Apparatus and method for tracking feature's position in human body

• US 7,949,089 B2
• Filed: 04/07/2009
• Issued: 05/24/2011
• Est. Priority Date: 04/10/2008
• Status: Active Grant

• Current Assignee: Arineta Ltd.
• Original Assignee: Arineta Ltd.
• Inventors: Brada, Rafael Shmeul, Dafni, Ehud
• Primary Examiner(s): SONG, HOON K
• Application Number:
  US12/419,801
• Publication Number:
  US 20090257551A1
• Time in Patent Office: 777 Days
• Field of Search: 378 4- 20, 378/41
• US Class Current: 378/9
• CPC Class Codes: A61B 6/022 Stereoscopic imaging
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/4014 arranged in multiple source-detector units
• CPC Class Codes: A61B 6/4028 resulting in acquisition of views from substantially different positions, e.g. EBCT
• CPC Class Codes: A61B 6/481 involving the use of contrast agents
• CPC Class Codes: A61B 6/504 for diagnosis of blood vessels, e.g. by angiography
• CPC Class Codes: A61B 6/541 involving acquisition triggered by a physiological signal

Abstract

A CT scanner for scanning a subject is provided, the scanner comprising: a gantry capable of rotating about a scanned subject; at least two cone beam X-Ray sources displaced from each other mounted on said gantry; at least one 2D detector array mounted on said gantry, said detector is capable of receiving radiation emitted by said at least two X-Ray sources and attenuated by the subject to be scanned; a first image processor capable of generating and displaying CT images of a volume within the subject; a second image processor capable of generating projection X-Ray images of said volume, wherein the images are responsive to X-Ray separately emitted by each of said at least two cone beam X-Ray sources; and a third image processor capable of generating and displaying fluoroscopic images composed of said projection X-Ray images, wherein said fluoroscopic images are spatially registered to said CT images.

Claims

1. A CT scanner for scanning a subject comprising:

a gantry rotor configured to rotate about the subject;

at least two cone beam X-Ray sources displaced from each other mounted on said gantry rotor;

at least one 2D detector array mounted on said gantry rotor, said detector is operable to receive radiation emitted by said at least two cone beam X-Ray sources and attenuated by the subject;

a first image processor operable to generate CT images of a volume within the subject;

a second image processor operable to generate fluoroscopy images of said volume, wherein said fluoroscopy images are responsive to X-Rays separately emitted by each of said at least two cone beam X-Ray sources and wherein said fluoroscopy images are spatially registered to said CT images; and

a third image processor operable to display said fluoroscopy images responsive to X-Rays separately emitted by each of said at least two cone beam X-Ray sources and said CT images wherein the position of at least one feature within said volume may be visualized simultaneously in said fluoroscopy images and said CT images.

2. A CT scanner according to claim 1, wherein any of said first image processor, second image processor and third image processor are incorporated into a single image processor.

3. A CT scanner according to claim 1, wherein said at least two X-Ray sources are displaced from each other along a direction parallel to the rotation axis of said gantry.

4. A CT scanner according to claim 1, wherein said at least two X-Ray sources are displaced from each other azimuthally respective of the rotation axis of said gantry.

5. A CT scanner according to claim 1, wherein said at least two X-Ray sources comprise two X-Ray sources.

6. A CT scanner according to claim 1, wherein said fluoroscopic images are generated following injection of contrast agent.

7. A CT scanner according to claim 1, wherein said fluoroscopic images are generated and displayed in a sequence selected from a group comprising:

multiple times per second; and

one image at a time.

8. A CT scanner according to claim 1, wherein said fluoroscopic images are displayed overlaying an image derived from said CT images.

9. A CT scanner according to claim 1, wherein said fluoroscopic images are displayed side by side with said CT images.

10. A CT scanner according to claim 1, wherein a graphic mark indicating position of said at least one feature within said volume is overlaid said CT images.

11. A CT scanner according to claim 1, wherein said fluoroscopic images are used to position an interventional device respective of a lesion or specific anatomic structure.

12. A CT scanner according to claim 11, wherein said lesion or specific anatomic structure is identified using CT images.

13. A CT scanner according to claim 11, wherein the position of said interventional device respective said lesion or specific anatomic structure is verified using CT images, wherein the positioning process is guided by said fluoroscopic images.

14. A CT scanner according to claim 1, wherein said fluoroscopic images are visualized as stereoscopic images.

15. A CT scanner according to claim 14, wherein said stereoscopic images are visualized in a sequence selected from a group comprising:

multiple times per second; and

one image at a time.

16. A CT scanner according to claim 14, wherein said stereoscopic images are displayed overlaying CT images.

17. A CT scanner according to claim 14, wherein said stereoscopic images are displayed side by side with CT images.

18. A CT scanner according to claim 1, wherein a depth of said at least one feature is computed based on at least two fluoroscopic images acquired from different viewpoints respective the subject.

19. A CT scanner according to claim 1, wherein images are acquired responsive to at least one signal selected from a group comprising:

heart monitor signal; and

breathing monitor signal.

20. A CT scanner according to claim 1, wherein said multiple X-Ray sources comprise a single X-Ray tube housed within a single vacuum enclosure wherein said tube has multiple focal spots.

21. A CT scanner according to claim 1, wherein said multiple X-Ray sources comprise multiple X-Ray tubes.

22. A CT scanner according to claim 1, wherein the CT scanner comprises more than two sources wherein at least two sources are operative for generating stereoscopic images.

23. A CT scanner for scanning a subject comprising:

a gantry stator;

at least one gantry rotor, mounted on said gantry stator made to rotate about a subject;

a CT subsystem comprising;

at least one CT X-Ray source mounted on said at least one rotor;

at least one CT X-Ray detector array mounted on said at least one rotor;

wherein said at least one CT X-Ray source and said at least one X-Ray detector are configured to rotate together about the subject, and wherein said CT detector array is operable to receive radiation emitted by said CT X-Ray source and attenuated by the subject to be scanned; and

a first image processor operable to generate and display CT images of a volume within the subject; and

a fluoroscopy subsystem comprising;

at least one first and a second cone beam X-Ray sources displaced from each other mounted on said at least one rotor;

a 2D detector mounted on said at least one rotor, wherein said at least one first and a second cone beam X-Ray sources and said 2D detector array are configured to rotate together about the subject to be scanned, and wherein said 2D detector is capable of receiving radiation emitted by said at least one first and second X-Ray sources and attenuated by the subject to be scanned; and

a second image processor capable of generating projection X-Ray images of said volume, wherein the images are responsive to X-Ray separately emitted by each of said at least one first and second cone beam X-Ray sources; and

a third image processor capable of generating and displaying fluoroscopic images composed of said projection X-Ray images, wherein said fluoroscopic images are spatially registered to said CT images.

24. The CT scanner of claim 23, wherein said CT subsystem and said fluoroscopy subsystem are mounted on the same gantry rotor.

25. The CT scanner of claim 23, wherein said CT subsystem and said fluoroscopy subsystem are mounted substantially perpendicular to each other.

26. The CT scanner of claim 23, wherein said at least one gantry rotor comprises a first and a second gantry rotors configured to independently rotate about the subject, and wherein said CT subsystem is mounted to said first gantry rotor, and said fluoroscopy subsystem is mounted on said second gantry rotor, and wherein said first and second gantry rotors are mounted on said gantry stator.

27. A CT scanner according to claim 23, wherein said fluoroscopic images are visualized as stereoscopic images.

28. A CT scanner according to claim 23, wherein a graphic mark indicating position of a feature within said volume is overlaid said CT images wherein said position of the feature within said volume is computed responsive to the position of the feature in said projection X-Ray images.

29. A CT scanner for scanning a subject comprising:

a gantry rotor configured to rotate about the subject;

at least two cone beam X-Ray sources displaced from each other mounted on said gantry rotor;

at least one 2D detector array mounted on said gantry rotor, said detector is operable to receive radiation emitted by said at least two X-Ray sources and attenuated by the subject;

a first image processor operable to generate and display CT images of a volume within the subject;

a second image processor operable to generate and display fluoroscopy images of said volume, wherein said fluoroscopy images are responsive to X-Rays separately emitted by each of said at least two cone beam X-Ray sources and wherein said fluoroscopy images are spatially registered to said CT images; and

a third image processor operable to track the spatial position of at least one feature within said volume responsive to the position of the at least one feature in said fluoroscopy images.

30. A CT scanner according to claim 29, wherein any of said first image processor, second image processor and third image processor are incorporated into a single image processor.

31. A CT scanner according to claim 29, wherein said at least two X-Ray sources are displaced from each other along a direction parallel to the rotation axis of said gantry.

32. A CT scanner according to claim 29, wherein said at least two X-Ray sources are displaced from each other azimuthally respective of the rotation axis of said gantry.

33. A CT scanner according to claim 29, wherein said at least two X-Ray sources comprise two X-Ray sources.

34. A CT scanner according to claim 29, wherein said fluoroscopic images are generated following injection of contrast agent.

35. A CT scanner according to claim 29, wherein said fluoroscopic images are generated and displayed in a sequence selected from a group comprising:

multiple times per second; and

one image at a time.

36. A CT scanner according to claim 29, wherein said fluoroscopic images are displayed overlaying an image derived from said CT images.

37. A CT scanner according to claim 29, wherein said fluoroscopic images are displayed side by side with said CT images.

38. A CT scanner according to claim 29, wherein a graphic mark indicating position of said at least one feature within said volume is overlaid said CT images.

39. A CT scanner according to claim 29, wherein said fluoroscopic images are used to position an interventional device respective of a lesion or specific anatomic structure.

40. A CT scanner according to claim 29, wherein said fluoroscopic images are visualized as stereoscopic images.

41. A CT scanner according to claim 29, wherein tracking the spatial position of at least one feature comprise computation of the depth of said at least one feature in said volume based on at least two fluoroscopic images acquired from different viewpoints respective the subject.

42. A CT scanner according to claim 29, wherein images are acquired responsive to at least one signal selected from a group comprising:

heart monitor signal and/or breathing monitor signal.

43. A CT scanner according to claim 29, wherein the CT scanner comprises more than two sources wherein at least two sources are operative for generating stereoscopic images.

44. A CT scanner according to claim 30, wherein said stereoscopic images are visualized in a sequence selected from a group comprising:

multiple times per second; and

one image at a time.

45. A CT scanner according to claim 30, wherein said stereoscopic images are displayed overlaying CT images.

46. A CT scanner according to claim 30, wherein said stereoscopic images are displayed side by side with CT images.