Probes and pressure modulation algorithms for reducing extratissue contamination in hemodynamic measurement
First Claim
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1. A method, comprising:
- measuring moving particles in a tissue,the measuring comprising illuminating a first tissue region having moving particles and illuminating a second tissue region superficial to the first tissue region, the second tissue region having moving particles;
with a first source-detector pair, collecting illumination scattered by the moving particles of the first tissue region,with a second source-detector pair, collecting illumination scattered by the moving particles of the second tissue region,forming a signal based on the illumination collected by the first source-detector pair and the second source-detector pair,the source and detector of the first source-detector pair being separated by a first distance,the source and detector of the second source-detector pair being separated by a second distance, the second distance being greater than the first distance,the collecting being performed under application of (a) one or more perturbations directed to the second tissue region, (b) one or more perturbations proximate to the location of the first source-detector pair, proximate to the second source source-detector pair, or proximate to both the first and second source-detector pairs, or (c) any combination of (a) and (b),at least one perturbation effecting a hemodynamic change in the second tissue region,isolating in the signal an isolated component related to illumination scattered by the moving particles of the second tissue region, andestimating, based on the isolated component, a hemodynamic quantity of the first tissue region from the collected illumination.
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Abstract
The present disclosure provides devices and methods for improved hemodynamic monitoring, including techniques for reducing signals related to hemodynamic activity outside the tissue or region of interest.
17 Citations
16 Claims
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1. A method, comprising:
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measuring moving particles in a tissue, the measuring comprising illuminating a first tissue region having moving particles and illuminating a second tissue region superficial to the first tissue region, the second tissue region having moving particles; with a first source-detector pair, collecting illumination scattered by the moving particles of the first tissue region, with a second source-detector pair, collecting illumination scattered by the moving particles of the second tissue region, forming a signal based on the illumination collected by the first source-detector pair and the second source-detector pair, the source and detector of the first source-detector pair being separated by a first distance, the source and detector of the second source-detector pair being separated by a second distance, the second distance being greater than the first distance, the collecting being performed under application of (a) one or more perturbations directed to the second tissue region, (b) one or more perturbations proximate to the location of the first source-detector pair, proximate to the second source source-detector pair, or proximate to both the first and second source-detector pairs, or (c) any combination of (a) and (b), at least one perturbation effecting a hemodynamic change in the second tissue region, isolating in the signal an isolated component related to illumination scattered by the moving particles of the second tissue region, and estimating, based on the isolated component, a hemodynamic quantity of the first tissue region from the collected illumination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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measuring moving particles in a tissue, the measuring comprising illuminating a first tissue region having moving particles and illuminating a second tissue region superficial to the first tissue region, the second region having moving particles; with a first source-detector pair, collecting illumination scattered by the moving particles of the first tissue region, with a second source-detector pair, collecting illumination scattered by the moving particles of the second tissue region, forming a signal based on the illumination collected by the first source-detector pair and the second source-detector pair, the source and detector of the first source-detector pair being separated by a first distance, the source and detector of the second source-detector pair being separated by a second distance, the second distance being greater than the first distance, the collecting being performed under application of (a) one or more perturbations directed to the second tissue region, (b) one or more perturbations proximate to the location of the first source-detector pair, proximate to the second source source-detector pair, or proximate to both the first and second source-detector pairs, or (c) any combination of (a) and (b), at least one perturbation effecting a hemodynamic change in the second tissue region, isolating in the signal an isolated component related to illumination scattered by the moving particles of the second tissue region, and estimating a blood flow of the first tissue region from the collected illumination, wherein the estimating comprises application of the DOS/NIRS Modified Beer-Lambert law to the isolated component of the signal.
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Specification