Method for multi-spectral analysis of organic blood analytes in noninvasive infrared spectroscopy
First Claim
1. A method of determining the concentration of an organic blood analyte in a body tissue sample, comprising:
- (a) selecting a plurality of distinct, nonoverlapping spectral regions within an infrared spectrum, wherein each of the spectral regions encompass a range of wavelengths between approximately 1100 and 5000 nanometers, and wherein at least a portion of each spectral region has high correlation to the concentration of the analyte;
(b) irradiating the sample with light having a wavelength in each spectral region to obtain radiation reflected from and modified by contact with the sample in each spectral region;
(c) optically filtering the reflected modified radiation to isolate or emphasize a portion of the radiation from each spectral region;
(d) collecting and measuring the intensity of the optically filtered radiation using a detector means; and
(e) obtaining a value indicative of the analyte concentration by applying a mathematical model to the optically filtered radiation.
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Abstract
A method is described for determining the concentration of an organic blood analyte using multi-spectral analysis in the near infrared and mid-infrared ranges. Incident radiation containing a plurality of distinct, nonoverlapping regions of wavelengths in the range of approximately 1100 to 5000 nm is used to scan a sample. Diffusively reflected radiation emerging from the sample is detected, and a value indicative of the concentration of the analyte is obtained using an application of chemometrics techniques. Information obtained from each nonoverlapping region of wavelengths can be cross-correlated in order to remove background interferences.
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Citations
16 Claims
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1. A method of determining the concentration of an organic blood analyte in a body tissue sample, comprising:
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(a) selecting a plurality of distinct, nonoverlapping spectral regions within an infrared spectrum, wherein each of the spectral regions encompass a range of wavelengths between approximately 1100 and 5000 nanometers, and wherein at least a portion of each spectral region has high correlation to the concentration of the analyte;
(b) irradiating the sample with light having a wavelength in each spectral region to obtain radiation reflected from and modified by contact with the sample in each spectral region;
(c) optically filtering the reflected modified radiation to isolate or emphasize a portion of the radiation from each spectral region;
(d) collecting and measuring the intensity of the optically filtered radiation using a detector means; and
(e) obtaining a value indicative of the analyte concentration by applying a mathematical model to the optically filtered radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of determining the concentration of an organic blood analyte in a body tissue sample, comprising:
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(a) selecting a plurality of distinct, nonoverlapping spectral regions within an infrared spectrum, wherein each of the spectral regions encompass a range of wavelengths between approximately 1100 and 5000 nanometers, and wherein at least a portion of each spectral region has high correlation to the concentration of the analyte;
(b) irradiating the sample with incident light having a wavelength in each spectral region to obtain radiation reflected from and attenuated by contact with the sample and radiation unattenuated by contact with the sample, wherein the attenuated radiation is contained within each spectral region;
(c) collecting the reflected attenuated radiation;
(d) measuring the intensity of the collected reflected attenuated radiation at a predetermined wavelength in each of the spectral regions; and
(e) correlating the intensity measurements obtained in step (d) to determine a value indicative of the concentration of the analyte. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification