Miniature gamma camera

• US 4,791,300 A
• Filed: 08/25/1986
• Issued: 12/13/1988
• Est. Priority Date: 08/25/1986
• Status: Expired due to Term

• Current Assignee: QTR Corporation
• Original Assignee: QTR Corporation
• Inventors: Yin, Lo I.
• Primary Examiner(s): Howell, Janice A.
• Application Number:
  US06/899,641
• Time in Patent Office: 841 Days
• Field of Search: 250/363 R, 250/363 S, 250/363 SA, 250/363 SB, 250/363 SE, 250/505.1, 250/370 G, 250/390 G, 250/366, 250/213 VT, 370/155
• US Class Current: 250/363.01
• CPC Class Codes: G01T 1/28 with secondary-emission detectors
• CPC Class Codes: H01J 2229/8903 Fibre optic components
• CPC Class Codes: H01J 2229/8909 Baffles, shutters, apertures or the like against external light
• CPC Class Codes: H01J 29/89 Optical or photographic arrangements structurally combined or co-operating with the vessel H01J29/866 and H01J29/868 take precedence
• CPC Class Codes: H01J 31/507 using a large number of channels, e.g. microchannel plates
• CPC Class Codes: H01J 43/30 Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for

Abstract

A completely portable, rugged camera for providing in real time, visual light images of extended objects emitting low energy X-ray and gamma-ray photons. Collimated radiation eminating from extended objects such as internal anatomical organ structures which have absorbed low dosages of radio-active isotopes, are filtered through a visible light shield, converted into visible light photons, and, alternatively magnified or demagnified while spatial orientation is maintained. The visible light photons are subsequently intensified, in one or more cascaded stages, through conversions into electrons, multiplied through micro-channel plate electron multipliers, and reconverted by a phosphor screen to visible light and provide a high spatial resolution visual light image either directly to a viewer or to a device such as an image recorder.

Claims

1. An apparatus for converting images of radiation emitting objects into visible light images, comprising:

means for providing at an exit face a plurality of aligned rays of invisible radiation from an extended radiation emitting object;

means including a microchannel plate image intensifier tube, for visible light intensification; and

input means having a continuous entry surface disposed coextensively with said exit face for receiving all of said aligned rays, for converting said plurality of aligned rays into visible light and for coupling said aligned ray providing means and said visible light intensification means.

2. The apparatus of claim 1, wherein said input means provides a plurality of conduits for passage of said visible light.

3. The apparatus of claim 2, wherein said plurality of conduits converge toward said visible light intensification means.

4. The apparatus of claim 3, wherein:

said aligned ray providing means comprising a multi-channel collimator having a multiplicity of passages for passage of said radiation towards said input means; and

said passages converge toward said input means.

5. The apparatus of claim 2, wherein said plurality of conduits diverge towards said visible light intensification means.

6. The apparatus of claim 5, wherein:

said aligned ray providing means comprises a multi-channel collimator having a multiplicity of passages for passage of said radiation towards said input means; and

said passages diverge toward said input means.

7. The apparatus of claim 1, wherein said aligned ray providing means comprises a multi-channel collimator having a multiplicity of passages for passage of said radiation.

8. The apparatus of claim 7, further comprised of means for vibrating said collimator.

9. The apparatus of claim 2, wherein said passages converge towards said input means.

10. The apparatus of claim 2, wherein said passages diverge towards said input means.

11. The apparatus of claim 1, wherein said aligned ray providing means comprises a first and a second spaced-apart multi-channel collimator each having a multiplicity of passages for passage of said radiation, said first and second collimators each defining different first major axes;

said visible light intensification means comprises a first and a second visible light intensifier disposed in a spaced-apart relation with each said intensifier defining spaced-apart second major axes; and

said input means comprises a first and second spaced-apart means for providing said coupling between respective ones of said first and second collimators and corresponding ones of said first and second visible light intensifiers, whereby said first and second intensifiers provide stereoscopic visible light images of said object.

12. The apparatus of claim 11, wherein said first major axes intersect one another within a field of view common to said first and second collimators, further comprising:

first and second viewing means coupled to respective ones of said first and second light intensifiers, for providing said stereoscopic visible light images, said first and second viewing means defining parallel third major axes intersecting said first major axes.

13. The apparatus of claim 11, wherein said first major axes intersect one another within a field of view common to said first and second collimators, and each of said first major axes is coaxially aligned with a corresponding one of said second major axes.

14. The apparatus of claim 11, wherein said first major axes intersect one another within a field of view common to said first and second collimators, and each of said first major axes transverse corresponding ones of said second major axes.

15. The apparatus of claim 11, further comprised of first and second spaced-apart viewing means coupled to respective ones of said first and second light intensifiers, for providing said stereoscopic visible light images, said first and second viewing means defining third major axes.

16. The apparatus of claim 15, wherein said third major axes are parallel and are spaded apart by a distance approximately equal to the separation between the eyes of a human observer.

17. The apparatus of claim 1, further comprised of means for vibrating said aligned ray providing means.

18. The apparatus of claim 1, wherein said visible light intensification means comprises a first microchannel plate image intensifier tube cascaded into a second microchannel plate image intensifier tube.

19. The apparatus of claim 1, wherein said microchannel plate image intensifier tube includes a double microchannel plate.

20. The apparatus of claim 1, wherein said microchannel plate image intensifier tube includes a triple microchannel plate.

21. The apparatus of claim 1, wherein said microchannel plate image intensifier tube includes a microchannel plate having curved channels.

22. The apparatus of claim 1, further comprised of a power supply providing electrical energy to operate said visible light intensification means, said power supply being powered by a pair of flashlight battery cells.

24. The apparatus of claim 19, wherein said light coupling means provides a plurality of conduits for passage of said visible light.

25. The apparatus of claim 24, wherein said plurality of conduits diverge towards said visible light intensification means.

26. The apparatus of claim 25, wherein:

said aligned ray providing means comprises a multichannel collimator having a multiplicity of passages for passage of said radiation towards said input means; and

said passages diverge toward said input means.

27. The apparatus of claim 21, wherein said plurality of conduits converge toward said visible light intensification means.

28. The apparatus of claim 27, wherein:

said aligned ray providing means comprises a multichannel collimator having a multiplicity of passages for passage of said radiation towards said input means; and

said passages converge toward said input means.

31. The apparatus of claim 20, wherein said passages converge towards said light coupling means.

32. The apparatus of claim 20, wherein said passages diverge towards said light coupling means.

41. The apparatus of claim 19, wherein said microchannel plate image intensifier tube includes a double microchannel plate.

23. An apparatus for converting images of radiation emitting objects into visible light images, comprising:

means for providing at an exit face a plurality of aligned rays of invisible radiation from an extended radiation emitting object;

means having a single and continuous entry surface disposed coextensively with said exit face for receiving all of said aligned rays, and for converting said aligned rays of radiation into visible light;

means including a microchannel plate image intensifier tube, for visible light intensification; and

means for light coupling said converting means and said visible light intensification means.

29. The apparatus of claim 23, wherein said aligned ray providing means comprises a multi-channel collimator having a multiplicity of passages for passage of said radiation.

30. The apparatus of claim 29, further comprised of means for vibrating said collimator.

33. The apparatus of claim 23, wherein:

said aligned ray providing means comprises a first and a second spaced-apart multi-chanel collimator each having a multiplicity of passages for passage of said radiation, said first and second collimators each defining different first major axes;

said converting means comprises separate and spaced apart first and second said converting means each individually disposed coextensively with a different exit face of respective ones of said first and second collimators;

said visible light intensification means comprises a first and a second visible light intensifier disposed in a spaced-apart relation with each said intensifier defining spaced-apart second major axes; and

said light coupling means comprises first and second spaced apart fiber optic means for providing said coupling between respective ones of said first and second converting means and corresponding ones of said first and second visible light intensifiers, whereby said first and second intensifiers provide stereoscopic visible light images of said object.

34. The apparatus of claim 33, further comprised of first and second spaced-apart viewing means coupled to respective ones of said first and second light intensifiers, for providing said stereoscopic visible light images, said first and second viewing means defining third major axes.

35. The apparatus of claim 34, wherein said third major axes are parallel and are spaced-apart by a distance approximately equal to the separation between the eyes of a human observer.

36. The apparatus of claim 33, wherein said first major axes intersect one another within a field of view common to said first and second collimators, further comprising:

first and second viewing means coupled to respective ones of said first and second light intensifiers, for providing said stereoscopic visible light images, said first and second viewing means defining parallel third major axes intersecting said first major axes.

37. The apparatus of claim 33, wherein said first major axes intersect one another within a field of view common to said first and second collimators, and each of said first major axes is coaxially aligned with a corresponding one of said second major axes.

38. The apparatus of claim 33, wherein said first major axes intersect one another within a field of view common to said first and second collimators, and each of said first major axes transverse correponding ones of said second major axes.

39. The apparatus of claim 23, further comprised of means for vibrating said aligned ray providing means.

40. The apparatus of claim 23, wherein said visible light intensification means comprises a first microchannel plate image intensifier tube cascaded into a second microchannel plate image intensifier tube.

42. The apparatus of claim 23, wherein said microchannel plate image intensifier tube includes a triple microchannel plate.

43. The apparatus of claim 23, wherein said microchannel plate image intensifier tube includes a microchannel plate having curved channels.

44. The apparatus of claim 23, further comprised of a power supply providing electrical energy to operate said visible light intensification means, said power supply being powered by a pair of flashlight battery cells.

45. An apparatus for converting images of radiation emitting objects into visible light images, comprising:

a multi-channel collimator having a multiplicity of passages in an ordered array providing, at an exit face, rays of invisible radiation from an extended radiation emitting object;

shielding means adjoining said exit face for allowing passage of said rays while restricting passage of light visible to the human eye;

intermediate means having a single and continuous entry face disposed coextensively with and separated by said shielding means from said exit face, for receiving all of said rays passing through said exit face and said shielding means, and for converting said rays of radiation into visible light; and

means including a first microchannel plate image intensifying tube having first input fiber optics conveying said visible light from said intermediate means to a photocathode, and a second microchannel plate image intensifying tube cascaded with said first microchannel plate image intensifying tube and having second fiber optics directly conveying invisible light from said first microchannel plate image intensifying tube to another photocathode, for providing visible light images.

46. The apparatus of claim 45, wherein said intermediate means comprises a layer of scintillating material.

47. The apparatus of claim 46, further comprising third fiber optics providing an entry surface area receiving the visible light from said scintillating material and an exit surface area adjoining said first fiber optics, the areas of said entry surface area and said exit surface area being substantially different.

48. The apparatus of claim 45, wherein said intermediate means comprises third fiber optics providing an entry surface area receiving the visible light from said intermediate means and an exit surface area adjoining said first fiber optics, the areas of said entry surface area and said exit surface area being substantially different.

49. An apparatus for converting images of radiation emitting objects into stereoscopic visible light images, comprising:

means having a multiplicity of passages for providing at first and second exit faces, two groups of rays of invisible radiation emanating from two different and partially overlapping views of an extended radiation emitting object;

said providing means defining a first major axis with said first exit face and defining a second major axis with said second exit face, said first and second major axes intersecting within a field of view of said ray providing means;

shielding means adjoining said ray providing means for allowing passage of said rays while restricting passage of light visible to the human eye;

first intermediate means having a single and continuous entry face disposed coextensively with a first one of said exit faces, for converting into visible light all of said rays emanating from said object within a first one of said views and passing through said first exit face and said shielding means;

second intermediate means having a single and continuous entry face disposed coextensively with a second one of said exit faces, for converting into second visible light all of said rays emanating from said object within a second one of said views and passing through said second exit face and said shielding means;

first means including a first microchannel plate image intensifying tubes having first input fiber optics conveying said visible light from said first intermediate means to a photocathode, for providing visible light images along a third axis; and

second means including a second microchannel plate image intensifying tube having second input fiber optics conveying said visible light from said second intermediate means to a photocathode, for providing visible light images along a fourth axis spaced apart from said third axis.

50. The apparatus of claim 49, wherein said first and second intermediate means comprises layers of scintillating material.

51. The apparatus of claim 50, further comprising third and fourth fiber optics each providing an entry surface area respectively receiving the first visible light and the second visible light from said scintillating material and an exit surface area respectively adjoining said first and second fiber optics, the areas of said entry surface areas being substantially different from the areas of said exit surface areas.

52. The apparatus of claim 49, wherein said first and second intermediate means each comprise third and fourth fiber optics each providing an entry surface area respectively receiving the first visible light from said first intermediate means and said second visible light from said second visible means, and exit surface areas adjoining respective ones of said first and second fiber optics, the areas of said entry surface areas being substantially different from the areas of said exit surface areas.