Apparatus and method for analyzer-based contrast imaging with a polychromatic beam

Patent metadata

Field	Value
Publication number	US-11576636-B2
Application number	US-202016867662-A
Country	US
Kind code	B2
Filing date	May 6, 2020
Priority date	May 10, 2019
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A method and system for detecting an image of an object in an analyzer-based system with a polychromatic x-ray beam from an x-ray source, wherein an analyzer crystal and a detector simultaneously acquire a rocking curve of the x-ray beam for all energies of the x-ray beam. The x-ray beam is diffracted through the object using an asymmetrical monochromator. A detector movement is synchronized with one of the x-ray source or the object. The synchronization includes moving the detector at a first rate that is different than a second rate of the object or the x-ray source, wherein a ratio between the first rate and the second rate is determined by the magnification of the system.

First claim

What is claimed is:

1. A method for detecting an image of an object in an analyzer-based system with a polychromatic x-ray beam from an x-ray source, wherein an analyzer crystal and a detector simultaneously acquire a rocking curve of the x-ray beam for all energies of the x-ray beam, the method comprising:
diffracting the x-ray beam by an asymmetrical monochromator through the object; and
synchronizing a detector movement with one of the x-ray source or the object.

2. The method of claim 1 , further comprising moving the detector perpendicular to a longitudinal axis of the x-ray beam.

3. The method of claim 1 , wherein the x-ray source is positioned 2 meters or less from the object.

4. The method of claim 1 , wherein the synchronizing comprises the detector movement at a first rate that is different than a second rate of movement for the object or the x-ray source, and further comprising:
detecting more than one image of the object at the detector during the synchronizing; and
aligning the more than one image of the object as a function of a ratio of the first rate to the second rate.

5. A method for detecting an image of an object in an analyzer-based system with a polychromatic x-ray beam from an x-ray source, wherein an analyzer crystal and a detector simultaneously acquire a rocking curve of the x-ray beam for all energies of the x-ray beam, the method comprising synchronizing a detector movement with one of the x-ray source or the object, wherein the synchronizing comprises a detector movement at a first rate that is different than a second rate of the object or the x-ray source, wherein a ratio between the first rate and the second rate is determined by a magnification of the system.

6. The method of claim 5 , further comprising diffracting the x-ray beam by an asymmetrical monochromator through the object.

7. The method of claim 5 , wherein the synchronizing comprises moving the detector at a first rate that is faster than a second rate of the object or the x-ray source.

8. The method of claim 7 , further comprising aligning more than one image of the object at the detector as a function of a ratio of the first rate to the second rate.

9. The method of claim 7 , further comprising adjusting the first rate and/or second rate to improve a resolution of the image of the object.

10. The method of claim 7 , wherein a ratio of the first rate to the second rate is a function of a vertical magnification of the analyzer-based system.

11. The method of claim 10 , wherein the vertical magnification is a function of a crystal plane of a monochromator, a first distance between the x-ray source and a leading edge of the monochromator, a second distance extending from the leading edge to the object, and a third distance extending from the object to the detector.

12. A method for detecting an image of an object in an analyzer-based system, the method comprising:
generating a polychromatic x-ray beam from an x-ray source;
diffracting the x-ray beam by a monochromator;
transmitting the x-ray beam through the object and emitting from the object a transmitted beam;
directing the transmitted beam off a crystal analyzer to a detector;
synchronizing a movement of the object or the x-ray source with a detector movement during the transmitting, wherein the synchronizing comprises moving the detector at a first rate that is different than a second rate of the object or the x-ray source;
detecting more than one image of the object at the detector during the synchronizing;
aligning the more than one image of the object as a function of a ratio of the first rate to the second rate; and
combining the more than one image to derive the image of the object.

13. The method of claim 12 , wherein the x-ray source is positioned 2 meters or less from the object.

14. The method of claim 12 , further comprising adjusting the first rate and/or second rate to improve a resolution of the image of the object.

15. A method for detecting an image of an object in an analyzer-based system, the method comprising:
generating a polychromatic x-ray beam from an x-ray source;
diffracting the x-ray beam by a monochromator, wherein the monochromator comprises an asymmetric crystal;
transmitting the x-ray beam through the object and emitting from the object a transmitted beam;
directing the transmitted beam off a crystal analyzer to a detector;
synchronizing a movement of the object or the x-ray source with a detector movement during the transmitting;
detecting more than one image of the object at the detector during the synchronizing; and
combining the more than one image to derive the image of the object.

16. The method of claim 15 , further comprising moving the detector perpendicular to a longitudinal axis of the x-ray beam.

17. The method of claim 15 , wherein the synchronizing comprises moving the detector at a first rate that is different than a second rate of the object or the x-ray source.

18. A method for detecting an image of an object in an analyzer-based system, the method comprising:
generating a polychromatic x-ray beam from an x-ray source;
diffracting the x-ray beam by a monochromator;
transmitting the x-ray beam through the object and emitting from the object a transmitted beam;
directing the transmitted beam off a crystal analyzer to a detector;
synchronizing a movement of the object or the x-ray source with a detector movement during the transmitting, wherein the synchronizing comprises moving the detector at a first rate that is different than a second rate of the object or the x-ray source, and wherein a ratio of the first rate to the second rate is a function of a vertical magnification of the analyzer-based system;
detecting more than one image of the object at the detector during the synchronizing; and
combining the more than one image to derive the image of the object.

19. The method of claim 18 , wherein the vertical magnification is a function of a crystal plane of the monochromator, a first distance between the x-ray source and a leading edge of the monochromator, a second distance extending from the leading edge to the object, and a third distance extending from the object to the detector.

20. An analyzer-based imaging system, comprising:
a polychromatic x-ray source in combination with an asymmetrical monochromator;
an analyzer crystal in combination with a detector;
an object holder between the monochromator and the analyzer crystal; and
a controller configured to synchronize a detector movement with one of the x-ray source or the object holder.

21. The system of claim 20 , wherein the controller is configured to move the detector at a first rate that is different than a second rate of the object holder or the x-ray source.

Assignees

• Brankov Jovan G
• Caudevilla Torras Oriol
• Zhou Wei
• Illinois Institute Of Tech

Inventors

• Brankov Jovan G
• Caudevilla Torras Oriol
• Zhou Wei

Classifications

• A61B6/5205

  involving processing of raw data to produce diagnostic data · CPC title

• A61B6/502

  for diagnosis of breast, i.e. mammography · CPC title

• A61B6/463

  characterised by displaying multiple images or images and diagnostic data on one display · CPC title

• A61B6/484 Primary

  involving phase contrast X-ray imaging · CPC title

• A61B6/483

  involving scattered radiation · CPC title