TISSUE IMAGING SYSTEM

• US 20070263226A1
• Filed: 05/15/2006
• Published: 11/15/2007
• Est. Priority Date: 05/15/2006
• Status: Active Grant

• Current Assignee: Carestream Dental Technology Topco Limited
• Original Assignee: Eastman Kodak Company
• Inventors: McLaughlin, Paul, Bietry, Joseph, Kurtz, Andrew
• Granted Patent: US 7,460,248 B2
• Time in Patent Office: Days
• US Class Current: 356/492
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/0066 Optical coherence imaging
• CPC Class Codes: A61B 5/412 Detecting or monitoring sepsis
• CPC Class Codes: A61B 5/445 Evaluating skin irritation or skin trauma, e.g. rash, eczema, wound, bed sore
• CPC Class Codes: G01N 21/21 Polarisation-affecting properties G01N21/19 takes precedence
• CPC Class Codes: G01N 21/23 Bi-refringence
• CPC Class Codes: G01N 21/4795 spatially resolved investigating of object in scattering medium in vivo A61B
• CPC Class Codes: G01N 21/6458 Fluorescence microscopy fluorescence microscopes per se G02B21/0076 and G02B21/16
• CPC Class Codes: G01N 21/6486 Measuring fluorescence of biological material, e.g. DNA, RNA, cells G01N21/6428 takes precedence

Abstract

A tissue imaging system (200) for examining the medical condition of tissue (290) has an illumination optical system (205), which comprises a light source (220), having one or more light emitters, beam shaping optics, and polarizing optics. An optical beamsplitter (260) directs illumination light to an imaging sub-system, containing a spatial light modulator array (300). An objective lens (325) images illumination light from the spatial light modulator array to the tissue. An optical detection system (210) images the spatial light modulator to an optical detector array. A controller (360) drives the spatial light modulator to provide time variable arrangements of on-state pixels. The objective lens operates in a nominally telecentric manner relative to both the spatial light modulator and the tissue. The polarizing optics are independently and iteratively rotated to define variable polarization states relative to the tissue. The modulator pixels optically function like pinholes relative to the illumination light and the image light.

Claims

1. A tissue imaging system for imaging optically examining the medical condition of tissue comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters, beam shaping optics, and polarizing optics, which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it to an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said tissue and for collecting image light from said tissue and imaging said image light to said spatial light modulator array;

e) an optical detection system, comprising focusing optics and polarizing optics which image said spatial light modulator to an optical detector array;

f) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light;

wherein said objective lens operates in a nominally telecentric manner relative to both said spatial light modulator and to said tissue;

wherein said polarizing optics, provided in said illumination optical system and said optical detection system, are independently and iteratively rotated so as to define variable polarization states relative to said tissue; and

wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

2. A system as in claim 1 wherein said focus means is an optical device operating in telecentric optical space between said objective lens and said tissue.

3. A system as in claim 1 wherein said controller is provided for operating at least said light source, said detector array, said focus control, and said rotational motion of said polarizers.

4. A system as in claim 1 wherein said polarizing optics, provided in both said illumination optical system and said optical detection system, are crossed so as to pass orthogonal polarization states.

5. A system as in claim 1 wherein said polarizing optics, provided in either or both said illumination optical system and said optical detection system, include wire grid polarizers.

6. A system as in claim 1 wherein said polarizing optics, provided in either or both said illumination optical system and said optical detection system, include a wave plate.

7. A system as in claim 1 wherein said illumination optical system includes an optical uniformizer for homogenizing said illumination light.

8. A system as in claim 1 wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

9. A system as in claim 8 wherein said system operates in a confocal imaging modality.

10. A system as in claim 1 wherein said focus means comprises an assembly of opposing wedge prisms which are slid laterally relative to each other, to alter the optical path length of the transiting illumination and imaging light.

11. A system as in claim 1 wherein said focusing optics of said optical detection system includes an arrangement of lenslet arrays to sample and image said image light onto said optical detector array.

12. A system as in claim 1 wherein said objective lens includes a pupil plane filter located at an aperture stop plane.

13. A system as in claim 1 wherein said spatial light modulator array is a MEMS device or a LCD device.

14. A system as in claim 1 wherein said light source comprises at least one of he following;

a laser, a super-luminescent diode, an LED, or a lamp.

15. A system as in claim 1 wherein said illumination light comprises light in one spectral band and said image light comprises light in a second spectral bad.

16. A system as in claim 1 wherein said illumination light excites a fluorescence in said tissue, producing an emission light, a portion of which comprises said image light.

17. A system as in claim 1 wherein said system is assembled into a housing which includes supports for providing a stable mechanical interaction with said tissue.

18. A tissue imaging system for imaging optically examining the medical condition of tissue comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters, beam shaping optics, which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said tissue and for collecting image light from said tissue and imaging said image light to said spatial light modulator array;

e) an optical detection system, comprising focusing optics which image said spatial light modulator to an optical detector array;

f) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light;

wherein said objective lens operates in a nominally telecentric manner relative to both said spatial light modulator and to said tissue; and

wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

19. A system as in claim 18 wherein said focus control means is an optical device operating in telecentric optical space between said objective lens and said tissue.

20. A system as in claim 18 wherein said focus control means comprises a mechanism utilizing two wedge plates to control the optical path length in telecentric optical space.

21. A system as in claim 18 wherein said controller is provided for operating at least said light source, said detector array, said focus control, and for providing image processing of the captured images to aid the diagnostic process.

22. A system as in claim 18 wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

23. A system as in claim 22 wherein said system operates in a confocal imaging modality.

24. A system as in claim 18 wherein a reference arm, comprising a reference imaging lens and a reference mirror, is provided, to enable said system to operate in an optical coherence tomography imaging modality or a combination confocal imaging and optical coherence tomography imaging modality.

25. A system as in claim 18 wherein said spatial light modulator array is operated in a state where all pixels are open, thereby enabling said system to operate as a digital photographic image capture device.

26. A tissue imaging system for imaging optically examining the medical condition of tissue comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters, beam shaping optics, and polarizing optics, which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said tissue and for collecting image light from said tissue and imaging said image light to said spatial light modulator array;

e) an optical detection system, comprising focusing optics and polarizing optics which image said spatial light modulator to an optical detector array;

f) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light;

wherein said polarizing optics, provided in said illumination optical system and said optical detection system, are independently and iteratively rotated so as to define variable polarization states relative to said tissue; and

wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

27. A system as in claim 26 wherein said polarizing optics, provided in both said illumination optical system and said optical detection system, are crossed so as to pass orthogonal polarization states.

28. A system as in claim 26 wherein said controller is provided for operating at least said light source, said detector array, said focus control, and said rotational motion of said polarizers.

29. A system as in claim 26 wherein a reference arm, comprising a reference imaging lens and a reference mirror, is provided, to enable said system to operate in an optical coherence tomography imaging modality or a combination confocal imaging and optical coherence tomography imaging modality.

30. A system as in claim 26 wherein said spatial light modulator array is operated in a state where all pixels are open, thereby enabling said system to operate as a digital photographic image capture device.

31. An optical imaging system for examining a sample comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters, beam shaping optics, and polarizing optics, which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said sample and for collecting image light from said sample and imaging said image light to said spatial light modulator array;

e) an optical detection system, comprising focusing optics and polarizing optics which image said spatial light modulator to an optical detector array;

f) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light;

wherein said objective lens operates in a nominally telecentric manner relative to both said spatial light modulator and to said sample;

wherein said polarizing optics, provided in said illumination optical system and said optical detection system, are independently and iteratively rotated so as to define variable polarization states relative to said tissue; and

wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

32. A system as in claim 31 wherein said controller is provided for operating at least said light source, said detector array, said focus control, and said rotational motion of said polarizers.

33. A system as in claim 31 wherein said focusing optics of said optical detection system includes an arrangement of lenslet arrays to sample and image said image light onto said optical detector array.

34. A system as in claim 31 wherein said focus control means comprises a mechanism utilizing two wedge plates to control the optical path length in telecentric optical space.

35. A system as in claim 31 wherein said operation of said spatial light modulator array such that said modulator pixels optically function like pinholes relative to said illumination light and said image light enables a confocal imaging modality.

36. A system as in claim 31 wherein said spatial light modulator array is operated in a state where all pixels are open, thereby enabling said system to operate as a digital photographic image capture device.

37. A system as in claim 31 wherein a reference arm, comprising a reference imaging lens and a reference mirror, is provided, to enable said system to operate in an optical coherence tomography imaging modality or a combination confocal imaging and optical coherence tomography imaging modality.

38. A system as in claim 31 wherein said illumination light comprises light in one spectral band and said image light comprises light in a second spectral bad.

39. A system as in claim 31 wherein said illumination light excites a fluorescence in said tissue, producing an emission light, a portion of which comprises said image light.

40. A tissue imaging system for imaging optically examining the medical condition of tissue comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters, beam shaping optics, polarizing optics, and an optical addressing means, which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said tissue and for collecting image light from said tissue and imaging said image light to said spatial light modulator array;

e) an optical detection system, comprising focusing optics and polarizing optics which image said spatial light modulator to an optical detector array;

f) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light;

wherein said objective lens operates in a nominally telecentric manner relative to both said spatial light modulator and to said tissue; and

wherein said polarizing optics, provided in said illumination optical system and said optical detection system, are independently and iteratively rotated so as to define variable polarization states relative to said tissue.

41. A system as in claim 40 wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

42. A system as in claim 41 wherein said system operates in a confocal imaging modality.

43. A system as in claim 41 wherein a first quantity of said modulator pixels are simultaneously driven to said on-state and are addressed with illumination light, and a second quantity of said modulator pixels proximate to each of said first quantity of modulator pixels are also driven to an on-state.

44. A system as in claim 43 wherein said system operates in a diffuse optical imaging modality.

45. A system as in claim 40 wherein a reference arm, comprising a reference imaging lens and a reference mirror, is provided, to enable said system to operate in an optical coherence tomography imaging modality or a combination confocal imaging and optical coherence tomography imaging modality.

46. A system as in claim 40 wherein said optical addressing means is a second spatial light modulator array or a multi-beam generator.

47. A system as in claim 46 wherein both said spatial light modulator array of said imaging subsystem and said second spatial light modulator array are simultaneously operated in a state where all pixels are open, thereby enabling said system to operate as a digital photographic image capture device.

48. A system as in claim 40 wherein said light source is an array of said multiple emitters configured to provide said addressing means of said spatial light modulator array, with a given emitter illuminating a subset of one or more of said modulator pixels.

49. A system as in claim 40 wherein said focus means is an optical device operating in telecentric optical space between said objective lens and said tissue.

50. A system as in claim 40 wherein said controller is provided for operating at least said light source, said detector array, said focus control, and said rotational motion of said polarizers.

51. A system as in claim 40 wherein said polarizing optics, provided in both said illumination optical system and said optical detection system, are crossed so as to pass orthogonal polarization states.

52. A system as in claim 40 wherein said polarizing optics, provided in both said illumination optical system and said optical detection system, include wire grid polarizers.

53. An optical imaging system for optically examining a sample comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters, beam shaping optics, polarizing optics, and an optical addressing means, which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said sample and for collecting image light from said sample and imaging said image light to said spatial light modulator array;

e) an optical detection system, comprising focusing optics and polarizing optics which image said spatial light modulator to an optical detector array;

f) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light; and

wherein said polarizing optics, provided in said illumination optical system and said optical detection system, are independently and iteratively rotated so as to define variable polarization states relative to said sample.

54. A system as in claim 53 wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

55. A system as in claim 54 wherein said system operates in a confocal imaging modality.

56. A system as in claim 54 wherein a first quantity of said modulator pixels are simultaneously driven to said on-state and are addressed with illumination light, and a second quantity of said modulator pixels proximate to each of said first quantity of modulator pixels are also driven to an on-state.

57. A system as in claim 56 wherein said system operates in a diffuse optical imaging modality.

58. A system as in claim 53 wherein a reference arm, comprising a reference imaging lens and a reference mirror, is provided, to enable said system to operate in an optical coherence tomography imaging modality or a combination confocal imaging and optical coherence tomography imaging modality.

59. A system as in claim 53 wherein said optical addressing means is a second spatial light modulator array or a multi-beam generator.

60. A system as in claim 53 wherein said light source is an array of said multiple emitters configured to provide said addressing means of said spatial light modulator array, with a given emitter illuminating a subset of one or more of said modulator pixels.

61. An optical imaging system for examining a sample comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters, beam shaping optics, an optical addressing means, which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said sample and for collecting image light from said sample and imaging said image light to said spatial light modulator array;

e) an optical detection system, comprising focusing optics which image said spatial light modulator to an optical detector array;

f) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light; and

wherein said objective lens operates in a nominally telecentric manner relative to both said spatial light modulator and to said sample.

62. A system as in claim 61 wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

63. A system as in claim 62 wherein said system operates in a confocal imaging modality.

64. A system as in claim 62 wherein a first quantity of said modulator pixels are simultaneously driven to said on-state and are addressed with illumination light, and a second quantity of said modulator pixels proximate to each of said first quantity of modulator pixels are also driven to an on-state.

65. A system as in claim 64 wherein said system operates in a diffuse optical imaging modality.

66. A system as in claim 61 wherein a reference arm, comprising a reference imaging lens and a reference mirror, is provided, to enable said system to operate in an optical coherence tomography imaging modality, a confocal imaging modality, or a combination confocal imaging and optical coherence tomography imaging modality.

67. A system as in claim 61 wherein said optical addressing means is a second spatial light modulator array or a multi-beam generator.

68. A system as in claim 61 wherein said light source is an array of said multiple emitters configured to provide said addressing means of said spatial light modulator array, with a given emitter illuminating a subset of one or more of said modulator pixels.

69. A system as in claim 61 wherein said focus means is an optical device operating in telecentric optical space between said objective lens and said sample.

70. A system as in claim 61 wherein said objective lens includes a pupil plane filter located at an aperture stop plane.

71. A system as in claim 61 wherein said focusing optics of said optical detection system includes an arrangement of lenslet arrays to sample and image said image light onto said optical detector array.

72. An optical imaging system for examining a sample comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters and beam shaping optics which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said sample and for collecting image light from said sample and imaging said image light to said spatial light modulator array;

e) a reference arm comprising a lens and a moving mirror;

f) an optical detection system, comprising focusing optics which image said spatial light modulator to an optical detector array; and

g) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light.

73. A system as in claim 72 wherein said objective lens operates in a nominally telecentric manner relative to both said spatial light modulator and to said sample.

74. A system as in claim 73 wherein said focus means is an optical device operating in telecentric optical space between said objective lens and said sample.

75. A system as in claim 72 wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

76. A system as in claim 72 which is capable of providing an optical coherence tomography imaging modality, a confocal imaging modality, or a combination confocal imaging and optical coherence tomography imaging modality.

77. A system as in claim 72 wherein said controller is provided for operating at least said light source, said detector array, said focus control, and for providing image processing of the captured images to aid the diagnostic process.

78. A system as in claim 72 wherein said illumination system includes an optical addressing means.

79. A system as in claim 78 wherein said optical addressing means is a second spatial light modulator array or a multi-beam generator.

80. A system as in claim 72 wherein said illumination optical system and said optical detection system both include polarization optics.

81. A system as in claim 80 wherein said polarizing optics are crossed so as to pass orthogonal polarization states.

82. A system as in claim 80 wherein said polarizing optics are independently and iteratively rotated so as to define variable polarization states relative to said sample.

83. An optical imaging system for examining a specimen comprising:

a) an illumination optical system, comprising a light source, having one or more light emitters and beam shaping optics which together provide illumination light;

b) an optical beamsplitter which accepts illumination light from said illumination system and directs it an imaging sub-system;

c) a spatial light modulator array within said imaging sub-system;

d) an objective lens with a focus control means for imaging illumination light from said spatial light modulator array to said specimen and for collecting image light from said specimen and imaging said image light to said spatial light modulator array;

e) an optical detection system, comprising focusing optics which image said spatial light modulator to an optical detector array;

f) a controller which drives said spatial light modulator to provide time variable arrangements of on-state pixels, wherein each of said on-state pixels transmits beams of said illumination light; and

wherein said focusing optics of said optical detection system includes an arrangement of lenslet arrays to sample and image said image light onto said optical detector array.

84. A system as in claim 83 wherein said focusing optics create an intermediate image, which is sampled and re-imaged by said arrangement of lenslet arrays in a partially overlapping fashion onto said optical detector array.

85. A system as in claim 83 wherein said objective lens operates in a nominally telecentric manner relative to both said spatial light modulator and to said sample.

86. A system as in claim 85 wherein said focus means is an optical device operating in telecentric optical space between said objective lens and said sample.

87. A system as in claim 83 wherein said spatial light modulator array is operated such that the modulator pixels optically function like pinholes relative to said illumination light and said image light.

88. A system as in claim 83 wherein said controller is provided for operating at least said light source, said detector array, said focus control, and for providing image processing of the captured images to aid the diagnostic process.

89. A system as in claim 83 wherein said illumination optical system and said optical detection system both include polarization optics.

90. A system as in claim 89 wherein said polarizing optics are crossed so as to pass orthogonal polarization states.

91. A system as in claim 89 wherein said polarizing optics are independently and iteratively rotated so as to define variable polarization states relative to said sample.