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near-infrared spectroscopy cerebral oximetry: A monitoring technique used to measure the oxygen saturation levels in the brains of patients, commonly in operating room and neonatal intensive care unit settings. The technique, which is based on the Beer-Lambert law, involves the emission of near-infrared light from a probe placed on the patient's forehead and the detection of changes in that light's intensity as it is absorbed by the chromophores oxyhemoglobin, deoxyhemoglobin and cytochrome oxidase in brain tissue.

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