System and method for scanning an object in tomosynthesis applications

• US 6,901,132 B2
• Filed: 06/26/2003
• Issued: 05/31/2005
• Est. Priority Date: 06/26/2003
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Eberhard, Jeffrey, Al-Khalidy, Abdulrahman
• Primary Examiner(s): Bruce, David V
• Application Number:
  US10/607,317
• Publication Number:
  US 20040264635A1
• Time in Patent Office: 705 Days
• Field of Search: 378/4, 378/8, 378/15, 378/19, 378/21, 378/22, 378/23
• US Class Current: 378/23
• CPC Class Codes: A61B 6/025 Tomosynthesis
• CPC Class Codes: A61B 6/027 characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
• CPC Class Codes: G01N 2223/419 computed tomograph
• CPC Class Codes: G01N 2223/612 biological material
• CPC Class Codes: G01N 23/044 using laminography or tomosynthesis
• CPC Class Codes: G01N 23/046 using tomography, e.g. computed tomography [CT]

Abstract

A tomosynthesis system for scanning a region in an object comprises a radiation source configured to traverse in a plurality of positions yielding a plurality of scanning directions. Each of the plurality of positions corresponds to a respective scanning direction. Further, the plurality of scanning directions comprise at least a scanning direction along a first axis and a direction along a second axis, the second axis being transverse to the first axis.

Claims

1. A tomosynthesis system for scanning a region in an object, the system comprising:

a radiation source configured to traverse in a plurality of positions yielding a plurality of scanning directions, wherein each of the plurality of positions corresponds to a respective scanning direction, and wherein the plurality of scanning directions comprise at least a scanning direction along a first axis and a direction along a second axis, wherein the second axis is transverse to the first axis.

2. The system of claim 1, wherein the radiation source projects a radiation beam which impinges the object.

3. The system of claim 1, wherein the radiation source is configured to traverse in the plurality of positions at a predetermined distance above the object.

4. The system of claim 1, further comprising a detector configured to acquire a plurality of projection images of the region in the object from the radiation beam attenuated by the object, wherein the detector is disposed in a spaced apart relationship with respect to the source and at a predetermined distance from the object.

5. The system of claim 3, wherein at least one of the plurality of positions is defined by an edge of the detector in the direction along the first axis.

6. The system of claim 3, wherein at least two of the plurality of positions are defined by two edges of the detector.

7. The system of claim 3, wherein the region in the object extends beyond the detector.

8. The system of claim 3, wherein the plurality of scanning directions comprise covering a plurality of areas defined respectively by a plurality of predetermined dimensions of the detector, wherein the plurality of the predetermined dimensions comprises at least a height and a width of the detector.

9. The system of claim 8, wherein the plurality of areas comprise at least an area defined by the height and the width of the detector.

10. The system of claim 8, wherein the plurality of areas comprise at least an area defined by the width of the detector and a fraction of the height of the detector.

11. The system of claim 8, wherein the plurality of areas comprise at least an area defined by the height of the detector and a fraction of the width of the detector.

12. The system of claim 8, wherein the plurality of areas comprise at least an area defined by the width of the detector and a multiple of the height of the detector.

13. The system of claim 8, wherein the plurality of areas comprise at least an area defined by the height of the detector and a multiple of the width of the detector.

14. The system of claim 8, wherein the plurality of areas comprise at least an area defined by a portion of the width and a portion of the height of the detector.

15. The system of claim 3, wherein the detector is configured to acquire the plurality of projection images at a plurality of predetermined acquisition points at the detector.

16. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least two points at two opposite corners of the detector.

17. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least two points at two opposite corners of the detector and a point at the center of the detector.

18. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least four points at four corners of the detector.

19. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least four points at four corners of the detector and a point at the center of the detector.

20. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least center points of a each edge of the detector and a point at the center of the detector.

21. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least center points of a each edge of the detector.

22. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least more than four points along a border of the detector.

23. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least points at a varying distance defined by the center of the detector and an edge of the detector.

24. The system of claim 15, wherein the plurality of predetermined acquisition points comprise at least a plurality of points outside the detector, wherein the plurality of points outside the detector correspond to the radiation source positions during the scanning direction along the second axis.

25. The system of claim 3, wherein the detector is configured to traverse in a plurality of directions, each of the plurality of the directions corresponding respectively to each of the plurality of positions of the radiation source.

26. A tomosynthesis system for scanning a region in an object, the system comprising:

a radiation source configured to traverse in a plurality of positions yielding a plurality of scanning directions, each of the plurality of positions corresponding to a respective scanning direction, wherein the plurality of scanning directions comprise at least a scanning direction along a first axis and a direction along a second axis, wherein the second axis is transverse to the first axis, and wherein the source projects a radiation beam which impinges the object; and

a detector configured to acquire a plurality of projection images of the region in the object from the radiation beam attenuated by the object, wherein said detector is disposed at a predetermined distance from the object, wherein at least one of the plurality of positions is defined by an edge of the detector in the direction along the first axis.

27. The system of claim 26, wherein at least two of the plurality of positions are defined by two edges of the detector.

28. The system of claim 26, wherein the region in the object extends beyond the detector.

29. The system of claim 26, wherein the plurality of scanning directions comprise covering a plurality of areas defined respectively by a plurality of predetermined dimensions of the detector, wherein the plurality of the predetermined dimensions comprises at least a height and a width of the detector.

30. The system of claim 26, wherein the detector is configured to acquire the plurality of projection images at a plurality of predetermined acquisition points at the detector.

31. The system of claim 26, wherein the detector is configured to traverse in a plurality of directions, each of the plurality of the directions corresponding respectively to each of the plurality of positions of the radiation source.

32. A tomosynthesis system for scanning a region in a object, the system comprising:

a radiation source configured to traverse in a plurality of positions yielding a plurality of scanning directions, each of the plurality of positions corresponding to a respective scanning direction, wherein the plurality of scanning directions comprise at least a scanning direction along a first axis and a direction along a second axis, wherein the second axis is transverse to the first axis, and wherein the radiation source projects a radiation beam which impinges the object; and

a detector configured to acquire a plurality of projection images of the region in the object from the radiation beam attenuated by the object, wherein said detector is disposed at a predetermined distance from the object, and wherein the detector is configured to traverse in a plurality of directions, each of the plurality of the directions corresponding respectively to each of the plurality of positions of the source.

33. The system of claim 32, wherein at least one of the plurality of positions is defined by an edge of the detector in the direction along the first axis.

34. The system of claim 32, wherein at least two of the plurality of positions are defined by two edges of the detector.

35. The system of claim 32, wherein the region in the object extends beyond the detector.

36. The system of claim 32, wherein the plurality of scanning directions comprise covering a plurality of areas defined respectively by a plurality of predetermined dimensions of the detector, wherein the plurality of the predetermined dimensions comprises at least a height and a width of the detector.

37. The system of claim 32, wherein the detector is configured to acquire the plurality of projection images at a plurality of predetermined acquisition points at the detector.

38. A tomosynthesis system for scanning a region in a object, the system comprising:

a radiation source configured to traverse in a plurality of positions yielding a plurality of scanning directions, each of the plurality of positions corresponding to a respective scanning direction, wherein the plurality of scanning directions comprise at least a scanning direction along a first axis and a direction along a second axis, wherein the second axis is transverse to the first axis, and wherein the source projects a radiation beam which impinges the object;

a system controller operably coupled to the source;

a detector configured to acquire a plurality of projection images of the region in the object from the radiation beam attenuated by the object, wherein said detector is disposed at a predetermined distance from the object;

a motor controller configured to displace at least one of the source, and the detector;

a data acquisition system operably coupled to the detector configured to receive the plurality of projection images and to form one or more reconstructed slices representative of the region being imaged; and

an operator workstation operably coupled to the processing circuit configured to display the one or more reconstructed slices.

39. The system of claim 38, wherein at least one of the plurality of positions is defined by an edge of the detector in the direction along the first axis.

40. The system of claim 38, wherein at least two of the plurality of positions are defined by two edges of the detector.

41. The system of claim 38, wherein the region in the object extends beyond the detector.

42. The system of claim 38, wherein the plurality of scanning directions comprise covering a plurality of areas defined respectively by a plurality of predetermined dimensions of the detector, wherein the plurality of the predetermined dimensions comprises at least a height and a width of the detector.

43. The system of claim 38, wherein the detector is configured to acquire the plurality of projection images at a plurality of predetermined acquisition points at the detector.

44. The system of claim 38, wherein the detector is configured to traverse in a plurality of directions, each of the plurality of the directions corresponding respectively to each of the plurality of positions of the radiation source.

45. A method for scanning a region in an object using a tomosynthesis system, the method comprising:

scanning the region in the object along a first axis and along a second axis, wherein the second axis is transverse to the first axis, and wherein the scanning comprises traversing a radiation source in a plurality of positions, each of the plurality of positions corresponding to a respective scanning direction; and

acquiring a plurality of projection images of the region in the object by using a detector disposed at a predetermined distance from the object.

46. The method of claim 45, wherein at least one of the plurality of positions is defined by an edge of the detector in the direction along the first axis.

47. The method of claim 45, wherein at least two of the plurality of positions are defined by two edges of the detector.

48. The method of claim 45, wherein scanning in the plurality of directions comprises covering a plurality of areas defined respectively by a plurality of predetermined dimensions of the detector, wherein the plurality of the predetermined dimensions comprises at least a height and a width of the detector.

49. A method for scanning a region in an object using a tomosynthesis system, the method comprising:

scanning the region in the object along a first axis and along a second axis, wherein the second axis is transverse to the first axis, and wherein the scanning comprises traversing a radiation source in a plurality of positions, each of the plurality of positions corresponding to a respective scanning direction; and

acquiring a plurality of projection images of the region in the object by using a detector disposed at a predetermined distance from the object, wherein at least one of the plurality of positions is defined by an edge of the detector in the direction along the first axis.

50. The method of claim 49, wherein at least two of the plurality of positions are defined by two edges of the detector.

51. The method of claim 49, wherein scanning in the plurality of directions comprises covering a plurality of areas defined respectively by a plurality of predetermined dimensions of the detector, wherein the plurality of the predetermined dimensions comprises at least a height and a width of the detector.