Continuous monitoring of tumor hypoxia using near-infrared spectroscopy and tomography with a photonic mixer device
First Claim
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1. A method for continuous monitoring of tumor hypoxia, the method comprising:
- illuminating a tissue region having a tumor with an amplitude modulated near-infrared light source provided in close proximity to the tumor;
recording light reflected from the tissue region using a multi-pixel PMD camera chip provided in close proximity to the tumor, wherein the near-infrared light source is horizontally separated from the PMD camera chip;
measuring amplitude and phase shift of the reflected light;
calculating absorption and reduced scattering coefficients using the amplitude and phase shift of the reflected light;
repeating steps a-d for at least two different wavelengths of light; and
calculating the concentrations of oxygenated and deoxygenated hemoglobin in the tissue region using the absorption and reduced scattering coefficients calculated for the at least two different wavelengths of light.
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Abstract
A device and a method to measure the concentrations of oxygenated and deoxygenated hemoglobin in tissue around a tumor via near-infrared (NIR) spectroscopy with a photonic mixer device (PMD) is described.
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12 Claims
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1. A method for continuous monitoring of tumor hypoxia, the method comprising:
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illuminating a tissue region having a tumor with an amplitude modulated near-infrared light source provided in close proximity to the tumor; recording light reflected from the tissue region using a multi-pixel PMD camera chip provided in close proximity to the tumor, wherein the near-infrared light source is horizontally separated from the PMD camera chip; measuring amplitude and phase shift of the reflected light; calculating absorption and reduced scattering coefficients using the amplitude and phase shift of the reflected light; repeating steps a-d for at least two different wavelengths of light; and calculating the concentrations of oxygenated and deoxygenated hemoglobin in the tissue region using the absorption and reduced scattering coefficients calculated for the at least two different wavelengths of light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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