Method for measuring tissue morphology

• US 6,922,583 B1
• Filed: 04/10/2000
• Issued: 07/26/2005
• Est. Priority Date: 10/10/1997
• Status: Expired due to Term

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Backman, Vadim, Manoharan, Ramasamy, Perelman, Lev T., Feld, Michael S., Itzkan, Irving, Zonios, George
• Primary Examiner(s): Lateef, Marvin M.
• Assistant Examiner(s): MANTIS MERCADER, ELENI M
• Application Number:
  US09/545,992
• Time in Patent Office: 1,933 Days
• Field of Search: 600/476, 600/478, 600/310, 356/432, 356/345, 356/346, 356/357
• US Class Current: 600/476
• CPC Class Codes: A61B 5/0075 by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy A61B5/0071 takes precedence
• CPC Class Codes: A61B 5/0084 for introduction into the body, e.g. by catheters A61B5/1459 takes precedence
• CPC Class Codes: A61B 5/0086 using infrared radiation

Abstract

The present invention relates to systems and methods for measuring one or more physical characteristics of material such as tissue using optical radiation. The system can use light that is scattered by a tissue layer to determine, for example, the size of nuclei in the tissue layer to aid in the characterization of the tissue. These methods can include the use of fiber optic devices to deliver and collect light from a tissue region of interest to diagnose, for example, whether the tissue is normal or precancerous.

Claims

1. A method of endoscopically measuring a size of a structure in a layer of tissue comprising:

directing radiation having a plurality of wavelengths in a range between 350 nm and 700 nm through an endoscope onto a region of interest in the layer of tissue;

collecting radiation from the tissue;

detecting the collected radiation to provide a detected spectrum; and

determining a size of a structure within the tissue layer from the detected spectrum.

2. The method of claim 1 further comprising determining if the region of interest includes dysplastic tissue.

3. The method of claim 1 further comprising directing radiation onto the tissue using a fiber optic probe.

4. The method of claim 1 further comprising collecting the radiation from the tissue with a fiber optic probe.

5. The method of claim 1 further comprising determining an average nuclear size of nuclei within the region of interest.

6. The method of claim 1 further comprising measuring a diameter of a tissue nucleus within the region of interest.

7. The method of claim 1 further comprising measuring a periodic component of the detected spectrum as a function of wavelength.

8. The method of claim 7 further comprising determining the size of a nucleus in the tissue from the periodic component.

9. A method of optically measuring a physical characteristic of tissue comprising:

A directing radiation having a plurality of wavelengths in a range between 350 nm and 700 nm through an endoscope onto a region of interest in tissue to be measured;

collecting radiation from the tissue; and

measuring a periodic component of collected radiation as a function of wavelength to determine a physical characteristic of the tissue.

10. The method of claim 9 further comprising determining if the region of interest includes dysplastic tissue.

11. The method of claim 9 further comprising directing radiation onto the tissue using a fiber optic probe.

12. The method of claim 9 further comprising collecting the radiation from the tissue with a fiber optic probe.

13. The method of claim 9 further comprising determining an average nuclear size of nuclei within the region of interest.

14. The method of claim 9 further comprising measuring a diameter of a tissue nucleus within the region of interest.

15. The method of claim 9 further comprising collecting radiation with the endoscope, the endoscope having an imaging sensor at a distal end of the endoscope.

16. The method of claim 9 further comprising determining a density of nuclei in the tissue from the periodic component.

17. A method of determining a presence of dysplasia in tissue comprising:

directing radiation having a plurality of wavelengths in a range between 350 nm and 700 nm through an endoscope onto a region of interest in an epithelial layer of tissue such that radiation is backscattered by the tissue;

collecting the backscattered radiation from the tissue;

detecting the collected backscattered radiation with a detector to provide a scattering spectrum; and

determining the presence of dysplasia in the region of interest of the tissue with the scattering spectrum.

18. The method of claim 17 further comprising determining if the region of interest includes dysplastic tissue.

19. The method of claim 17 further comprising collecting radiation in the range of 350 nm to 700 nm.

20. The method of claim 17 further comprising collecting the radiation from the tissue with a fiber optic probe.

21. The method of claim 17 further comprising determining an average nuclear size of nuclei within the region of interest.

22. The method of claim 17 further comprising measuring a diameter of a tissue nucleus within the region of interest.

23. The method of claim 17 further comprising measuring a periodic component of the scattering spectrum as a function of wavelength.

24. The method of claim 17 further comprising determining the size of a nucleus in the tissue from the periodic component.

25. A method of optically measuring a physical characteristic of a material comprising:

directing radiation having a plurality of wavelenths in a range between 350 nm and 700 nm through an endoscope onto a region of interest in the material tissue to be measured;

collecting radiation from the material;

detecting a scattering spectrum from the collected radiation; and

measuring a periodic component from the scattering spectrum as a function of wavelength to determine a physical characteristic of the material.

26. The method of claim 25 further comprising directing radiation onto the material using a fiber optic probe.

27. The method of claim 25 further comprising collecting the radiation from the material with a fiber optic probe, the probe having an optical fiber with a numerical aperture in a range of 0.05-0.25.

28. The method of claim 25 further comprising determining an average nuclear size of nuclei within the region of interest.

29. The method of claim 25 further comprising measuring a number of particles per unit area within the region of interest.

30. An endoscope apparatus for optically measuring a physical characteristic of tissue comprising:

a radiation source that illuminates a region of interest in tissue to be measured through an endoscope with radiation having a plurality of wavelengths in a range between 350 nm and 700 nm;

an optical system in the endoscope that collects radiation from the tissue;

a detector system that senses the collected radiation; and

a data processor that determines a periodic component of detected radiation as a function of wavelength to determine a physical characteristic of the tissue.

31. The apparatus of claim 30 wherein the radiation source comprises a broadband light source.

32. The apparatus of claim 30 further comprising a fiber optic probe that couples the source to the tissue.

33. The apparatus of claim 30 further comprising a fiber optic probe that collects the light in a collection angle between 2 and 12 degrees.

34. The apparatus of claim 33 wherein the fiber optic probe is insertable in an endoscope.