Non-invasive determination of blood components
First Claim
1. A non-invasive method of estimating an amount of hemoglobin in a bodily fluid from the color of a perfused tissue surface of a subject using a digital camera, the method comprising:
- non-invasively capturing, using the digital camera, a single image of light reflected from the perfused tissue surface of the subject and at least a reference portion of a known color reference simultaneously, the single image being a single image of pixels of a plurality of colors, the single image including red, green, and blue component values for each pixel wherein the perfused tissue surface of the subject is a conjunctiva of an eyelid;
obtaining from the single image, using at least one processor in communication with the digital camera, red, green, and blue tissue values associated with the red, green, and blue component values, respectively, corresponding to a portion-of-interest of the single image of the perfused tissue surface of the subject;
obtaining from the single image, using the at least one processor in communication with the digital camera, red, green, and blue reference values associated with the red, green, and blue component values, respectively, corresponding to the reference portion; and
calculating, using the at least one processor in communication with the digital camera, an estimated hemoglobin concentration amount as a function of the red, green, and blue tissue values and the red, green, and blue reference values.
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Accused Products
Abstract
A method of estimating an amount of a substance in a bodily fluid from the color of a tissue surface of a subject includes capturing an image including at least a portion-of-interest of the subject and at least a reference portion of a color reference, the image being a digital image of pixels of at least one color, the image including a component value for each pixel for each of the at least one color, obtaining a first value associated with at least one component value corresponding to the portion-of-interest of the subject, obtaining a second value associated with at least one component value corresponding to the reference portion, and calculating an estimated amount of the substance using the first and second values.
77 Citations
25 Claims
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1. A non-invasive method of estimating an amount of hemoglobin in a bodily fluid from the color of a perfused tissue surface of a subject using a digital camera, the method comprising:
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non-invasively capturing, using the digital camera, a single image of light reflected from the perfused tissue surface of the subject and at least a reference portion of a known color reference simultaneously, the single image being a single image of pixels of a plurality of colors, the single image including red, green, and blue component values for each pixel wherein the perfused tissue surface of the subject is a conjunctiva of an eyelid; obtaining from the single image, using at least one processor in communication with the digital camera, red, green, and blue tissue values associated with the red, green, and blue component values, respectively, corresponding to a portion-of-interest of the single image of the perfused tissue surface of the subject; obtaining from the single image, using the at least one processor in communication with the digital camera, red, green, and blue reference values associated with the red, green, and blue component values, respectively, corresponding to the reference portion; and calculating, using the at least one processor in communication with the digital camera, an estimated hemoglobin concentration amount as a function of the red, green, and blue tissue values and the red, green, and blue reference values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A non-invasive method of determining factors that influence estimation of an amount of hemoglobin in a bodily fluid from the color of a perfused tissue surface of a subject, the method comprising:
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non-invasively capturing, using a digital camera, a single image of light reflected from the perfused tissue surface of the subject and at least a reference portion of a known color reference simultaneously, the single image including pixels of a plurality of colors, the single image including red, green, and blue component values for each pixel, wherein the perfused tissue surface of the subject is a conjunctiva of an eyelid; establishing, using at least one processor in communication with the digital camera, red, green, and blue tissue factors associated with a perfused tissue surface portion-of-interest of the single image of the subject, and red, green, and blue reference factors associated with the digital camera and a reference portion-of-interest of the single image of the subject; calculating, using the at least one processor in communication with the digital camera, an estimated hemoglobin concentration amount using the single image and as a function of the red, green, and blue component values and the red, green and blue tissue factors, and the red, green, and blue reference factors; comparing, using the at least one processor in communication with the digital camera, the estimated hemoglobin concentration amount with a corresponding known amount of hemoglobin in the subject; and adjusting, if the estimated hemoglobin concentration amount has other than a desired relationship with the known amount, at least one of the red, green, and blue tissue factors, and the red, green, and blue reference factors using the at least one processor in communication with the digital camera. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system for determining a level of hemoglobin in a bodily fluid from the color of a perfused tissue surface of a subject, the system comprising:
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an imaging module configured to non-invasively capture a single color image of the perfused tissue surface of the subject and a known color reference object, wherein the perfused tissue surface is a conjunctiva of an eyelid; a color separator module in communication with the imaging module and configured to decompose the single color image into sub-images of component colors, the sub-images comprising digital component values corresponding to pixels of the single image; a portion selector module in communication with the color separator module and configured to select a first window of the single image of the perfused tissue surface and to select a second window of the single image of the color reference object; and a hemoglobin estimator module in communication with the portion selector and configured to calculate an estimated hemoglobin concentration level as a function of window values associated with component values corresponding to the first and second windows. - View Dependent Claims (19, 20, 21)
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22. A non-invasive method of estimating a concentration of hemoglobin in blood of a subject from the color of a perfused tissue surface of the subject using a digital camera, the method comprising:
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non-invasively capturing, using the digital camera, a single image of light reflected from the perfused tissue surface of the subject and at least a reference portion of a known color reference simultaneously, the single image being a single image of pixels a plurality of colors, the single image including red, green and blue component values for each pixel for each of the at least one color, wherein the perfused tissue surface of the subject is a conjunctiva of an eyelid; obtaining from the single image, using at least one processor in communication with the digital camera, red, green, and blue tissue values associated with the red, green, and blue component values, respectively, corresponding to a portion-of-interest of the single image of the perfused tissue surface of the subject; obtaining, from the single image, using the at least one processor in communication with the digital camera, red, green, and blue reference values associated with the red, green, and blue component values, respectively, corresponding to the reference portion; and calculating, using the at least one processor in communication with the digital camera, an estimated hemoglobin value indicative of a concentration of hemoglobin in the blood of the subject as a function of the red, green, and blue tissue values and the red, green, and blue reference values. - View Dependent Claims (23)
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24. A non-invasive method of determining factors that influence estimation of a concentration of hemoglobin in blood of a subject from the color of a perfused tissue surface of the subject, the method comprising:
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non-invasively capturing, using a digital camera, a single image of light reflected from the perfused tissue surface of the subject and at least a reference portion of a known color reference simultaneously, the single image including pixels of a plurality of colors, the single image including red, green and blue component values for each pixel, wherein the perfused tissue surface of the subject is a conjunctiva of an eyelid; establishing, using at least one processor in communication wiht the digital camera, red, green, and blue tissue factors associated with the digital camera and a tissue portion-of-interest of the single image of the subject, and red, green, and blue reference factors associated with the digital camera and a reference portion-of-interest of the single image of the subject; calculating, using the at least one processor in communication with the digital camera, an estimated hemoglobin level, using the single image, that is indicative of a concentration of hemoglobin in the blood of the subject as a function of the red, green, and blue component values and the red, green, and blue tissue factors and the red, green, and blue reference factors; comparing, using the at least one processor in communication with the digital camera, the estimated hemoglobin level with a corresponding known amount of hemoglobin in the subject; and adjusting, using the at least one processor in communication with the digital camera, if the estimated hemoglobin level has other than a desired relationship with the known amount, at least one of the red, green, and blue tissue factors and the red, green, and blue reference factors, respectively. - View Dependent Claims (25)
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Specification