparatus of claim 1 wherein the second stage inspection system comprises an inspection region generation system.

17. The apparatus of claim 16 wherein the inspection region generation system comprises a source of X-ray radiation.

18. The apparatus of claim 17 wherein the inspection region generation system comprises an energy dispersive detector.

19. The apparatus of claim 18 wherein the energy dispersive detector is used to produce a signature of the material in the inspection region.

20. The apparatus of claim 17 wherein the inspection region generation system comprises a fluorescence detector.

21. The apparatus of claim 20 wherein the fluorescence detector is used to produce a signature of the material in the inspection region.

22. The apparatus of claim 1 wherein said first set of data is used to identify a reference spectrum.

23. The apparatus of claim 22 wherein said identification of a reference spectrum is achieved by identifying a spectrum associated with said first set of data.

24. The apparatus of claim 23 wherein the reference spectrum is used to correct a diffraction spectrum.

25. The apparatus of claim 23 wherein the reference spectrum is used to correct for beam hardening.

26. The apparatus of claim 1 wherein the X-ray signature characteristic is a diffraction pattern.

27. The apparatus of claim 1 wherein the X-ray signature characteristic is a scatter spectrum.

28. A device for inspecting high atomic number material located within a target object using a radiation source, comprising:

a first member having detector electronics and a diffraction detector head;

a second member affixed substantially perpendicular to the first member;

a third member affixed substantially perpendicular to the second member and parallel to the first member, wherein the third member comprises a radiation source for projecting an X-ray beam toward the target object and comprises a fluorescence detector head in an angular relationship to said radiation source;

a conveyor for positioning said target object between said first member having detector electronics and a diffraction detector head and said third member having said radiation source and said fluorescence detector head

wherein the device produces a first set of data having an X-ray signature characteristic of the material in an inspection region and a second set of data having a fluorescence signature characteristic of the material in said inspection region; and

a processor that outputs a ratio of an attenuation caused by said material to a size of said material, based upon said first set of data having an X-ray signature characteristic and said second set of data having a fluorescence signature characteristic, and, using said ratio, outputs a determination of whether the material is a nuclear material.

29. The device of claim 28 further comprising:

at least one processor and display for generating an image of said target object;

a memory; and

a plurality of instructions stored within said memory wherein said instructions, when executed by said processor, analyze the image using an algorithm to evaluate regions of objects based upon a threshold level, segment said image into regions based upon criteria, direct the device to further inspect selected regions satisfying certain criteria to determine their size and shape, compare said selected regions to threat criteria, and issue an alarm to an inspector when an object is determined as matching said threat criteria in said comparing step.