DIFFUSE REFLECTANCE SPECTROSCOPY DEVICE FOR QUANTIFYING TISSUE ABSORPTION AND SCATTERING

• US 20110105865A1
• Filed: 04/24/2009
• Published: 05/05/2011
• Est. Priority Date: 04/24/2008
• Status: Abandoned Application

• Current Assignee: Duke University, Wisconsin Alumni Research Foundation (University of Wisconsin System)
• Original Assignee: Duke University
• Inventors: Ramanujan, Nimala, Lo, Justin Y., Yu, Bing
• Application Number:
  US12/989,595
• Publication Number:
  US 20110105865A1
• Time in Patent Office: Days
• US Class Current: 600/310
• 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

Abstract

A diffuse reflectance spectroscopy system for quantifying electromagnetic absorption and scattering in a tissue is provided. Also provided are optical probes and methods for imaging a tissue mass. In some embodiments, the methods include the steps of contacting a tissue mass with an optical probe, wherein the optical probe includes at least one entity for emitting light that interacts with a tissue mass and then is remitted to a collecting entity, for collecting the light that has interacted with the tissue mass, wherein the collecting entity comprises a detector comprising one or more photodiodes; measuring turbid spectral data of the tissue mass using the optical probe; converting the turbid spectral data to at least one of absorption and scattering spectral data via a Monte Carlo algorithm or a diffusion algorithm; and quantifying tissue compositions and scatterer size in a tissue mass using the at least one of absorption and scattering spectral data.

Claims

1. A diffuse reflectance spectroscopy system for quantifying light absorption and scattering in a tissue mass, the system comprising:

an optical probe comprising at least one entity for emitting light that interacts with a tissue mass and then is remitted into a collecting entity, wherein the collecting entity comprises a detector comprising one or more photodiodes; and

a processing unit for converting collected light, via a Monte Carlo algorithm or a diffusion algorithm into absorption and scattering data.

2. The diffuse reflectance spectroscopy system of claim 1, wherein the entity for emitting light is present at a fixed distance external to a photodiode.

3. The diffuse reflectance spectroscopy system of claim 1, wherein the entity for emitting light comprises one or more illumination fibers, each illumination fiber being present at a fixed distance external to a photodiode, optionally adjacent to a photodiode.

4. The diffuse reflectance spectroscopy system of claim 1, wherein the entity for emitting light comprises one or more illumination fibers, each illumination fiber being present within a photodiode.

6. The diffuse reflectance spectroscopy system of claim 4, wherein the photodiode comprises an aperture, and the illumination fiber is disposed within the aperture, optionally wherein spacing is present to vary the distance between the center of the aperture and/or fiber and an edge of the photodiode.

7. The diffuse reflectance spectroscopy system of claim 1, further comprising a light source coupled to the entity for emitting light, wherein the light source optionally comprises a lamp or a plurality of light-emitting diodes (LEDs).

10. The diffuse reflectance spectroscopy system of claim 1, wherein the entity for emitting light comprises direct illumination via a lamp or a plurality of light-emitting diodes (LEDs).

13. The diffuse reflectance spectroscopy system of claim 10, wherein the entity for emitting light and collecting entities are encased in a housing, where the entity for emitting light is at a proximal end of the housing and the one or more photodiodes are at a distal end of the housing, the one or more photodiodes each comprising an aperture, whereby the entity for emitting light provides backlit illumination through each aperture into one or more photodiodes.

14. The diffuse reflectance spectroscopy system of claim 13, wherein the housing comprises one or more reflective interior surfaces.

15. The diffuse reflectance spectroscopy system of claim 1, wherein the one or more photodiodes comprises an array of photodiodes.

5. (canceled)

8-9. -9. (canceled)

11-12. -12. (canceled)

16-17. -17. (canceled)

18. An optical probe comprising at least one entity for emitting light into a tissue mass and at least one collecting entity for collecting light that has interacted with a tissue mass, wherein the collecting entity comprises one or more photodiodes.

19. The optical probe of claim 18, wherein the entity for emitting light is present at a fixed distance external to a photodiode.

20. The optical probe of claim 19, wherein the entity for emitting light comprises one or more illumination fibers, each illumination fiber being present at a fixed distance external to a photodiode.

21. The optical probe of claim 18, wherein the entity for emitting light comprises one or more LEDs.

23. The optical probe of claim 18, wherein the optical probe further comprises a housing, and the entity for emitting light is at a proximal end of the housing and the one or more photodiodes are at a distal end of the housing, whereby the entity for emitting light provides backlit electromagnetic radiation with respect to the one or more photodiodes.

24. The optical probe of claim 23, wherein the housing comprises one or more reflective interior surfaces.

25. The optical probe of claim 18, comprising one or more illumination fibers, each illumination fiber being present within a photodiode.

26. The optical probe of claim 25, wherein the illumination fiber is disposed longitudinally along the center of the photodiode.

27. The optical probe of claim 25, comprising a buffer between the photodiode and the illumination fiber.

28. The optical probe of claim 18, wherein the one or more photodiodes comprises an array of photodiodes.

22. (canceled)

29-50. -50. (canceled)