Methods and devices for analysis of x-ray images

• US 20070047794A1
• Filed: 08/31/2006
• Published: 03/01/2007
• Est. Priority Date: 10/11/2000
• Status: Abandoned Application

• Current Assignee: Imaging Therapeutics, Inc. (Conformis Incorporated)
• Original Assignee: Imaging Therapeutics, Inc. (Conformis Incorporated)
• Inventors: Lang, Philipp, Steines, Daniel
• Application Number:
  US11/514,278
• Publication Number:
  US 20070047794A1
• Time in Patent Office: Days
• US Class Current: 382/132
• CPC Class Codes: A61B 6/4423 related to hygiene or sterilisation
• CPC Class Codes: A61B 6/482 involving multiple energy imaging
• CPC Class Codes: A61B 6/505 for diagnosis of bone
• CPC Class Codes: A61B 6/583 using calibration phantoms
• CPC Class Codes: G06T 7/0012 Biomedical image inspection

Abstract

The present invention relates to methods and devices for analyzing x-ray images. In particular, devices, methods and algorithms are provided that allow for the accurate and reliable evaluation of bone structure from x-ray images.

Claims

1. A method to derive quantitative information on bone structure from a dental x-ray image comprising:

(a) obtaining a dental x-ray image, wherein the dental x-ray image includes (i) at least a portion of the maxilla or mandible and (ii) an external standard for determining bone structure; and

(b) analyzing the image obtained in step (a) to derive quantitative information on bone structure.

2. A method to derive quantitative information on bone structure from an x-ray image comprising:

(a) obtaining an x-ray image; and

(b) analyzing the image obtained in step (a) using one or more indices selected from the group consisting of Hough transform, skeleton operator, morphological operators, mean pixel intensity, variance of pixel intensity, fourier spectral analysis, fractal dimension, morphological parameters and combinations thereof, thereby deriving quantitative information on bone structure.

3. An x-ray assembly for determining bone mineral density or bone structure comprising

(a) a hygienic cover;

(b) x-ray film and

(d) a calibration phantom comprising at least one marker positioned in an area of known density or structure.

4. A method of accurately determining bone mineral density or bone structure of a dental x-ray image, the method comprising:

providing an assembly according to claim 3, wherein the calibration phantom is positioned such that x-rays pass through a subject and the calibration phantom simultaneously, wherein the image includes at least a portion of mandible or maxilla;

creating an image of the calibration phantom and the mandible or the maxilla; and

comparing the image of the calibration phantom and the subject'"'"'s anatomy to determine bone mineral density of the subject.

5. A kit comprising a hygienic cover;

a calibration phantom for bone structure or bone density comprising an integrated geometric pattern;

an x-ray imaging assembly and computer programs, wherein said computer programs analyze and assess bone mineral density or bone structure.

6. An x-ray assembly for determining bone mineral density or bone structure comprising

(a) a hygienic cover;

(b) x-ray film and

(d) a calibration phantom for measuring bone mineral density or structure or combinations thereof.

7. A method of treating a bone condition comprising

(a) obtaining an image from a subject;

(b) analyzing the image obtained in step (a) to derive quantitative information on bone structure;

(c) diagnosing a bone condition based on the analysis of step (b); and

(d) selecting and administering a suitable treatment to said subject based on said diagnosis.

8. A method of determining bone mineral density from an x-ray image, the method comprising the steps of

(a) determining density of one or more internal standards in said image;

(b) creating a weighted mean between the values obtained in step (a);

(c) utilizing said weighted mean to determine bone mineral density of bone in said image.

9. A method of determining bone structure from an x-ray image comprising the steps of

(a) identifying one or more internal standards on said x-ray image;

(b) determining the density or structure of said standard; and

(c) utilizing the density, structure or combinations thereof of said standard to determine bone structure of the x-ray image.

10. A method of evaluating bone disease in a subject, the method comprising the steps of:

(a) obtaining an x-ray image from said subject, wherein said image includes one or more bones;

(b) assessing bone mineral density in at least one anatomic region of said image;

(c) assessing bone structure in said region; and

(d) combining said assessments of bone mineral density and bone structure to evaluate bone disease.

11. A method of treating bone disease in a subject, the method comprising the steps of:

(a) obtaining an image from said subject, wherein said image includes one or more bones;

(b) assessing bone mineral density in at least one anatomic region of said image;

(c) assessing bone structure in said region;

(d) combining said assessments of bone mineral density and bone structure to evaluate bone disease;

(e) selecting a therapy based on the evaluation of bone disease; and

(f) administering said therapy to said subject.

12. A method for evaluating bone disease in a subject, the method comprising the steps of:

(a) obtaining an image of said subject wherein said image includes one or more bones;

(b) assessing bone structure of said bone in said image;

(c) assessing one or more macro-anatomical parameters in said image; and

(d) combining the assessments bone structure and macro-anatomical parameter assessment to evaluate bone disease.

13. A method for minimizing tube angulation of an x-ray tube that includes an x-ray film holder, comprising the steps of

providing an attachment mechanism;

and

attaching the x-ray system to the x-ray film holder such that tube angulation is minimized.

14. A method for minimizing tube angulation of an x-ray tube that includes a dental x-ray film holder, comprising the steps of

providing an x-ray tube alignment system;

and

aligning the x-ray system substantially perpendicular to the x-ray film such that tube angulation is minimized, wherein said alignment system uses optical aids.

15. A method of treating a bone condition comprising

(a) obtaining an image from a subject;

(b) analyzing the image obtained in step (a) to derive quantitative information on bone structure;

(c) diagnosing a bone condition based on the analysis of step (b); and

(d) selecting and administering a suitable treatment to said subject based on said diagnosis.

16. The method of claim 15, further comprising the step of comparing the information with information in a database of bone structure measurements obtained from selected subjects.

17. The method of claim 15, wherein the treatment comprises administering one or more antiresorptive agents.

18. The method of claim 15, wherein the treatment comprises administering one or more anabolic agents.

19. The method of claim 17, wherein the treatment further comprises administering one or more anabolic agents.

20. A method of determining bone mineral density from an x-ray image, the method comprising the steps of

(a) determining density of one or more internal standards in said image;

(b) creating a weighted mean between the values obtained in step (a);

(c) utilizing said weighted mean to determine bone mineral density of bone in said image.

21. The method of claim 20, wherein the internal references are selected from the group consisting of air, fat, water, metal and combinations thereof.

22. A method of determining bone structure from an x-ray image comprising the steps of

(a) identifying one or more internal standards on said x-ray image;

(b) determining the density or structure of said standard; and

(c) utilizing the density, structure or combinations thereof of said standard to determine bone structure of the x-ray image.

23. The method of claim 22, wherein said internal standard is selected from the group consisting of a tooth, a portion of a tooth, cortical bone, air, subcutaneous fat, and muscle.

24. A method of evaluating bone disease in a subject, the method comprising the steps of:

(a) obtaining an x-ray image from said subject, wherein said image includes one or more bones;

(b) assessing bone mineral density in at least one anatomic region of said image;

(c) assessing bone structure in said region; and

(d) combining said assessments of bone mineral density and bone structure to evaluate bone disease.

25. The method of claim 24, wherein said bone disease comprises the risk of bone fracture or the risk of osteoporotic fracture.

26. The method of claim 24, wherein said evaluation comprises diagnosing bone disease.

27. The method of claim 24, wherein said evaluation comprises monitoring the progression of bone disease.

28. The method of claim 24, further comprising selecting a therapy based on the evaluation of bone disease and administering said therapy to said subject.

29. The method of claim 28, wherein said evaluation comprises monitoring the progression of bone disease during or after administration of said selected therapy.

30. The method of claim 24, further comprising the step of assessing one or more macro-anatomical parameters in said image and combining said assessment of bone mineral density, bone structure and macro-anatomical parameters to diagnose bone disease.

31. A method of treating bone disease in a subject, the method comprising the steps of:

(a) obtaining an image from said subject, wherein said image includes one or more bones;

(b) assessing bone mineral density in at least one anatomic region of said image;

(c) assessing bone structure in said region;

(d) combining said assessments of bone mineral density and bone structure to evaluate bone disease;

(e) selecting a therapy based on the evaluation of bone disease; and

(f) administering said therapy to said subject.

32. The method of claim 31, wherein steps (a) to (d) are repeated.

33. The method of claim 31, wherein steps (a) to (e) are repeated.

34. A method for evaluating bone disease in a subject, the method comprising the steps of:

(a) obtaining an image of said subject wherein said image includes one or more bones;

(b) assessing bone structure of said bone in said image;

(c) assessing one or more macro-anatomical parameters in said image; and

(d) combining the assessments bone structure and macro-anatomical parameter assessment to evaluate bone disease.

35. The method of claim 34, wherein said bone disease comprises the risk of bone fracture.

36. The method of claim 35, wherein said fracture is osteoporotic fracture.

37. The method of claim 34, wherein said evaluation comprises diagnosing bone disease.

38. The method of claim 34, wherein said evaluation comprises monitoring the progression of bone disease.

39. The method of claim 38, wherein the monitoring comprises comprises repeating steps (a) to (d) at two or more time points.

40. The method of claim 34, further comprising selecting a therapy based on the evaluation of bone disease and administering said therapy to said subject.

41. The method of claim 40, wherein said evaluation comprises monitoring the progression of bone disease during or after administration of said selected therapy.

42. A method for minimizing tube angulation of an x-ray tube that includes an x-ray film holder, comprising the steps of

providing an attachment mechanism;

and

attaching the x-ray system to the x-ray film holder such that tube angulation is minimized.

43. The method of claim 43, wherein said x-ray film bolder includes a Rinn instrument.

44. The method of claim 43, wherein said attachment mechanism is mechanical.

45. The method of claim 43, wherein said attachment mechanism is electromagnetic.

46. The method of claim 43, wherein said attachment mechanism uses Velcro or and adhesive.

47. A method for minimizing tube angulation of an x-ray tube that includes a dental x-ray film holder, comprising the steps of

providing an x-ray tube alignment system;

and

aligning the x-ray system substantially perpendicular to the x-ray film such that tube angulation is minimized, wherein said alignment system uses optical aids.

48. The method of claim 47, wherein said optical aid comprises one or more levels.

49. The method of claim 47, wherein said optical aid comprises one or more cross-hairs.

50. The method of claim 47, wherein said optical aid comprises one or more points or areas of light.