Tissue chromophore measurement system
First Claim
1. A measurement system for determining a relative concentration of a first form of a chromophore in a tissue sample, said chromophore comprising at least a first form and a second form, comprising:
- (a) means for irradiating said tissue sample with light at a plurality of wavelengths within a wavelength range within which the first and second forms of the chromophore provide an overlapping spectral response, such that spectral data is emitted from said tissue;
(b) means for detecting the spectral data emitted from said tissue;
(c) means for determining a first 2d derivative spectrum value of the spectral data at a first wavelength within said wavelength range at which the first 2d derivative spectrum value varies with the relative concentration of the first form of the chromophore;
(d) means for determining a second 2d derivative spectrum value of the spectral data at a second wavelength within said wavelength range at which the first 2d derivative spectrum value varies with the relative concentration of the first form of the chromophore;
(e) means for deriving a scaled, 2d derivative spectrum value from information comprising the first and second 2d derivative spectrum values; and
(f) means for storing a correlation which provides the relative chromophore concentration as a function of the scaled, 2d derivative spectrum value; and
(g) means for determining the relative concentration of the first form of the chromophore in the tissue sample from information comprising the scaled, 2d derivative spectrum value and the correlation.
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Abstract
A measurement system and method for measuring a relative concentration of a first form of a chromophore having a first form and a second form. The method comprises irradiating a tissue sample with light at a plurality of wavelengths within a wavelength range within which the first and second forms of the chromophore provide an overlapping spectral response. A detector is provided that detects spectral data emitted from the tissue. Furthermore, the method comprises determining a first and a second 2d derivative spectrum value, at first and second wavelengths, respectively, within said wavelength range at which the first 2d derivative spectrum value varies with the relative concentration of the first form of the chromophore. A scaled, 2d derivative spectrum value is derived from the first and second 2d derivative spectrum values. A memory stores a correlation which provides the relative chromophore concentration as a function of the scaled, 2d derivative spectrum value. Finally, the relative concentration of the first form of the chromophore in the tissue sample is determined from the 2d derivative spectrum values and the correlation.
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Citations
68 Claims
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1. A measurement system for determining a relative concentration of a first form of a chromophore in a tissue sample, said chromophore comprising at least a first form and a second form, comprising:
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(a) means for irradiating said tissue sample with light at a plurality of wavelengths within a wavelength range within which the first and second forms of the chromophore provide an overlapping spectral response, such that spectral data is emitted from said tissue; (b) means for detecting the spectral data emitted from said tissue; (c) means for determining a first 2d derivative spectrum value of the spectral data at a first wavelength within said wavelength range at which the first 2d derivative spectrum value varies with the relative concentration of the first form of the chromophore; (d) means for determining a second 2d derivative spectrum value of the spectral data at a second wavelength within said wavelength range at which the first 2d derivative spectrum value varies with the relative concentration of the first form of the chromophore; (e) means for deriving a scaled, 2d derivative spectrum value from information comprising the first and second 2d derivative spectrum values; and (f) means for storing a correlation which provides the relative chromophore concentration as a function of the scaled, 2d derivative spectrum value; and (g) means for determining the relative concentration of the first form of the chromophore in the tissue sample from information comprising the scaled, 2d derivative spectrum value and the correlation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 41)
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16. A method of measuring a relative concentration of a first form of a chromophore in a tissue sample, said chromophore comprising at least a first form and a second form, comprising the steps of:
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(a) obtaining spectral data for said tissue sample over a plurality of wavelengths within a wavelength range within which the first and second forms of the chromophore provide an overlapping spectral response to irradiation with spectroscopic radiation; (b) determining a first 2d derivative spectrum value of the spectral data at a first wavelength within said wavelength range at which the first 2d derivative spectrum value varies with the relative concentration of the first form of the chromophore; (c) determining a second 2d derivative spectrum value of the spectral data at a second wavelength within said wavelength range at which the first 2d derivative spectrum value varies with the relative concentration of the first for-m of the chromophore; (d) deriving a scaled, 2d derivative spectrum value from information comprising the first and second 2d derivative spectrum values; (e) determining the relative concentration of the first form of the chromophore in the tissue sample from information comprising the scaled, 2d derivative spectrum value and a correlation which provides the relative concentration of the first form of the chromophore as a function of the scaled, 2d derivative spectrum value. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 42, 43, 44, 45, 46)
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47. A system for measuring a relative concentration of a first form of a chromophore in a tissue sample, said chromophore comprising at least a first form and a second form, comprising:
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(a) a memory comprising data representative of a correlation which provides the relative concentration of the first form of the chromophore as a function of a scaled, 2d derivative spectrum value input, wherein the scaled second derivative value input is derived from a spectral response obtained from the tissue sample at a plurality of wavelengths within a wavelength range from 600 nm to 900 nm; (b) a light source assembly for generating spectroscopic radiation for irradiating the tissue sample; (c) a spectroscopic detector for detecting the spectral response emitted by the tissue sample responsive to irradiation with the spectroscopic radiation; and (d) a control system interfaced with the memory and the spectroscopic detector such that; the control system generates the scaled, second derivative spectrum value of the tissue sample from information comprising the spectral response of the tissue sample; and (ii) the control system generates information representative of the relative concentration of the first form of the chromophore in the tissue sample from information comprising the scaled, second derivative spectrum value and the correlation provided in the memory. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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Specification