Contrast-enhanced cone beam X-ray imaging, evaluation, monitoring and treatment delivery

• US 7,394,889 B2
• Filed: 05/18/2006
• Issued: 07/01/2008
• Est. Priority Date: 05/18/2006
• Status: Active Grant

• Current Assignee: Varian Medical Systems Incorporated (Siemens AG), Regents of the University of California (University of California)
• Original Assignee: Varian Medical Systems Incorporated (Siemens AG)
• Inventors: Humber, David, Partain, Larry D., Boone, John, Prionas, Stavros, Sutherland, Robert, Mostafavi, Hassan, Seppi, Edward, Fernando, Felix
• Primary Examiner(s): Yun; Jurie
• Application Number:
  US11/437,076
• Publication Number:
  US 20070269000A1
• Time in Patent Office: 775 Days
• Field of Search: 378 4- 27, 378/37, 378/65, 378/68
• US Class Current: 378/37
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/4085 Cone-beams
• CPC Class Codes: A61B 6/4241 using energy resolving detectors, e.g. photon counting
• CPC Class Codes: A61B 6/482 involving multiple energy imaging
• CPC Class Codes: A61B 6/502 for diagnosis of breast, i.e. mammography
• CPC Class Codes: A61B 6/507 for determination of haemodynamic parameters, e.g. perfusion CT

Abstract

A method of imaging a patient'"'"'s uncompressed region of interest using X-ray cone beam computed tomography or cone beam digital tomography comprises the step of introducing an effective amount of a contrast agent to the uncompressed region of interest. A system for imaging a patient'"'"'s uncompressed region of interest using cone beam computed tomography (CBCT) or cone beam digital tomography (CBDT) comprises an X-ray source transmitting an X-ray to the uncompressed region of interest, an image acquisition system acquiring a plurality of two-dimensional projection images data for a CBCT or CBDT data set with at least one of the projection images acquired in 35 milliseconds or less, and a processor generating a three-dimensional computed tomography image data set resolving voxels with dimensions of 0.4 mm or less in at least two orthogonal directions.

Claims

1. A method of imaging a patient'"'"'s uncompressed region of interest using X-ray cone beam computed tomography or cone beam digital tomography comprising the steps of introducing an effective amount of a contrast agent to the uncompressed region of interest, and acquiring a plurality of projection images for a tomography data set of the uncompressed region of interest according to the following equation:

Δ

t≦

Δ

x/v

where v represents a velocity that the uncompressed region of interest moves during the acquisition, Δ

x represents a spatial resolution of the tomography data set, and Δ

t represents a time interval acquiring the tomography data set.

2. The method of claim 1 wherein the region of interest is a patient'"'"'s uncompressed breast.

3. The method of claim 1 in which one or more of the projection images are acquired in 5 seconds or less.

4. The method of claim 3 in which one or more of the projection images are acquired in 35 milliseconds or less.

5. The method of claim 4 in which one or more of the projection images are acquired in 0.1 milliseconds or less.

6. The method of claim 1 in which the data set is acquired with a spatial resolution resolving voxels with dimensions of 10 mm or less in at least two orthogonal directions.

7. The method of claim 6 in which the data set is acquired with a spatial resolution resolving voxels with dimensions of 0.4 mm or less in at least two orthogonal directions.

8. The method of claim 7 in which the data set is acquired with a spatial resolution resolving voxels with dimensions of 5 μ

m or less in at least two orthogonal directions.

9. The method of claim 1 in which at least one of the projection images is acquired in 35 milliseconds or less with a spatial resolution resolving voxels with dimensions of 0.4 mm or less in at least two orthogonal directions.

10. The method of claim 1 wherein the contrast agent is iodine-based.

11. The method of claim 1 wherein the introducing step includes delivering to the uncompressed region of interest a cone beam X-ray with a dose ranging from 2 to 50 milligray.

12. The method of claim 1 in which the acquiring step is carried out using a two dimensional flat panel imager operating at 1 frame per second or higher.

13. The method of claim 1 in which the acquiring step is carried out using a two dimensional flat panel imager operating at 10 frames per second or higher.

14. The method of claim 1 in which the acquiring step is carried out using a two dimensional flat panel imager operating at 1000 frames per second or higher.

15. The method of claim 1 further comprising the step of administering a therapeutic substance and/or carrying out a therapeutic procedure to the patient prior to the step of acquiring projection images.

16. The method of claim 15 further comprising the step of repeating the acquiring step over time to provide a representation of time dependence of response of the patient'"'"'s region of interest to the therapeutic substance or procedure.

17. The method of claim 15 wherein the therapeutic substance and/or therapeutic procedure inhibit the development of angiogenesis.

18. The method of claim 1 which is adapted to image an uncompressed region of interest that moves at a velocity of about 0.2 mm/second during the acquisition.

19. The method of claim 1 which is adapted to image an uncompressed region of interest that moves at a velocity of about 2.0 mm/second during the acquisition.

20. The method of claim 1 which is adapted to image an uncompressed region of interest that moves at a velocity of about 20 mm/second during the acquisition.

21. The method of claim 1 wherein the tomography data set is a gated data set.

22. A method of imaging a patient'"'"'s uncompressed region of interest using X-ray cone beam computed tomography (CBCT) or cone beam digital tomography (CBDT) comprising the step of acquiring a plurality of two-dimensional projection images for a CBCT or CBDT data set at a rate of at least 1000 images per second, in which the CBCT or CBDT data set is acquired according to the following equation:

Δ

t≦

Δ

x/v

where v represents a velocity that the uncompressed region of interest moves during the acquisition, Δ

x represents a spatial resolution of the tomography data set, and Δ

t represents a time interval acquiring the tomography data set.

23. A method of imaging a patient'"'"'s uncompressed region of interest using X-ray cone beam computed tomography (CBCT) or cone beam digital tomography (CBDT) comprising the step of generating a three-dimensional computed tomography image data set of the uncompressed region of interest resolving voxels with dimensions of 0.4 mm or less in at least two orthogonal directions, according to the following equation:

Δ

t≦

Δ

x/v

where Δ

t represents a time interval acquiring the tomography data set, and v represents a velocity that the uncompressed region of interest moves during the acquisition.

24. The method of claim 23 further comprising the step of introducing an effective amount of a contrast agent into the uncompressed region of interest.

25. The method of claim 23 wherein the tomography data set is a gated data set.

26. A method of delivering X-ray treatment dose distribution to a patient'"'"'s uncompressed region of interest using X-ray cone beam computed tomography or cone beam digital tomography, comprising the steps of introducing an effective amount of a contrast agent to the uncompressed region of interest, acquiring a plurality of two-dimensional projection images for a cone beam tomography data set and delivering an X-ray treatment dose distribution ranging from 1 to 7000 centigray to the uncompressed region of interest,

in which the tomography data set is acquired according to the following equation:

Δ

t≦

Δ

x/v

where v represents a velocity that the uncompressed region of interest moves during the aquisition, Δ

x represents a spatial resolution of the tomography data set, and Δ

t represents a time interval acquiring the tomography data set.

27. The method of claim 26 in which the tomography data set is acquired with an X-ray dose ranging from 2 to 50 milligray followed by the delivery of the X-ray treatment dose distribution.

28. The method of claim 26 further comprising the step of generating a 3-dimensional tomography data set prior to delivering the X-ray treatment dose distribution to the uncompressed region of interest.

29. The method of claim 26 further comprising the step of generating a 3-dimensional tomography data during the process of delivering the X-ray treatment dose distribution to the uncompressed region of interest.

30. The method of claim 26 wherein the tomography data set is a gated data set.