Phase dispersive tomography
First Claim
1. A method for optically measuring tissue comprising:
- providing a first wavelength and a second wavelength of light such that the second wavelength is harmonically related to the first wavelength;
directing light of the first wavelength and the second wavelength along both a first optical path and a second optical path, the first optical path extending onto the tissue to be measured and the second path undergoing a change in path length; and
detecting light from the tissue and light from the second optical path to measure a change in phase of light interacting with the tissue.
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Accused Products
Abstract
Radiation that propagates undeflected through a turbid medium, undergoes a small change in phase velocity due to its wave nature. This change can be measured using a differential phase optical interferometer. Ballistic propagation can be classified into three regimes: For scatterers small compared to the wavelength, the turbid medium acts as a bulk medium; for large scatterers, phase velocity is independent of turbidity; and in the intermediate regime the phase velocity is strongly dependent on scatterer radius. In particular, for scatterers having intermediate size a phase velocity increase and negative dispersion is observed by adding positive dispersion scatterers of higher refractive index. These measurements are made using the phase difference between fundamental and harmonic light and can be used to provide diagnostic information and images of tissue or biological fluids.
50 Citations
40 Claims
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1. A method for optically measuring tissue comprising:
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providing a first wavelength and a second wavelength of light such that the second wavelength is harmonically related to the first wavelength;
directing light of the first wavelength and the second wavelength along both a first optical path and a second optical path, the first optical path extending onto the tissue to be measured and the second path undergoing a change in path length; and
detecting light from the tissue and light from the second optical path to measure a change in phase of light interacting with the tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for optically measuring biological tissue comprising:
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providing a first wavelength and a second wavelength of light such that the second wavelength is harmonically related to the first wavelength;
providing a detector system connected to a data processor;
directing light of the first wavelength and the second wavelength along both a first optical path and a second optical path, the first optical path extending onto the tissue to be measured and the second path undergoing a change in path length;
detecting light from the tissue and light from the second optical path with the detector system to measure a change in phase of light interacting with the tissue; and
determining a characteristic of the tissue with the data processor using the measured change in phase. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A device for optically measuring a medium comprising:
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a light source that provides a first wavelength and a second wavelength of light such that the second wavelength harmonically related to the first wavelength;
an optical system that couples light of the first wavelength and the second wavelength along both a first optical path and a second optical path, the first optical path extending onto a medium to be measured and the second path undergoing a change in path length; and
a detector that detects light from the medium and light from the second optical path to measure a change in phase of light interacting with the medium. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification