Radiography by selective detection of scatter field velocity components

• US 7,224,772 B2
• Filed: 07/20/2004
• Issued: 05/29/2007
• Est. Priority Date: 07/20/2004
• Status: Active Grant

• Current Assignee: University of Florida Research Foundation, Incorporated (State University System of Florida)
• Original Assignee: University of Florida Research Foundation, Incorporated (State University System of Florida)
• Inventors: Jacobs, Alan M., Dugan, Edward T., Shedlock, Daniel
• Primary Examiner(s): Glick; Edward J.
• Assistant Examiner(s): Kiknadze; Irakli
• Application Number:
  US10/896,243
• Publication Number:
  US 20060018434A1
• Time in Patent Office: 1,043 Days
• Field of Search: 378/6, 378/45, 378/70, 378/86, 378/87, 378/98.8, 378/98.9, 378/146, 378147-158, 250/370.09, 250/505.1, 250/397
• US Class Current: 378/150
• CPC Class Codes: G01N 23/20 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
• CPC Class Codes: G21K 1/04 using variable diaphragms, shutters, choppers

Abstract

A reconfigurable collimated radiation detector, system and related method includes at least one collimated radiation detector. The detector has an adjustable collimator assembly including at least one feature, such as a fin, optically coupled thereto. Adjustments to the adjustable collimator selects particular directions of travel of scattered radiation emitted from an irradiated object which reach the detector. The collimated detector is preferably a collimated detector array, where the collimators are independently adjustable. The independent motion capability provides the capability to focus the image by selection of the desired scatter field components. When an array of reconfigurable collimated detectors is provided, separate image data can be obtained from each of the detectors and the respective images cross-correlated and combined to form an enhanced image.

Claims

1. A backscatter radiography system, comprising:

a source of a penetrating radiation beam for irradiating first area of an object to a depth to be interrogated, wherein responsive to said irradiating said object emits backscattered radiation comprising a first backscatter component and plurality of multiple backscatter components, said multiple backscatter components emerging from said object from areas remote from said first area due to lateral migration, and

an array of reconfigurable collimated radiation detectors disposed on the same side of said object as said source of penetrating radiation, a center of at least one of said detectors laterally offset from a line between said radiation beam and said first area of said object, said detectors having adjustable collimators, said collimators comprising;

a concave structure including a plurality of spaced apart features secured thereto, said detector disposed inside said concave structure, and a capping structure, wherein said capping structure is slideably mounted to said concave structure, wherein said collimators select a field-of-view for said backscattered radiation which is less than an entire volume of said object which scatters said beam, but more than a volume which intersects the radiation beam at said first area, and wherein adjustments to said collimators selects particular sets of directions of travel of said multiple backscatter components which reach said detector.

2. The system of claim 1, wherein said, source of penetrating radiation comprises an x-ray, a gamma ray, neutron or an electron beam source.

3. The system of claim 1, wherein said source of penetrating radiation includes a modulator, said modulator modulating the energy of said penetrating radiation.

4. The system of claim 1, wherein at least one collimated detector in said array detects both selected first scatter photons and selected multiple scatter photons.

5. The system of claim 1, wherein said detectors in said detector array are independently adjustable.

6. A method of selective backscatter radiographic imaging, comprising the steps of:

providing an array of collimated radiation detectors having adjustable collimators;

irradiate with a beam of a penetrating radiation a first area of an object to a depth to be interrogated, wherein responsive to said irradiating said object emits backscattered radiation comprising a first backscatter component and plurality of multiple backscatter components, said multiple backscatter components emerging from said object from areas remote from said first area due to lateral migration;

receiving said backscattered radiation, wherein said collimated detectors provide a field-of-view which is less than an entire volume of said object which scatters said beam, but more than a volume which intersects said radiation beam at said first area;

wherein selectively detected portions comprising particular sets of directions of travel of said first scatter and said multiple scatter components reach said detectors, and

forming an image from said selectively detected portions.

7. The method of claim 6, further comprising the step of adjusting at least one of said collimators and then repeating said irradiating, said receiving and said forming steps, wherein said adjusting step comprises independently adjusting said collimated detectors in said array.

8. The method of claim 7, wherein said independent adjusting occurs during said receiving step.

9. The method of claim 7, wherein said adjustment is automatic based on feedback of signal-to-noise information.

10. The method of claim 6, further comprising the step of processing said image, wherein said processing comprises using pattern recognition or neural networks.

11. The method of claim 6, wherein an energy of said penetrating radiation beam is varied during said method.

12. The method of claim 11, wherein said image is a 3D imaging.

13. The method of claim 6, further comprising the step of scanning said object relative to said penetrating radiation beam.