Optical measurement of tissue blood flow, hemodynamics and oxygenation
First Claim
1. A method for determining one or more characteristics of tissue of a subject, the subject having a surface exposed to at least one light source, the method comprising:
- measuring a motion of moving scattering particles in the tissue,wherein the motion of the moving scattering particles is derived at least in part from light field fluctuations,the light field fluctuations measured, at least in part, by a light temporal autocorrelation function,the light field fluctuations caused, at least in part, by the moving scattering particles in the tissue and transmission of light through the tissue, the light produced by the least one light source;
measuring blood oxygenation, oxy and deoxy-hemoglobin characteristics, hemodynamic characteristics, and scattering characteristics of the tissue,wherein the blood oxygenation, oxy and deoxy-hemoglobin characteristics, hemodynamic characteristics, and scattering characteristics are derived, at least in part, from the transmission of light through the tissue with respect to a wavelength of light,the oxy and deoxy-hemoglobin characteristics being further derived from absorption effects and scattering effects of the tissue on the transmitted light;
determining blood flow rate characteristics based at least in part on collected optical data, the collected optical data based, at least in part, on the motion of the moving scattering particles, the absorption effects of the tissue, and the scattering effects of the tissue; and
determining oxygen metabolism of the tissue and changes of the tissue based at least in part on the blood flow rate characteristics and the oxy and deoxy-hemoglobin characteristics,at least a portion of the tissue being at least one centimeter beneath the surface.
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Accused Products
Abstract
An embodiment of the invention includes a device, system and method for determining the characteristics of deep tissue. The novel method includes measuring blood flow rate and oxygenation characteristics of the tissue, and determining oxygen metabolism of the tissue as a function of the measure blood flow rate and measure oxygenation. The blood flow rate characteristics are measured as a function of light fluctuations caused by the tissue, while the oxygenation characteristics are measured as a function of transmission of light through the tissue with respect to the wavelength of light. The tissue may be layered tissue, for example, a portion of a brain. The tissue characteristics may be measured during times of varying levels of exercise intensity.
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Citations
42 Claims
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1. A method for determining one or more characteristics of tissue of a subject, the subject having a surface exposed to at least one light source, the method comprising:
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measuring a motion of moving scattering particles in the tissue, wherein the motion of the moving scattering particles is derived at least in part from light field fluctuations, the light field fluctuations measured, at least in part, by a light temporal autocorrelation function, the light field fluctuations caused, at least in part, by the moving scattering particles in the tissue and transmission of light through the tissue, the light produced by the least one light source; measuring blood oxygenation, oxy and deoxy-hemoglobin characteristics, hemodynamic characteristics, and scattering characteristics of the tissue, wherein the blood oxygenation, oxy and deoxy-hemoglobin characteristics, hemodynamic characteristics, and scattering characteristics are derived, at least in part, from the transmission of light through the tissue with respect to a wavelength of light, the oxy and deoxy-hemoglobin characteristics being further derived from absorption effects and scattering effects of the tissue on the transmitted light; determining blood flow rate characteristics based at least in part on collected optical data, the collected optical data based, at least in part, on the motion of the moving scattering particles, the absorption effects of the tissue, and the scattering effects of the tissue; and determining oxygen metabolism of the tissue and changes of the tissue based at least in part on the blood flow rate characteristics and the oxy and deoxy-hemoglobin characteristics, at least a portion of the tissue being at least one centimeter beneath the surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A device for analyzing tissue, comprising:
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a first light source configured to apply a light to the tissue; at least one light detector, the at least one light detector configured to detect at least a quantity of light transmitted through the tissue and light field fluctuations caused, at least in part, by moving scattering particles in the tissue; and a computer processor in communication with the at least one light detector, the computer processor being configured to; determine a motion of the moving scattering particles in the tissue, the motion of the moving scattering particles being derived at least in part from the light field fluctuations, the light field fluctuations measured, at least in part, by a light temporal autocorrelation function; determine blood oxygenation, oxy and deoxy-hemoglobin characteristics, hemodynamic characteristics, and scattering characteristics of the tissue, the blood oxygenation, oxy and deoxy-hemoglobin characteristics, hemodynamic characteristics, and scattering characteristics being derived, at least in part, from transmission of light through the tissue with respect to a wavelength of the light, the oxy and deoxy-hemoglobin characteristics being further derived from absorption effects and scattering effects of the tissue on the transmitted light; determine blood flow rate characteristics based at least in part on collected optical data, the collected optical data based, at least in part, on the motion of the moving scattering particles, the absorption effects of the tissue, and the scattering effects of the tissue; and determine oxygen metabolism of the tissue and changes of the tissue based at least in part on the blood flow rate characteristics and the oxy and deoxy-hemoglobin characteristics, at least a portion of the tissue being at least about one centimeter beneath the surface. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification