Three-dimensional surface image guided adaptive therapy system

• US 20050096515A1
• Filed: 10/25/2004
• Published: 05/05/2005
• Est. Priority Date: 10/23/2003
• Status: Abandoned Application

• Current Assignee: Technest Holdings, Inc. (AccelPath, Inc.)
• Original Assignee: Technest Holdings, Inc. (AccelPath, Inc.)
• Inventors: Geng, Z. Jason
• Application Number:
  US10/973,579
• Publication Number:
  US 20050096515A1
• Time in Patent Office: Days
• US Class Current: 600/315
• CPC Class Codes: A61N 2005/1059 using cameras imaging the patient
• CPC Class Codes: A61N 2005/1076 using a dummy object placed in the radiation field, e.g. phantom
• CPC Class Codes: A61N 5/1049 for verifying the position of the patient with respect to the radiation beam
• CPC Class Codes: A61N 5/107 in real time, i.e. during treatment
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 2207/10081 Computed x-ray tomography [CT]
• CPC Class Codes: G06T 2207/20016 Hierarchical, coarse-to-fine, multiscale or multiresolution image processing; Pyramid transform
• CPC Class Codes: G06T 2207/30016 Brain
• CPC Class Codes: G06T 2207/30068 Mammography; Breast
• CPC Class Codes: G06T 7/33 using feature-based methods

Abstract

A patient surface image guided therapy process includes the steps of acquiring a three-dimensional reference image of an area to be treated, acquiring a three-dimensional treatment image of the area to be treated; matching the reference image to the treatment image; and calculating any differences between the reference image and the treatment images to generate patient repositioning parameters.

Claims

1. A patient surface image guided therapy process comprising the steps of:

acquiring a three-dimensional reference image of an area to be treated,

acquiring a three-dimensional treatment image of said area to be treated;

matching said reference image to said treatment image; and

calculating any differences between said reference image and said treatment images to generate patient repositioning parameters.

2. The method of claim 1, and further comprising adjusting patient positioning or treatment machine configuration to achieve correct patient positioning.

3. The process of claim 1, wherein the step of capturing comprises the step of positioning a 3D Rainbow Camera above the treatment machine.

4. The process of claim 1, wherein the step of capturing comprises the step of operating a Rainbow 3D Camera for projecting a rainbow light pattern having a known spatially distributed structured light across the entire scene simultaneously.

5. The process of claim 1 wherein the step of preparing a pre-treatment CT scan further includes the additional step of calibrating the 3D Camera with the CT isocenter for identifying the relationship between the surface images and any internal structure or tumor.

6. The process of claim 1, including the additional step of modeling the inter-relationship between different types of tissue by applying displacement forces.

7. The process of claim 1, and further comprising an iterative fine alignment optimization process that includes searching for closest corresponding points between two images, optimizing via parameter perturbation, and determining whether a difference between a location of said positions is below a predetermined threshold.

8. The process of claim 1, wherein acquiring said three-dimensional reference image of said area to be treated comprises acquiring an image of a head and neck area.

9. The process of claim 1, wherein matching said reference image to said treatment image comprises selecting salient features.

10. The process of claim 9, wherein selecting said salient features comprises receiving an operator selection of said salient features.

11. The process of claim 10, wherein receiving said operator selection comprises processing a mouse click.

12. The process of claim 9, and further comprising performing an iterative fine alignment optimization process.

13. The process of claim 12, and further comprising performing an iterative closest point algorithm.

14. The process of claim 1, wherein acquiring said reference scan comprises acquiring a three-dimensional surface image.

15. The process of claim 1, wherein acquiring said reference scan comprises acquiring a CT scan, acquiring a three-dimensional surface image, and matching said CT scan to said three-dimensional surface image.

16. The method of claim 1, and further comprising performing deformable modeling operation on said area of interest.

17. The method of claim 16, wherein performing said deformable modeling operation includes using volumetric information from said reference image to generate a finite element model.

18. The method of claim 17, wherein generating said finite element model includes a plurality of layers having different material properties.

19. The method of claim 18, wherein thicknesses of said material properties are estimated using said reference image.

20. The method of claim 19, and further comprising matching surface boundary conditions of said reference image and said treatment image and estimating material properties of said area of interest based on said finite element model.

22. The system of claim 16, wherein said three-dimensional camera includes light projector configured to project light of spatially varying wavelengths.

23. The system of claim 22, wherein said light projector comprises an array of digital micro-mirror devices.

21. A system for surface image guided therapy, comprising:

a three-dimensional camera coupled to a processor, wherein said system is configured to acquire a three-dimensional reference image of an area to be treated,

acquire a three-dimensional treatment image of said area to be treated;

match said reference image to said treatment image; and

calculate any differences between said reference image and said treatment images to generate patient repositioning parameters.

24. The system of claim 21, wherein said three-dimensional camera is configured to be mounted above a treatment apparatus.

25. The system of claim 21, wherein said reference scan comprises a CT scan and a three-dimensional surface image.

26. The system of claim 21, wherein said processor is configured to plan a treatment based on said reference scan.

27. The system of claim 21, wherein said matching said reference image to said treatment image includes identifying salient features of said area to be treated.

28. The system of claim 27, wherein identifying said salient features includes receiving an operator selection of said salient features.

29. The system of claim 27, wherein said processor is further configured to perform an iterative closest point algorithm to match said images.

30. The system of claim 21, wherein said processor is configured to provide information related to adjustments relative to six degrees of freedom.

31. The system of claim 21, wherein said processor is configured to perform finite element analyses of said area to be treated.

32. The system of claim 21, wherein said finite element analysis includes an analysis of multiple mesh layers having different mechanical properties.

33. The system of claim 21, wherein said processor is configured to estimate a location of a target area within said area to be treated from said three-dimensional surface image.

34. The system of claim 21, wherein matching said reference scan to said three-dimensional surface image includes establishing a first fiducial point on said reference scan, searching for a corresponding point on said three-dimensional surface image, establishing a spatial relationship between said-fiducial point and said corresponding point to determine possible locations of other corresponding points on said three-dimensional surface scan;

comparing feature vectors of corresponding points on said reference image and said three-dimensional surface scan find a rigid 4×

4 homogenous transformation to minimize the weighted least-squared distance between pairs of points.

35. A system for imaging an area to be treated, comprising:

means for capturing a reference image;

means for capturing a treatment image;

means for registering said reference image and said treatment means; and

means for calculating a difference between said reference image and said treatment image.

36. The system of claim 35, and further comprising means for providing re-positioning information.

37. The system of claim 35, where said means for capturing a treatment image comprise means for capturing a three-dimensional surface image.

38. The system of claim 35, and further comprising means for positioning a patient.

39. The system of claim 35, and further comprising means for detecting positioning error.

40. The system of claim 39, wherein said means for detecting error positioning error comprises means for detecting positioning error of a portion of a patient'"'"'s head and neck area.