System and method for simultaneously detecting phase modulated optical signals

Patent metadata

Field	Value
Publication number	US-11058301-B2
Application number	US-201815939603-A
Country	US
Kind code	B2
Filing date	Mar 29, 2018
Priority date	Nov 22, 2017
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

An optical detection method and system are provided. Sample light is delivered into an anatomical structure having a target voxel, whereby a portion of the sample light passing through the target voxel is scattered by the anatomical structure as signal light, and another portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light that is combined with the signal light to create a sample light pattern. The sample light pattern and the reference light having an M number of different phases are concurrently combined to respectively generate an M number of interference light patterns. The M number of interference light patterns are detected. M pluralities of values representative of spatial components of the respective M number of interference light patterns are generated, and a physiologically-dependent optical parameter of the target voxel is determined based on the M pluralities of values.

First claim

What is claimed is:

1. A non-invasive optical detection system, comprising:
an interferometer configured for delivering sample light into the anatomical structure having a target voxel, whereby a portion of the sample light passing through the target voxel is scattered by the anatomical structure as signal light, and another portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light that is combined with the signal light to create a sample light pattern, the interferometer comprising at least one beam splitter/combiner configured for concurrently combining the sample light pattern and reference light having an M number of different phases, to respectively generate an M number of interference light patterns, wherein each of the at least one beam splitter/combiner is configured for splitting the sample light pattern received at a first input port into a reflected sample light pattern portion and a transmitted sample light pattern portion, and splitting the reference light received at a second input port into a transmitted reference light portion and a reflected reference light portion, such that the reflected sample light pattern portion interferes with the transmitted reference light portion to generate one of the M number of interference light patterns at a first output port, and the transmitted sample light pattern portion interferes with the reflected reference light portion to generate another one of the M number of interference light patterns at a second output port;
a camera system having an M number of optically registered detector arrays respectively configured for detecting the M number of interference light patterns, and generating M pluralities of values representative of spatial components of the respective M number of interference light patterns; and a processor configured for determining a physiologically-dependent optical parameter of the target voxel based on the M pluralities of values.

2. The system of claim 1 , wherein M equals two, and the at least one beam splitter/combiner comprises a single beam splitter/combiner configured for splitting the reference light respectively into two of the different phases, and concurrently combining the sample light pattern and the reference light having the two different phases to respectively generate the two interference light patterns.

3. The system of claim 1 , wherein the interferometer comprises at least one beam splitter configured for splitting the sample light pattern into an M number of sample light pattern portions, and wherein the interferometer is configured for concurrently combining the sample light pattern and the reference light having the M number of different phases by respectively combining the M number of sample light pattern portions and the reference light having the M number of different phases.

4. The system of claim 1 , wherein the M number of detector arrays are mechanically disposed on separate camera microchips.

5. The system of claim 1 , wherein the M number of detector arrays are mechanically integrated together on a single camera microchip.

6. The system of claim 5 , further comprising processing circuitry integrated within the single camera microchip, the processing circuitry configured for performing an arithmetic function on the M pluralities of values, and outputting at least one value, wherein the processor is configured for determining the physiologically-dependent optical parameter of the target voxel based on the at least one value.

7. The system of claim 6 , wherein the function comprises a sum of the absolute differences between corresponding values of the M pluralities of values.

8. The system of claim 5 , wherein the interferometer comprises at least one array of beam splitter/combiners integrated within the single camera microchip, the at least one array of beam splitter/combiners configured for splitting the reference light respectively into the M number of different phases, and concurrently combining the sample light pattern and the reference light having the M number of different phases to respectively generate the M number of interference light patterns.

9. The system of claim 8 , wherein the M number of detector arrays are interlaced with each other on the single camera microchip.

10. The system of claim 1 , wherein the physiologically-dependent optical parameter is at least one of the level of deoxygenated and/or oxygenated hemoglobin concentration or relative abundance, and the level of water concentration or relative water concentration of brain matter.

11. The system of claim 1 , wherein the signal light is frequency encoded.

12. The system of claim 11 , further comprising an acoustic assembly configured for delivering ultrasound into the target voxel, such that the signal light is frequency shifted by the ultrasound.

13. The system of claim 12 , further comprising a controller configured for operating the acoustic assembly and the interferometer to pulse the ultrasound and the sample light in synchrony, such that only the signal light is frequency shifted by the ultrasound.

14. The system of claim 13 , wherein the controller is configured for operating the acoustic assembly and the interferometer to pulse the ultrasound and the sample light in synchrony, such that only a single pulse of the sample light is delivered into the anatomical structure for each pulse of the ultrasound delivered into the target voxel.

15. The system of claim 11 , wherein the interferometer is configured for combining the signal light and the reference light in a homodyne manner.

16. The system of claim 15 , wherein the interferometer is further configured for frequency shifting the sample light by the frequency of the ultrasound, such that the signal light and the reference light are combined in the homodyne manner.

17. The system of claim 1 , wherein the interferometer comprises a light source configured for generating source light, a beam splitter configured for splitting the source light into the sample light and the reference light.

18. The system of claim 1 , wherein the processor is configured for computing the amplitude of the signal light using the plurality of values generated by each detector array, and determining the physiologically-dependent optical parameter of the target voxel based on the computed amplitude of the signal light.

19. The system of claim 18 , wherein the plurality of values generated by each detector array are intensities of the spatial components of the respective interference light pattern, the processor is configured for using the plurality of values generated by each detector array to determine a product of the amplitude of the signal light and a known amplitude of the reference light, and determining the amplitude of the signal light from the determined product.

20. The system of claim 1 , wherein the transmitted reference light portion has a nominal phase of 0, and the reflected reference light portion has a nominal phase of π.

21. A non-invasive optical detection method, comprising:
delivering sample light into an anatomical structure having a target voxel, whereby a portion of the sample light passing through the target voxel is scattered by the anatomical structure as signal light, and another portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light that is combined with the signal light to create a sample light pattern;
concurrently combining the sample light p

Assignees

• Hi Llc

Inventors

• Yang Changhuei
• Marblestone Adam
• Alford Jamu
• Sobek Daniel

Classifications

• H04N23/45

  for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images · CPC title

• H04N23/56

  provided with illuminating means · CPC title

• A61B5/6814

  Head · CPC title

• H04N5/76

  Television signal recording · CPC title

• A61B5/0073

  by tomography, i.e. reconstruction of 3D images from 2D projections (A61B5/0066 takes precedence) · CPC title